CN208459545U - A kind of test substrate suitable for plurality of specifications crystal oscillator - Google Patents
A kind of test substrate suitable for plurality of specifications crystal oscillator Download PDFInfo
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- CN208459545U CN208459545U CN201820897503.7U CN201820897503U CN208459545U CN 208459545 U CN208459545 U CN 208459545U CN 201820897503 U CN201820897503 U CN 201820897503U CN 208459545 U CN208459545 U CN 208459545U
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Abstract
The utility model discloses a kind of test substrates suitable for plurality of specifications crystal oscillator, including power supply base, the accessory power outlet for exporting the source signal of crystal oscillator to be measured, the test jack of electrical connection corresponding with the test contact pin of test plate, and the test circuit of the test substrate back is set.Wherein test jack is corresponding with test three test pin groups of substrate respectively, multiple terminals in these test jacks are electrically connected with the input/output terminal of multiple modules in test circuit and control terminal, the connection control planning that these terminals in test circuit can be changed by being correspondingly connected with the test pin groups on test plate, enables adaptation to the test plate of different powered types.The test substrate provides a unified power supply platform for the test plate of a variety of powered types, is convenient for plurality of specifications crystal oscillator power-on test.
Description
Technical field
The utility model belongs to crystal oscillator detection technique field, more particularly to a kind of test suitable for plurality of specifications crystal oscillator
Substrate.
Background technique
Crystal oscillator is the abbreviation of crystal oscillator, refers to and cuts thin slice (referred to as by certain azimuth from one piece of quartz crystal
For chip), the crystal element of IC composition oscillating circuit is added inside encapsulation, which generally uses packed by metal casing, also have
It is encapsulated with glass shell, ceramics or plastics.Therefore, different crystal oscillators usually has a different specifications, including volume size specification,
Supply voltage specification etc..
When the crystal oscillator power-on test to different powered types, need for the crystal oscillator to be plugged on a corresponding test plate
On, the test plate of each powered types can power class with the crystal oscillator of a variety of different specification sizes of grafting there are many
When the test plate of type, then a public test substrate is needed, provides a unified power supply platform with this.
Utility model content
The utility model is fitted mainly solving the technical problems that providing a kind of test plate to a variety of powered types
Test substrate solves the problems, such as that these test plates share the same power supply platform.
In order to solve the above technical problems, the technical solution adopted in the utility model, which is to provide one kind, is suitable for plurality of specifications crystalline substance
The test substrate of vibration, the power supply base for being used to access external dc voltage including the test substrate front side is arranged in, output
The accessory power outlet of the source signal of crystal oscillator to be measured, the test jack of electrical connection corresponding with the test contact pin of test plate, and setting
In the test circuit of the test substrate back；The test circuit includes power filtering module, and external dc voltage passes through institute
Two-way is exported after stating power filtering module, wherein the first via is straight-through is used as high voltage channel, switch electricity of second tunnel by concatenation
Source module and LC accumulator are as low-voltage channel；The test jack includes that there is the first test of double 12 jack to insert
Seat, the second test jack of double 10 jack and double 4 jack third test jack, the test plate is corresponding including double
The first test pin groups, the third test pin groups of the second test pin groups of double 10 jack and double 4 contact pin of 12 contact pins；
First test jack includes high voltage input terminal, is electrically connected with the output end in the high voltage channel；Low-voltage input terminal,
It is electrically connected with the output end in the low-voltage channel；Voltage common terminal is electrically connected with the input terminal for connecting linear power supply module；It is logical
Corresponding first test pin groups on the test plate are crossed to be electrically connected the high voltage input terminal with the voltage common terminal,
Or the low-voltage input terminal is electrically connected with the voltage common terminal；The linear power supply module carries out the voltage of input
Linear partial pressure obtains the supply voltage for the crystal oscillator to be measured being plugged on the test plate.
In the utility model suitable for another embodiment of the test substrate of plurality of specifications crystal oscillator, the external dc electricity
Pressure is 15V, and the power filtering module includes power filter chip BNX025H01L, the output end of the power filter chip
For by the DC voltage 15V of voltage regulation filtering, the power input of the power filter chip passes through power switch and described outer
The anode of portion's DC voltage is connected, and is additionally provided with anti-reverse diode at the external dc voltage both ends, defeated in the power supply
Enter and is also serially connected with light emitting diode and current-limiting resistance between end and input grounding end, after power switch closure, the hair
Optical diode is lighted, and indicates that the external dc voltage has accessed, and the output end of the power filter chip is defeated to rear stage
Pass through the DC voltage of voltage regulation filtering out, three output ground terminals are altogether.
In the utility model suitable for another embodiment of the test substrate of plurality of specifications crystal oscillator, the third test is inserted
4 jacks of seat include Switching Power Supply control terminal and corresponding ground terminal, and low pressure selects end and corresponding ground terminal, by described
Corresponding third test pin groups are hanging by the Switching Power Supply control terminal on test plate or are grounded, and the low pressure is selected end
Hanging or ground connection；The switch power module includes switching power source chip TPS54327, the end VIN of the switching power source chip with
The output end of the power filter chip BNX025H01L is electrically connected, and on the one hand the end EN connects the Switching Power Supply control terminal, separately
On the one hand it is also electrically connected by the first enabled resistance with the end VIN, when Switching Power Supply control terminal is hanging, the end EN passes through
The first enabled resistance obtains enable signal and the switching power source chip TPS54327 is worked, when Switching Power Supply control
When end processed is electrically connected with corresponding ground terminal, then the switching power source chip TPS54327 does not work；The switching power source chip
The end VBST of TPS54327 is electrically connected by capacitor with the end SW, and the end SW concatenates the first outputting inductance, the first output electricity
The other end output switch power source output voltage of sense；The switch power source output voltage is further by partial pressure RC network tune
Control, the partial pressure RC network includes the first divider resistance for connecting the switch power source output voltage, first divider resistance
The other end connect the end VFB of the switching power source chip TPS54327, be also parallel at the both ends of first divider resistance
First derided capacitors, the end VFB also pass through the second divider resistance, third divider resistance and the 4th divider resistance being sequentially connected in series
And be grounded, it is also electrically connected with low pressure selection end between the third divider resistance and the 4th divider resistance, and in institute
State power filter chip BNX025H01L output voltage be 15V when, when the low pressure selection end ground connection when, the Switching Power Supply
Output voltage is 6.6V, and when low pressure selection end is hanging, the switch power source output voltage is 4.8V.
In the utility model suitable for another embodiment of the test substrate of plurality of specifications crystal oscillator, the first output electricity
The switch power source output voltage of sense output is input to the LC accumulator, and the LC accumulator includes 4 in parallel
Polarity free capacitor and the energy storage inductor being electrically connected with first outputting inductance, one end of the polarity free capacitor with it is described
First outputting inductance and energy storage inductor electrical connection, the other end of the polarity free capacitor are grounded, the both ends of the energy storage inductor
It is electrically connected respectively with the anode of 2 polar capacitors, the cathode of the polar capacitor is grounded.
In the utility model suitable for another embodiment of the test substrate of plurality of specifications crystal oscillator, second test is inserted
Seat includes linear power supply enable end and corresponding ground terminal, and the first partial pressure control terminal and corresponding ground terminal, the second partial pressure control
End and corresponding ground terminal, it is by the test plate corresponding second test pin groups that the linear power supply enable end is hanging
Or it is grounded, divides control terminal vacantly for described first or is grounded, divide control terminal vacantly for described second or be grounded；It is described linear
Power module includes linear power supply chip LM1085, and the end IN of the linear power supply chip is described with first test jack
Voltage common terminal electrical connection, the end ADJ connect the collector of a triode, the emitter ground connection of the triode, base stage connection
First enabled resistance, the other end of the first enabled resistance connect the second enabled resistance, the other end of the second enabled resistance also with institute
State the first test jack the voltage common terminal electrical connection, between the described first enabled resistance and the second enabled resistance with institute
State the electrical connection of linear power supply enable end；When the linear power supply enable end is hanging, the triode ON, the chip
The end ADJ of LM1085 is grounded, and corresponding OUT terminal is reference voltage output；It is described when linear power supply enable end ground connection
Triode cut-off, the end ADJ of the chip LM1085 is earth-free, the partial pressure value of corresponding OUT terminal output controllable resistor network；Institute
Stating controllable resistor network includes the first linear divider resistance and the end ADJ and institute between the end ADJ and the OUT terminal
It states and is in series with the second linear divider resistance, third linear divider resistance, the 4th linear divider resistance, the 5th between ground terminal linearly
Divider resistance, the 6th linear divider resistance, and between the third linear divider resistance and the 4th linear divider resistance with
The first partial pressure control terminal electrical connection, with described the between the 5th linear divider resistance and the 6th linear divider resistance
Two partial pressure control terminal electrical connections；When the IN of the linear power supply chip is terminated into 15V, the first partial pressure control terminal and second
It is hanging to divide control terminal, the OUT terminal exports 12V voltage；It is described when the IN of the linear power supply chip is terminated into 6.6V
First partial pressure control terminal is hanging, and the second partial pressure control terminal ground connection, the OUT terminal exports 5V voltage；When the linear power supply chip
IN when terminating into 4.8V, the first partial pressure control terminal ground connection, the second partial pressure control terminal is hanging, and the OUT terminal exports 3.3V
Voltage.
In the utility model suitable for another embodiment of the test substrate of plurality of specifications crystal oscillator, second test is inserted
Seat includes source signal incoming end and corresponding ground terminal, tests pin groups for the source by the test plate corresponding second
Signal incoming end is electrically connected or is grounded with the signal output pin for the crystal oscillator to be measured being plugged on the test plate；The survey
Examination circuit further includes the Buffer output module buffered to the source signal of crystal oscillator to be measured output, and the Buffer output module includes
Chip BUF602ID and voltage stabilizing chip 78L10, the input terminal of the pressure stabilizing 78L10 and the power filter chip BNX025H01L
Output end electrical connection, the output end of the pressure stabilizing 78L10 inputs 10V direct current to the power end of the chip BUF602ID
Pressure, the negative power end ground connection of the chip BUF602ID, the source signal incoming end access crystal oscillator to be measured by partiting dc capacitor
Signal output pin, and signal output end then pass through concatenation resistance and capacitor export Jing Guo buffered crystal oscillator output believe
Number.
In the utility model suitable for another embodiment of the test substrate of plurality of specifications crystal oscillator, second test is inserted
Seat further includes the crystal oscillator voltage end for being electrically connected with the OUT terminal of the linear power supply chip LM1085 and be crystal oscillator to be measured power supply, is led to
Corresponding second test pin groups on the test plate are crossed to be electrically connected the crystal oscillator voltage end with the feeder ear of crystal oscillator to be measured；
First test jack further includes 12V voltage end, 5V voltage end and 3.3V voltage end, and these three voltage ends pass through respectively
The voltage indication light diode and current-limiting resistance of concatenation and be grounded, pass through on the test plate it is corresponding first test contact pin
The 12V voltage end, 5V voltage end or 3.3V voltage end are electrically connected by group with the crystal oscillator voltage end, then corresponding voltage refers to
Show that light emitting diode is lighted.
The beneficial effects of the utility model are: the utility model discloses a kind of test bases suitable for plurality of specifications crystal oscillator
Plate, including power supply base export the accessory power outlet of the source signal of crystal oscillator to be measured, electrical connection corresponding with the test test contact pin of plate
Test jack, and be arranged in it is described test substrate back test circuit.Wherein test jack respectively with test substrate
Three test pin groups are corresponding, and multiple terminals in these test jacks and the input of multiple modules in test circuit are defeated
Outlet and control terminal electrical connection can change these in test circuit by being correspondingly connected with the test pin groups on test plate
The connection control planning of terminals enables adaptation to the test plate of different powered types.The test substrate is a variety of power supplies
The test plate of type provides a unified power supply platform, is convenient for plurality of specifications crystal oscillator power-on test.
Detailed description of the invention
Fig. 1 is the positive composition schematic diagram for test one embodiment of substrate that the utility model is suitable for plurality of specifications crystal oscillator；
Fig. 2 is the back side composition schematic diagram of embodiment illustrated in fig. 1；
Fig. 3 is the first test jack wiring of test one embodiment of substrate that the utility model is suitable for plurality of specifications crystal oscillator
Hold schematic diagram；
Fig. 4 is the power filtering module circuit for test one embodiment of substrate that the utility model is suitable for plurality of specifications crystal oscillator
Composition schematic diagram；
Fig. 5 is the third test jack wiring for test one embodiment of substrate that the utility model is suitable for plurality of specifications crystal oscillator
Hold schematic diagram；
Fig. 6 is the switch power module and LC for test one embodiment of substrate that the utility model is suitable for plurality of specifications crystal oscillator
Accumulator composition schematic diagram；
Fig. 7 is the second test jack wiring of test one embodiment of substrate that the utility model is suitable for plurality of specifications crystal oscillator
Hold schematic diagram；
Fig. 8 is the linear power supply module circuit for test one embodiment of substrate that the utility model is suitable for plurality of specifications crystal oscillator
Composition schematic diagram；
Fig. 9 is the Buffer output modular circuit for test one embodiment of substrate that the utility model is suitable for plurality of specifications crystal oscillator
Composition schematic diagram.
Specific embodiment
For the ease of understanding the utility model, in the following with reference to the drawings and specific embodiments, the utility model is carried out more detailed
Thin explanation.The preferred embodiment of the utility model is given in attached drawing.But the utility model can be with many different
Form is realized, however it is not limited to this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to this
The understanding of the disclosure of utility model is more thorough and comprehensive.
It should be noted that unless otherwise defined, all technical and scientific terms used in this specification with belong to
The normally understood meaning of those skilled in the art of the utility model is identical.In the used in the description of the utility model
Term be only for the purpose of describing specific embodiments be not intended to limitation the utility model.
With reference to the accompanying drawing, each embodiment of the utility model is described in detail.Fig. 1 and Fig. 2 is the utility model
The composition schematic diagram of test one embodiment of substrate suitable for plurality of specifications crystal oscillator.As shown in Figure 1, the test substrate includes setting
It is positive for accessing the power supply base 11 of external dc voltage in the test substrate 1, export the source signal of crystal oscillator to be measured
Accessory power outlet 12, the test jack 13 of electrical connection corresponding with the test contact pin of test plate, and be arranged in the test substrate
The test circuit at the back side.Fig. 1 also shows voltage indication light diode 20.As shown in Fig. 2, the test circuit includes electricity
Source filter module 14, external dc voltage is by being input to the power filter by power switch 18 after the power supply base 11
Two-way is exported after module 14, wherein the first via is straight-through is used as high voltage channel, switch power module 15 of second tunnel by concatenation
It is used as low-voltage channel and linear power supply module 17 with LC accumulator 16, the input terminal of the linear power supply module 17 passes through
The first following test jacks 131 selects the output end of the output end or low-voltage channel in high voltage channel.In addition, Fig. 1
In also show a circular opening 21, which is used to hold the nut cap of cylindrical type, which is surveying for covering
The crystal oscillator of examination guarantees that crystal oscillator, not by external environmental interference, such as prevents wind etc. in test.
Further, as shown in Figure 1, the test jack 13 includes have the first test jack 131 of double 12 jack,
Second test jack 132 of double 10 jack and the third test jack 133 of double 4 jack, the test plate correspondence include
The third test of the first test pin groups, the second test pin groups of double 10 jack and double 4 contact pin of double 12 contact pin is inserted
Needle group.
Further, in conjunction with shown in Fig. 2 and Fig. 3, first test jack 131 includes the (packet of high voltage input terminal 1311
Include two jacks side by side), it is electrically connected with the output end in the high voltage channel；Low-voltage input terminal 1312 (including two simultaneously
The jack of row), it is electrically connected with the output end in the low-voltage channel；Voltage common terminal 1313 (including two jacks side by side),
It is electrically connected with the input terminal for connecting linear power supply module.As seen from Figure 3, it is inputted due to voltage common terminal 1313 between high voltage
Between end 1311 and low-voltage input terminal 1312, being also convenient for voltage common terminal 1313 in this way, even an input terminal is selected with this,
Such as it is selected by jumper cap.Preferably, can also test pin groups by the test plate corresponding first will
The high voltage input terminal is electrically connected with the voltage common terminal, or by the low-voltage input terminal and the voltage common terminal
Electrical connection；The linear power supply module obtains being plugged on to be measured on the test plate to the linear partial pressure of voltage progress of input
The supply voltage of crystal oscillator.
As can be seen that providing public test circuit on test substrate by the utility model embodiment, and pass through
Test jack can be connected to the different terminals of test jack to the voltage of test circuit output, then further according to the test jack pair
The connection relationship for the pin groups on test plate answered is different and determines the relationship that is correspondingly connected in these test jacks, in this way
Different power supply power supplies only can be realized by the electric connecting relation of the contact pin on change test plate.
Further, the external dc voltage is 15V, as shown in figure 4, the power filtering module includes power filter
Chip BNX025H01L, the output end of the power filter chip are the DC voltage 15V by voltage regulation filtering, the chip 101
Power input B be connected with the anode of external dc voltage by power switch SW1 (i.e. the corresponding power switch 18 of Fig. 1),
It is additionally provided with the anti-reverse diode of 11D1 at external dc voltage both ends, the polarity of voltage of external dc voltage is prevented to be reversely connected.?
It is also serially connected with light emitting diode 11D2 and current-limiting resistance 11R1 between power input B and input grounding end PSG, when SW1 is closed
Afterwards, light emitting diode 11D2 is lighted, and indicates that external voltage has accessed.Output end CB after the module filtered is to rear stage
The DC voltage of voltage regulation filtering is passed through in output.Three output ground terminal CG are altogether.
As shown in figure 5,4 jacks of the third test jack include Switching Power Supply control terminal 1331 and corresponding connect
Ground terminal 1333, low pressure select end 1332 and corresponding ground terminal 1333, are tested and are inserted by third corresponding on the test plate
Needle group is hanging by the Switching Power Supply control terminal 1331 or is grounded, and selects end 1332 hanging or ground connection the low pressure.
Preferably, switch power module includes chip TPS54327.As shown in fig. 6, the end VIN of the chip 102 and Fig. 4 institute
The end the HV electrical connection shown, the end also pass through polar capacitor 12E1 and polarity free capacitor 12C1 ground connection, and the end SS is connect by capacitor 12C2
Ground, VREGS are grounded by capacitor 12C3, and the end CG is directly grounded, and the end VBST is electrically connected by capacitor 12C4 with the end SW, the end SW string
Connect the first outputting inductance 12L1, the other end output switch power source output voltage of the first outputting inductance 12L1, switch electricity
Source output voltage is the output voltage of the switch power module 12, it can be seen that the switch power source output voltage is also divided
RC network, i.e. the 4th divider resistance 12R2 are to the first divider resistance 12R5 and the first derided capacitors 12C5 RC network formed
Regulation.
In addition, on the one hand the end EN of the chip 12 directly meets Switching Power Supply control terminal SWEN, on the other hand also pass through first
Enabled resistance 12R1 is electrically connected with the end VIN.When Switching Power Supply control terminal SWEN is hanging, the end EN passes through the first enabled resistance 12R1
Available enable signal and work, when Switching Power Supply control terminal SWEN ground connection when, then the chip 12 will no longer work.
Further, the partial pressure RC network includes the first divider resistance for connecting the switch power source output voltage
The other end of 12R5, the first divider resistance 12R5 connect the end VFB of the switching power source chip TPS54327, described
The both ends of one divider resistance 12R5 are also parallel with the first derided capacitors 12C5, and the end VFB also passes through second point be sequentially connected in series
Piezoresistance 12R4, third divider resistance 12R3 and the 4th divider resistance 12R2 and be grounded, in the third divider resistance 12R3 and
Low pressure selection end SWVIG is further connected between 4th divider resistance 12R2, and defeated in the power filter chip BNX025H01L
When voltage is 15V out, when low pressure selection end SWVIG ground connection, the switch power source output voltage is 6.6V, switch electricity
The calculation method of source output voltage is: Vout=0.765 × (1+12R5/ (12R3+12R4)).When the low pressure selects end
When SWVIG is hanging, the switch power source output voltage is 4.8V.Also, the calculation method of the switch power source output voltage is:
Vout=0.765 × (1+12R5/ (12R2+12R3+12R4)).
Preferably, divider resistance 12R5=143k Ω, 12R4=18k Ω, 12R3=510 Ω, 12R2=8.2k Ω.It is aobvious
So, when SWVIG is grounded, Vout=0.765 × (1+143/ (18+0.51))=6.675V, approximate above-mentioned 6.6V and in error
Within；When SWVIG is hanging, Vout=0.765 × (1+143/ (18+0.51+8.2))=4.86V, approximate above-mentioned 4.8V is simultaneously
Within error.
Therefore, it can be seen that the switch power module as low-pressure channel, on the one hand can pass through Switching Power Supply control terminal
SWEN controls whether the module has voltage output, can select end SWVIG by low pressure on the other hand to control module tool
The output voltage values of body, suitable supply voltage to can targetedly be selected by being conducive to rear stage linear power supply module in this way
On the other hand the crystal oscillator of different size has the problems such as saving energy consumption, reducing current supply loss and fever.
Further, the switch power source output voltage of the output of the first outputting inductance 12L1 described in Fig. 6 is input to institute
State LC accumulator, the LC accumulator includes 4 polarity free capacitor 13C1 to 13C4 in parallel, and with it is described first defeated
The energy storage inductor 13L1 of inductance 12L1 electrical connection, one end of the polarity free capacitor 13C1 to 13C4 are exported with described first out
Inductance 12L1 and energy storage inductor 13L1 electrical connection, the other end of the polarity free capacitor 13C1 to 13C4 are grounded, the energy storage
The both ends of inductance 13L1 are electrically connected with the anode of 2 polar capacitors 13E1,13E2 respectively, described polar capacitor 13E1,13E2's
Cathode is grounded.Accumulator 13 in the LC accumulator corresponding diagram 1, the power supply that mainly switch power module 12 is exported
Signal is stored, and guarantees that the power supply after powering off of stablizing and be unlikely to occur of rear stage supply voltage is interrupted suddenly, to rear stage
Circuit is powered protection.
Output voltage can effectively be adjusted by the LC accumulator after switching power source chip TPS54327, mainly
The on-off ratio (duty ratio) of output is adjusted by the switching tube of quick on-off in switching power source chip TPS54327 to control
The average value of DC voltage is exported, such as after the switching tube in switching power source chip TPS54327 is connected, to the first output electricity
Electrification sense 12L1 and energy storage inductor 13L1 charge to energy storage inductor 13L1 to rear stage load supplying, and simultaneously, the energy storage inductor
13L1 is equivalent to constant-current source, plays the role of quickly transmitting energy, and polar capacitor 13E2 is equivalent to constant pressure source, plays filter in circuit
Wave effect, and after the switching tube in switching power source chip TPS54327 turns off, the energy of energy storage inductor 13L1 storage passes through pole
Property capacitor 13E1 forming circuit, rear stage load is continued to power, to ensure that load obtains continuous electric current.
Further, as shown in fig. 7, second test jack includes linear power supply enable end 1321 and corresponding connects
Ground terminal 1324, the first partial pressure control terminal 1322 and corresponding ground terminal 1324, the second partial pressure control terminal 1323 and corresponding ground connection
End 1324 vacantly or is connect the linear power supply enable end 1321 by the corresponding third test pin groups of the test plate
Ground divides control terminal 1321 vacantly for described first or is grounded, and divides control terminal 1321 vacantly for described second or is grounded.
Preferably, linear power supply includes chip LM1085.As shown in figure 8, in the end IN of the linear power supply chip and Fig. 3
The first test jack voltage common terminal 1313 be electrically connected, be denoted herein as the end MV.The end MV is an input terminal, when the end with
MV terminates the high voltage of the end HV output shown in Fig. 4, such as 15V after high voltage input terminal electrical connection in Fig. 1；When the end MV and figure
After low-voltage input terminal electrical connection in 1, MV terminates the low-voltage of the end LV output shown in fig. 6, such as 6.6V or 4.8V.
The end ADJ connects the collector of a triode 15Q1, the emitter ground connection of the triode 15Q1, base stage connection the
The other end of one enabled resistance 15R2, the first enabled resistance 15R2 connect the second enabled resistance 15R1, the second enabled resistance 15R1
The other end be also electrically connected with the end public output MV of the first test jack, in the enabled electricity of the described first enabled resistance and second
The linear power supply enable end end LVEN is connected between resistance.
When the linear power supply enable end LVEN is hanging, the triode 15Q1 conducting, the ADJ of the chip LM1085
End ground connection, corresponding OUT terminal are reference voltage output；When linear power supply enable end LVEN ground connection, the triode
15Q1 cut-off, the end ADJ of the chip LM1085 is earth-free, the partial pressure value of corresponding OUT terminal output controllable resistor network.
The controllable resistor network includes the first linear divider resistance 15R3 between the end ADJ and the OUT terminal, and
The second linear divider resistance 15R4, third linear divider resistance 15R5, the 4th are in series between the end ADJ and the ground terminal
Linear divider resistance 15R6, the 5th linear divider resistance 15R7, the 6th linear divider resistance 15R8, and in the third linear
The first partial pressure control terminal LVO3 is provided between the linear divider resistance 15R6 of divider resistance 15R5 and the 4th, it is linear the described 5th
The second partial pressure control terminal LVO5 is provided between the linear divider resistance 15R8 of divider resistance 15R7 and the 6th；
When the IN of the linear power supply chip is terminated into 15V, the first partial pressure control terminal LVO3 and the second partial pressure control
End LVO5 processed is hanging, and the OUT terminal exports 12V voltage, and the method for calculating OUT terminal output voltage is: Vlout=1.25 × (1
+ (15R4+15R5+15R6+15R7+15R8)/15R3)；When the IN of the linear power supply chip is terminated into 6.6V, described
One partial pressure control terminal LVO3 is hanging, and the second partial pressure control terminal LVO5 ground connection, the OUT terminal exports 5V voltage, it is defeated to calculate OUT terminal
The method of voltage is out: Vlout=1.25 × (1+ (15R4+15R5+15R6+15R7)/15R3)；When the linear power supply chip
IN when terminating into 4.8V, the first partial pressure control terminal LVO3 ground connection, the second partial pressure control terminal LVO5 is hanging, the OUT terminal
3.3V voltage is exported, the method for calculating the end OUT output voltage is: Vlout=1.25 × (1+ (15R4+15R5)/15R3).This
In it should be noted that calculation method and the input voltage of the output voltage of OUT terminal as being not directly dependent upon, effectively as
Linear power supply chip its mainly be exactly output voltage is obtained by electric resistance partial pressure to input voltage, if output voltage relative to
When the partial pressure of input voltage is smaller, there will be biggish losses, such as 3.3V to be significantly less than relative to the intrinsic standoff ratio of input 15V
Intrinsic standoff ratio of the 3.3V relative to input 4.8V.In order to improve the power supply efficiency of power supply, elder generation is respectively adopted for 5V and 3.3V here
Obtain corresponding 6.6V and 4.8V by switch power module, then again by linear power supply module obtain corresponding 5V and
3.3V, switch power module efficiency with higher, and higher intrinsic standoff ratio can be also obtained in linear power supply module, thus whole
It is upper that there is high efficiency.In addition linear power supply module has more preferable ripple characteristics, therefore is to use line to the power supply that crystal oscillator is directly powered
Property power module, rather than directly use switch power module, this also for guarantee crystal oscillator supply voltage stabilization, obtain more
Add accurate measuring condition.
Further, 15R3=100 Ω, 15R4=82 Ω, 15R5=82 Ω, 15R6=100 Ω, 15R7=36 Ω,
15R8=560 Ω.It is 12V, 5V and 3.3V that above-mentioned OUT terminal output voltage, which can be respectively obtained,.
Further, as shown in fig. 7, second test jack includes source signal incoming end 1325 and corresponding ground connection
End 1324 by the source signal incoming end and is plugged on the test by the corresponding second test pin groups of the test plate
The signal output pin of crystal oscillator to be measured on plate is electrically connected or ground connection.
As shown in Figure 1, the test circuit further includes the Buffer output buffered to the source signal of crystal oscillator to be measured output
Module 19, the Buffer output module include chip BUF602ID and voltage stabilizing chip 78L10, the input terminal of the pressure stabilizing 78L10
It is electrically connected with the output end of the power filter chip BNX025H01L, the output end of the pressure stabilizing 78L10 is to the chip
The power end of BUF602ID inputs 10V DC voltage, as shown in figure 9, the power end VCC of chip BUF602ID meets 10V, the 10V
Voltage is to be electrically connected to export stable 10V voltage after voltage stabilizing chip 78L10 by the end HV of aforementioned power source filter module.Negative supply
End-VCC is directly grounded, and signal input part IN accesses the source signal S20 from crystal oscillator to be measured by partiting dc capacitor C161, and defeated
The resistance R161 and capacitor C164 that outlet OUT then passes through concatenation export the crystal oscillator output signal S21 Jing Guo buffered.
Interface Matching and isolation can be carried out for rear stage by Buffer output module, ensure that the reliability of test.Tool
It is because crystal oscillator has the characteristic of load regulation, the load for exactly testing crystal oscillator output signal connects and do not connect can shadow for body
The output frequency for ringing it is equivalent to increase by the Buffer output module to guarantee the stability or consistency of output frequency
One matched load, and the matched load also has the characteristic of high resistance input and low resistance output, be also convenient for it is latter
Grade connection.Also, after having the Buffer output module, no matter connecing load below does not still connect the output that load does not affect crystal oscillator
Thus frequency avoids the risk of the variation by the variation bring crystal oscillator output frequency loaded.
Further, as shown in fig. 7, second test jack further includes and the linear power supply chip LM1085
The crystal oscillator voltage end 1326 OUT terminal electrical connection and powered for crystal oscillator to be measured passes through corresponding second test on the test plate
The crystal oscillator voltage end 1326 is electrically connected by pin groups with the feeder ear of crystal oscillator to be measured.
Further, first test jack further includes 12V voltage end 1314,5V voltage end 1315 and 3.3V voltage end
1316, and these three voltage ends pass through voltage indication light diode (the voltage indication light two as shown in Figure 1 of concatenation respectively
Pole pipe 20) and current-limiting resistance and be grounded, by the first test pin groups corresponding on the test plate by the 12V voltage
End, 5V voltage end or 3.3V voltage end are electrically connected with the crystal oscillator voltage end, then corresponding voltage indication light diode is lighted.
The utility model discloses a kind of test substrate suitable for plurality of specifications crystal oscillator, including power supply base, output to
The accessory power outlet for surveying the source signal of crystal oscillator, the test jack of electrical connection corresponding with the test contact pin of test plate, and setting exist
The test circuit of the test substrate back.Wherein test jack is corresponding with test three test pin groups of substrate respectively,
Multiple terminals in these test jacks are electrically connected with the input/output terminal of multiple modules in test circuit and control terminal, are led to
The connection control planning for being correspondingly connected with the test pin groups on test plate and capable of changing these terminals in test circuit is crossed,
Enable adaptation to the test plate of different powered types.The test substrate provides one for the test plate of a variety of powered types
Unified power supply platform is convenient for plurality of specifications crystal oscillator power-on test.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure transformation made based on the specification and figures of the utility model, it is relevant to be applied directly or indirectly in other
Technical field is included in the scope of patent protection of the utility model.
Claims (7)
1. a kind of test substrate suitable for plurality of specifications crystal oscillator, which is characterized in that the test substrate includes being arranged described
The power supply base for being used to access external dc voltage of test substrate front side, exports the accessory power outlet of the source signal of crystal oscillator to be measured,
The test jack of electrical connection corresponding with the test contact pin of test plate, and the test electricity of the test substrate back is set
Road；
The test circuit includes power filtering module, and external dc voltage exports two-way after the power filtering module,
Wherein the first via is straight-through is used as high voltage channel, and switch power module and LC accumulator of second tunnel by concatenation are as low electricity
Pressure passageway；
The test jack includes first test jack with double 12 jack, the second test jack of double 10 jack and double
The third test jack of 4 jacks is arranged, corresponding the first test pin groups including double 12 contact pin of the test plate, double 10 are inserted
Second test pin groups of needle and the third of double 4 contact pin test pin groups；
First test jack includes high voltage input terminal, is electrically connected with the output end in the high voltage channel；Low-voltage is defeated
Enter end, is electrically connected with the output end in the low-voltage channel；Voltage common terminal is electrically connected with the input terminal for connecting linear power supply module
It connects；It is by the first test pin groups corresponding on the test plate that the high voltage input terminal and the voltage common terminal is electric
Connection, or the low-voltage input terminal is electrically connected with the voltage common terminal；Electricity of the linear power supply module to input
Line is pressed into divide to obtain the supply voltage for the crystal oscillator to be measured being plugged on the test plate.
2. the test substrate according to claim 1 suitable for plurality of specifications crystal oscillator, which is characterized in that the external dc
Voltage is 15V, and the power filtering module includes power filter chip BNX025H01L, the output end of the power filter chip
For by the DC voltage 15V of voltage regulation filtering, the power input of the power filter chip passes through power switch and described outer
The anode of portion's DC voltage is connected, and is additionally provided with anti-reverse diode at the external dc voltage both ends, defeated in the power supply
Enter and is also serially connected with light emitting diode and current-limiting resistance between end and input grounding end, after power switch closure, the hair
Optical diode is lighted, and indicates that the external dc voltage has accessed, and the output end of the power filter chip is defeated to rear stage
Filtered DC voltage out, three output ground terminals are altogether.
3. the test substrate according to claim 2 suitable for plurality of specifications crystal oscillator, which is characterized in that the third test
4 jacks of socket include Switching Power Supply control terminal and corresponding ground terminal, and low pressure selects end and corresponding ground terminal, passes through institute
Corresponding third test pin groups are stated on test plate by the Switching Power Supply control terminal is hanging or ground connection, the low pressure is selected
End is hanging or is grounded；
The switch power module includes switching power source chip TPS54327, the end VIN of the switching power source chip and the electricity
The output end of source filtering chip BNX025H01L is electrically connected, on the one hand the end EN connects the Switching Power Supply control terminal, on the other hand
It is also electrically connected with the end VIN by the first enabled resistance, when Switching Power Supply control terminal is hanging, the end EN passes through described the
One enabled resistance obtains enable signal and the switching power source chip TPS54327 is worked, when Switching Power Supply control terminal with it is right
When the ground terminal electrical connection answered, then the switching power source chip TPS54327 does not work；
The end VBST of the switching power source chip TPS54327 is electrically connected by capacitor with the end SW, first output of the end SW concatenation
Inductance, the other end output switch power source output voltage of first outputting inductance；
For the switch power source output voltage further by partial pressure RC network regulation, the partial pressure RC network includes described in connection
The other end of first divider resistance of switch power source output voltage, first divider resistance connects the switching power source chip
The end VFB of TPS54327 is also parallel with the first derided capacitors at the both ends of first divider resistance, and the end VFB also passes through
The second divider resistance, third divider resistance and the 4th divider resistance that are sequentially connected in series and be grounded, in the third divider resistance and
It is also electrically connected with low pressure selection end between 4th divider resistance, and is exported in the power filter chip BNX025H01L
When voltage is 15V, when low pressure selection end ground connection, the switch power source output voltage is 6.6V, when the low pressure selects
When holding hanging, the switch power source output voltage is 4.8V.
4. the test substrate according to claim 3 suitable for plurality of specifications crystal oscillator, which is characterized in that first output
The switch power source output voltage of inductance output is input to the LC accumulator, and the LC accumulator includes 4 parallel connections
Polarity free capacitor and the energy storage inductor that is electrically connected with first outputting inductance, one end of the polarity free capacitor is and institute
The first outputting inductance and energy storage inductor electrical connection are stated, the other end of the polarity free capacitor is grounded, and the two of the energy storage inductor
End is electrically connected with the anode of 2 polar capacitors respectively, and the cathode of the polar capacitor is grounded.
5. the test substrate according to claim 4 suitable for plurality of specifications crystal oscillator, which is characterized in that second test
Socket includes linear power supply enable end and corresponding ground terminal, and the first partial pressure control terminal and corresponding ground terminal, the second partial pressure are controlled
End processed and corresponding ground terminal are hanged the linear power supply enable end by the corresponding second test pin groups of the test plate
Sky is grounded, and is divided control terminal vacantly for described first or is grounded, and is divided control terminal vacantly for described second or is grounded；
The linear power supply module includes linear power supply chip LM1085, and the end IN of the linear power supply chip and described first are surveyed
The voltage common terminal electrical connection of socket is tried, the end ADJ connects the collector of a triode, and the emitter of the triode connects
Ground, base stage connect the first enabled resistance, and the other end of the first enabled resistance connects the second enabled resistance, the second enabled resistance it is another
One end is also electrically connected with the voltage common terminal of first test jack, in the described first enabled resistance and the second enabled electricity
It is electrically connected between resistance with the linear power supply enable end；
When the linear power supply enable end is hanging, the triode ON, the end the ADJ ground connection of the chip LM1085 is corresponded to
OUT terminal be reference voltage output；When linear power supply enable end ground connection, the triode cut-off, the chip
The end ADJ of LM1085 is earth-free, the partial pressure value of corresponding OUT terminal output controllable resistor network；
The controllable resistor network includes the first linear divider resistance and the ADJ between the end ADJ and the OUT terminal
The second linear divider resistance, third linear divider resistance, the 4th linear divider resistance, the are in series between end and the ground terminal
Five linear divider resistances, the 6th linear divider resistance, and in the third linear divider resistance and the 4th linear divider resistance
Between with it is described first partial pressure control terminal be electrically connected, between the 5th linear divider resistance and the 6th linear divider resistance and
The second partial pressure control terminal electrical connection；
When the IN of the linear power supply chip is terminated into 15V, the first partial pressure control terminal and the second partial pressure control terminal are outstanding
Sky, the OUT terminal export 12V voltage；When the IN of the linear power supply chip is terminated into 6.6V, the first partial pressure control terminal
Vacantly, the second partial pressure control terminal ground connection, the OUT terminal export 5V voltage；When the IN of the linear power supply chip is terminated into 4.8V
When, the first partial pressure control terminal ground connection, the second partial pressure control terminal is hanging, and the OUT terminal exports 3.3V voltage.
6. the test substrate according to claim 5 suitable for plurality of specifications crystal oscillator, which is characterized in that second test
Socket includes source signal incoming end and corresponding ground terminal, and testing pin groups by the test plate corresponding second will be described
Source signal incoming end is electrically connected or is grounded with the signal output pin for the crystal oscillator to be measured being plugged on the test plate；
The test circuit further includes the Buffer output module buffered to the source signal of crystal oscillator to be measured output, and the buffering is defeated
Module includes chip BUF602ID and voltage stabilizing chip 78L10 out, the input terminal of the pressure stabilizing 78L10 and the power filter chip
The output end of BNX025H01L is electrically connected, and the output end of the pressure stabilizing 78L10 is inputted to the power end of the chip BUF602ID
10V DC voltage, the negative power end ground connection of the chip BUF602ID, the source signal incoming end are accessed by partiting dc capacitor
The signal output pin of crystal oscillator to be measured, and signal output end then passes through the crystalline substance of the resistance and capacitor output of concatenation Jing Guo buffered
Vibration output signal.
7. the test substrate according to claim 6 suitable for plurality of specifications crystal oscillator, which is characterized in that second test
Socket further includes the crystal oscillator voltage end for being electrically connected with the OUT terminal of the linear power supply chip LM1085 and be crystal oscillator to be measured power supply,
The feeder ear of the crystal oscillator voltage end and crystal oscillator to be measured is electrically connected by the second test pin groups corresponding on the test plate
It connects；
First test jack further includes 12V voltage end, 5V voltage end and 3.3V voltage end, and these three voltage ends are distinguished
It is grounded by the voltage indication light diode and current-limiting resistance of concatenation, passes through the first test corresponding on the test plate
The 12V voltage end, 5V voltage end or 3.3V voltage end are electrically connected by pin groups with the crystal oscillator voltage end, then corresponding voltage
Indication light diode is lighted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820897503.7U CN208459545U (en) | 2018-06-11 | 2018-06-11 | A kind of test substrate suitable for plurality of specifications crystal oscillator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820897503.7U CN208459545U (en) | 2018-06-11 | 2018-06-11 | A kind of test substrate suitable for plurality of specifications crystal oscillator |
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| Publication Number | Publication Date |
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| CN208459545U true CN208459545U (en) | 2019-02-01 |
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ID=65159765
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820897503.7U Withdrawn - After Issue CN208459545U (en) | 2018-06-11 | 2018-06-11 | A kind of test substrate suitable for plurality of specifications crystal oscillator |
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| CN (1) | CN208459545U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514900A (en) * | 2019-07-23 | 2019-11-29 | 河北远东通信系统工程有限公司 | Constant-temperature crystal oscillator aging Auto-Test System |
-
2018
- 2018-06-11 CN CN201820897503.7U patent/CN208459545U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514900A (en) * | 2019-07-23 | 2019-11-29 | 河北远东通信系统工程有限公司 | Constant-temperature crystal oscillator aging Auto-Test System |
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