CN208094531U - A kind of high-speed multiple channel high-precision AD DA conversion circuits - Google Patents
A kind of high-speed multiple channel high-precision AD DA conversion circuits Download PDFInfo
- Publication number
- CN208094531U CN208094531U CN201820376375.1U CN201820376375U CN208094531U CN 208094531 U CN208094531 U CN 208094531U CN 201820376375 U CN201820376375 U CN 201820376375U CN 208094531 U CN208094531 U CN 208094531U
- Authority
- CN
- China
- Prior art keywords
- converter
- channel
- resistance
- operational amplifier
- pins
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Analogue/Digital Conversion (AREA)
Abstract
The utility model provides a kind of high-speed multiple channel high-precision AD DA conversion circuits, including microcontroller, D/A converter, AD converter, operational amplifier U4, U5, upper limit reference voltage setting potentiometer VR1, resistance R2, R3, the channel 5 of resistance R1, operational amplifier U4 and AD converter constitute the digital calibration channel of D/A converter；The full scale that upper limit reference voltage sets the composition AD converter of channel 6 of potentiometer VR1, resistance R2, operational amplifier U5 and AD converter exports upper limit number calibrated channel；The channel 7 of resistance R3 and AD converter constitutes the 0V bottoming digital calibrations channel of AD converter.This AD/DA conversion circuits realize high-speed multiple channel high-precision conversion function, can be used for needing observing and controlling and the monitoring field of high-speed multiple channel high-precision AD and DA conversions by compensating calibration to 16 8 Channel A/D Converters of 16 8 channel D/A converters of high speed and high speed.
Description
Technical field
The present invention relates to circuit design field more particularly to a kind of high-speed multiple channel high-precision AD/DA conversion circuits.
Background technology
It is limited by process matching performance, 16 D/A converters of bottom device that technique provides can only achieve 12 phases
To precision.In high-precision D/A converter, when not using collimation technique, DNL is usually only capable of reaching 12 essences below
Degree.In order to reach real 16 DNL DC precisions, it is necessary to be calibrated.In actual use, digital school is not passed through
The transformation result of accurate AD converter is compared with actual value, and application condition is big, and maximum can reach 9% or so, such data,
The higher occasion of required precision, cannot bring direct use；The main reason for ADC conversion accuracies are poor be there are gain error and partially
Shift error, to improve conversion accuracy must just compensate both errors；It is corrected in terms of hardware and software two,
The conversion accuracy of AD conversion device is can effectively improve, and is realized control errors 0.1% or so.Therefore, research and development one kind can
To compensate calibration, realize that high-speed multiple channel high-precision AD/DA conversion circuits are a urgent problems to be solved.
Invention content
The invention solves the above technical problems, provide a kind of high-speed multiple channel high-precision AD/DA conversion circuits, realize high
Fast multi-channel high-accuracy conversion function can be used for needing observing and controlling and the monitoring field of high-speed multiple channel high-precision AD and DA conversions.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of high-speed multiple channel high-precision AD/DA conversion circuits, including microcontroller U1, D/A converter U2, AD converter
U3, operational amplifier U4, operational amplifier U5, upper limit reference voltage setting potentiometer VR1, resistance R1, resistance R2 and resistance R3,
The microcontroller U1 is connected with D/A converter U2 and AD converter U3 respectively, and the resistance R1, operational amplifier U4 and AD turn
The channel 5 of parallel operation U3 forms the digital calibration channel of D/A converter U2；Upper limit reference voltage set potentiometer VR1, resistance R2,
The full scale that the channel 6 of operational amplifier U5 and AD converter U3 forms AD converter U3 exports upper limit number calibrated channel；Resistance
The channel 7 of R3 and AD converter U3 forms the 0V bottoming digital calibrations channel of AD converter U3.Above three digital calibration
Channel calibration is completed in channel by corresponding software.
Further, the ports MOSI of the microcontroller U1 turn with the SDI pins of the D/A converter U2, AD respectively
The DIN pins of parallel operation U3 are connected, the ports SCILK of microcontroller U1 SCK pins, the AD with the D/A converter U2 respectively
The SCK pins of converter U3 are connected, the ports MISO of the microcontroller U1 respectively with the SDO pins of the D/A converter U2,
The SDO pins of AD converter U3 are connected, the SYNC pins of the ports DAC-CS of the microcontroller U1 and the D/A converter U2
It is connected, the ports ADC-CS of the microcontroller U1 are connected with the CNV pins of the AD converter U3.
Further, the Vout7 pins of the D/A converter U2 are connected with the positive input terminal of operational amplifier U4, the fortune
The negative input end for calculating amplifier U4 is connected by resistance R1 with the output end of operational amplifier U4, and the operational amplifier U4's is defeated
Outlet is also connected with the IN5 pins of AD converter U3.The channel 5 of resistance R1, operational amplifier U4 and AD converter U3 form DA
The digital calibration channel of converter U2.
Further, the positive input terminal of the operational amplifier U5 is connected with the armature contact of potentiometer VR1, the operation
The negative input end of amplifier U5 is connected by resistance R2 with the output end of operational amplifier U5, the output of the operational amplifier U5
End is also connected with the IN6 pins of AD converter U3.Upper limit reference voltage set potentiometer VR1, resistance R2, operational amplifier U5 and
The full scale that the channel 6 of AD converter U3 constitutes AD converter U3 exports upper limit number calibrated channel.
Further, the IN7 pins of the AD converter U3 are grounded by resistance R3.Resistance R3's and AD converter U3
Channel 7 constitutes the 0V bottoming digital calibrations channel of AD converter.
Further, the service aisle connection driving circuit of the D/A converter U2 output ends and respective electric load,
Load end accesses voltage, current sampling device, and after the conditioned processing of circuit of sampled signal, the input for being sent into AD converter U3 is logical
Road can realize quick, the accurate observing and controlling to load voltage and electric current by microcontroller U1.
Further, the model C8051F021 of the microcontroller U1, the model of the D/A converter U2
The model AD7689, the operational amplifier U4 of AD5676R, the AD converter U3, the model of operational amplifier U5 are
ADA4841。
Further, it is 20K Ω that the resistance value of the resistance R1, which is the resistance value of 20K Ω, the resistance R1, the resistance R3's
Resistance value is 20K Ω.
A kind of calibration method using above-mentioned high-speed multiple channel high-precision AD/DA conversion circuits, process are：Turned by AD
The output voltage in mono- channel parallel operation U3 readback D/A converter U2, makes comparisons with the output valve of program setting, obtains calibration factor；
Calibration factor is recycled to carry out corresponding compensation to all channels of D/A converter U2 by program；AD converter U3 passes through to itself
External 0V reference voltages and full scale reference voltage is sampled, and calibration factor is obtained；Calibration factor is recycled to pass through program pair
All channels of AD converter U3 carry out corresponding compensation.
The invention has the advantages and positive effects that：This AD/DA conversion circuits are acquired using D/A converter output signal
Processing and calibration procedure and AD converter input signal acquisition process and calibration procedure etc., by turning to 16 8 channel DA of high speed
16 8 Channel A/D Converters of parallel operation and high speed compensate calibration, realize high speed, multichannel, high-precision AD and DA conversion functions；
Have the characteristics that compensation precision is high, circuit structure is simple, be easily achieved.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the circuit diagram of the present invention.
Specific implementation mode
Specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.It should be noted that in the feelings not conflicted
Under condition, the feature in embodiment and embodiment in the present invention can be combined with each other.
As shown in Figure 1, a kind of high-speed multiple channel high-precision AD/DA conversion circuits, including microcontroller U1,16 8 channels
High speed D/A converter U2,16 8 channel speed A/D converter U3, low-power consumption, low noise operational amplifier U4, operational amplifiers
U5, upper limit reference voltage setting potentiometer VR1, resistance R1, resistance R2 and 0V reference voltage input resistance R3.The microcontroller
The ports MOSI of device U1 are connected with the DIN pins of the SDI pins of the D/A converter U2, AD converter U3 respectively, the micro-control
The ports SCILK of device U1 processed are connected with the SCK pins of the SCK pins of the D/A converter U2, AD converter U3 respectively, described
The ports MISO of microcontroller U1 are connected with the SDO pins of the SDO pins of the D/A converter U2, AD converter U3 respectively, institute
The ports DAC-CS for stating microcontroller U1 are connected with the SYNC pins of the D/A converter U2, the ADC-CS of the microcontroller U1
Port is connected with the CNV pins of the AD converter U3.The Vout7 pins and operational amplifier U4 of the D/A converter U2 is just
Input terminal is connected, and the negative input end of the operational amplifier U4 is connected by resistance R1 with the output end of operational amplifier U4, institute
The output end for stating operational amplifier U4 is also connected with the IN5 pins of AD converter U3.Resistance R1, operational amplifier U4 and AD turn
The channel 5 of parallel operation U3 forms the digital calibration channel of D/A converter U2.The positive input terminal and potentiometer of the operational amplifier U5
The armature contact of VR1 is connected, the output that the negative input end of the operational amplifier U5 passes through resistance R2 and operational amplifier U5
End is connected, and the output end of the operational amplifier U5 is also connected with the IN6 pins of AD converter U3.Upper limit reference voltage setting electricity
The full scale of the composition AD converter U3 of channel 6 of position device VR1, resistance R2, operational amplifier U5 and AD converter U3 export upper limit number
Word calibrated channel.The IN7 pins of the AD converter U3 are grounded by resistance R3.7 structure of channel of resistance R3 and AD converter U3
At the 0V bottoming digital calibrations channel of AD converter.Three hardware corridors complete channel calibration by corresponding software.
The model AD5676R, the AD of the model C8051F021, the D/A converter U2 of the microcontroller U1
The model AD7689, the operational amplifier U4 of converter U3, the model of operational amplifier U5 are ADA4841.The electricity
It is the resistance value of 20K Ω, the resistance R3 is 20K Ω that the resistance value of resistance R1, which is the resistance value of 20K Ω, the resistance R1,.It needs to illustrate
It is only to change the calibrated channel of D/A converter and AD converter to number, and use circuit structure same as the present invention, identical
Parameter configuration, identical device model etc. all should be considered as present invention invention protection determined by the appended claims
Range.
The course of work of the present embodiment：Driving circuit and respective electric are connected in the service aisle of D/A converter U2 output ends
Load is sent into AD converter U3's after load end access voltage, current sampling device, the conditioned processing of circuit of sampled signal
Input channel can realize quick, the accurate observing and controlling to load voltage and electric current by microcontroller U1.Meanwhile being by changing
Application program in system software is accurately measured, it can be achieved that the various analog quantitys from different sensors；It constitutes such as
High speed, high precision monitor or the telemetry circuit of the physical quantitys such as temperature, pressure, flow.
The calibration method of the present embodiment is：Pass through mono- channel AD converter AD7689 readback D/A converters AD5676R
Output voltage is made comparisons with the output valve of program setting, obtains calibration factor, and calibration factor is recycled to be converted to DA by program
All channels of device carry out corresponding compensation；AD converter AD7689 passes through to itself external 0V reference voltage and full scale reference
Voltage is sampled, and calibration factor is obtained, and calibration factor is recycled to be corresponded to all channels of AD converter by program
Compensation.
The embodiments of the present invention have been described in detail above, but content is only the preferred embodiment of the present invention,
It should not be construed as limiting the practical range of the present invention.All changes and improvements made in accordance with the scope of the present invention, should all
It still belongs within this patent covering scope.
Claims (8)
1. a kind of high-speed multiple channel high-precision AD DA conversion circuits, it is characterised in that：Including microcontroller U1, D/A converter U2,
AD converter U3, operational amplifier U4, operational amplifier U5, upper limit reference voltage setting potentiometer VR1, resistance R1, resistance R2
It is connected respectively with D/A converter U2 and AD converter U3 with resistance R3, the microcontroller U1, the resistance R1, operational amplifier
The channel 5 of U4 and AD converter U3 forms the digital calibration channel of D/A converter U2；Upper limit reference voltage setting potentiometer VR1,
The full scale output upper limit digital calibration that the channel 6 of resistance R2, operational amplifier U5 and AD converter U3 form AD converter U3 is logical
Road；The channel 7 of resistance R3 and AD converter U3 forms the 0V bottoming digital calibrations channel of AD converter U3.
2. a kind of high-speed multiple channel high-precision AD DA conversion circuits according to claim 1, it is characterised in that：The micro-control
The ports MOSI of device U1 processed are connected with the DIN pins of the SDI pins of the D/A converter U2, AD converter U3 respectively, described micro-
The ports SCILK of controller U1 are connected with the SCK pins of the SCK pins of the D/A converter U2, AD converter U3 respectively, described
The ports MISO of microcontroller U1 are connected with the SDO pins of the SDO pins of the D/A converter U2, AD converter U3 respectively, institute
The ports DAC-CS for stating microcontroller U1 are connected with the SYNC pins of the D/A converter U2, the ADC-CS of the microcontroller U1
Port is connected with the CNV pins of the AD converter U3.
3. a kind of high-speed multiple channel high-precision AD DA conversion circuits according to claim 1 or 2, it is characterised in that：It is described
The Vout7 pins of D/A converter U2 are connected with the positive input terminal of operational amplifier U4, the negative input end of the operational amplifier U4
It is connected with the output end of operational amplifier U4 by resistance R1, the output end of the operational amplifier U4 is also with AD converter U3's
IN5 pins are connected, and the digital calibration of the composition D/A converter U2 of channel 5 of resistance R1, operational amplifier U4 and AD converter U3 are logical
Road.
4. a kind of high-speed multiple channel high-precision AD DA conversion circuits according to claim 3, it is characterised in that：The operation
The positive input terminal of amplifier U5 is connected with the armature contact of potentiometer VR1, and the negative input end of the operational amplifier U5 passes through electricity
Resistance R2 is connected with the output end of operational amplifier U5, and the output end of the operational amplifier U5 is also managed with the IN6 of AD converter U3
Foot is connected, and the channel 6 that upper limit reference voltage sets potentiometer VR1, resistance R2, operational amplifier U5 and AD converter U3 constitutes AD
The full scale of converter U3 exports upper limit number calibrated channel.
5. a kind of high-speed multiple channel high-precision AD DA conversion circuits according to claim 4, it is characterised in that：The AD turns
The IN7 pins of parallel operation U3 are grounded by resistance R3, under the 0V outputs of the composition AD converter of channel 7 of resistance R3 and AD converter U3
Limit digital calibration channel.
6. a kind of high-speed multiple channel high-precision AD DA conversion circuits according to claim 5, it is characterised in that：The DA turns
The service aisle connection driving circuit of parallel operation U2 output ends and respective electric load access voltage, current sampler in load end
Part after the conditioned processing of circuit of sampled signal, is sent into the input channel of AD converter U3, is realized to load by microcontroller U1
The observing and controlling of voltage and electric current.
7. a kind of high-speed multiple channel high-precision AD DA conversion circuits according to claim 1, it is characterised in that：The micro-control
The model AD5676R of the model C8051F021, the D/A converter U2 of device U1 processed, the model of the AD converter U3
AD7689, the operational amplifier U4, operational amplifier U5 model be ADA4841.
8. a kind of high-speed multiple channel high-precision AD DA conversion circuits according to claim 1, it is characterised in that：The resistance
It is the resistance value of 20K Ω, the resistance R3 is 20K Ω that the resistance value of R1, which is the resistance value of 20K Ω, the resistance R1,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820376375.1U CN208094531U (en) | 2018-03-20 | 2018-03-20 | A kind of high-speed multiple channel high-precision AD DA conversion circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820376375.1U CN208094531U (en) | 2018-03-20 | 2018-03-20 | A kind of high-speed multiple channel high-precision AD DA conversion circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208094531U true CN208094531U (en) | 2018-11-13 |
Family
ID=64059800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820376375.1U Expired - Fee Related CN208094531U (en) | 2018-03-20 | 2018-03-20 | A kind of high-speed multiple channel high-precision AD DA conversion circuits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208094531U (en) |
-
2018
- 2018-03-20 CN CN201820376375.1U patent/CN208094531U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204155439U (en) | A kind of multi-channel high-accuracy data acquisition unit | |
| CN106918795B (en) | Precision resister calibration system based on FPGA and the resistance calibrating method using system realization | |
| CN104360165A (en) | Multichannel resistance measuring device | |
| CN112730970B (en) | Isolated high-precision wide-range voltage measurement system and measurement method | |
| CN105973509A (en) | Pressure transducer circuit and commissioning method thereof | |
| CN106950002A (en) | A kind of Flush Airdata Sensing System | |
| CN109870618A (en) | A kind of multipolar resolver detection device and control method | |
| CN103412600A (en) | Field programmable gate array (FPGA) based numerically-controlled direct-current constant current source | |
| CN202231703U (en) | Self-calibration circuit of digital to analog conversion output voltage | |
| CN208094531U (en) | A kind of high-speed multiple channel high-precision AD DA conversion circuits | |
| CN110032126B (en) | Multichannel strain signal synchronous acquisition system and method | |
| CN102541117B (en) | Multipath temperature control device for ion mobility spectrometer | |
| CN106443117A (en) | Program-controlled multi-range acquisition circuit | |
| CN105548714A (en) | Missile-borne resistor adaptive measurement device on barrel missile and method | |
| CN202229770U (en) | Digital compensation device for analog quantity acquisition circuit | |
| CN210119521U (en) | Multichannel differential sampling system and battery charging equipment | |
| CN110018337B (en) | Bidirectional sampling circuit, sampling method and testing method thereof | |
| CN107094017A (en) | A kind of Sensing interface system of multipurpose super low-power consumption | |
| CN103616919B (en) | Wheatstone bridge configuration and adjustment method thereof | |
| CN209821627U (en) | Multichannel strain signal synchronous acquisition system | |
| CN203287119U (en) | Temperature-sensitive circuit and integrated CMOS temperature sensor | |
| CN202393815U (en) | Multi-channel high-voltage low-current detection circuit | |
| CN207677696U (en) | A kind of programmable gain amplifier | |
| CN208060600U (en) | A kind of integrator circuit applying to Rogowski coil signal processing | |
| CN201926940U (en) | Multi-path temperature control device for ion migration spectrometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181113 Termination date: 20200320 |