CN1221258A - Compound electric circuit for realizing digital/module conversion - Google Patents
Compound electric circuit for realizing digital/module conversion Download PDFInfo
- Publication number
- CN1221258A CN1221258A CN 97108368 CN97108368A CN1221258A CN 1221258 A CN1221258 A CN 1221258A CN 97108368 CN97108368 CN 97108368 CN 97108368 A CN97108368 A CN 97108368A CN 1221258 A CN1221258 A CN 1221258A
- Authority
- CN
- China
- Prior art keywords
- regulation resistance
- operational amplifier
- digital regulation
- signal
- described digital
- 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.)
- Pending
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- Analogue/Digital Conversion (AREA)
Abstract
A combined circuit for implementing D/A conversion is composed of cascaded three digital potentiometers and following operating amplifier, all of which constitute an incremental output controller to shorten converting time and decrease cost by 3/4-1/2 as compared with D/A converter chip.
Description
The present invention relates to a kind of combinational circuit of realizing D/A switch, it belongs to and is used for data are felt well from the output device that processor is delivered to output equipment.
Mostly adopt special-purpose D/A switch integrated package to realize D/A switch at present,, just adopt the combinational circuit of resistor network or resolution element and integrated operational amplifier only in the not high occasion of required precision.
Purpose of the present invention is to utilize E
2The pot Nonvolatile digital potentiometer can be opened up the new way that realizes D/A switch by the function of the moving point of digital control selection current potential output.
Can go out detailed explanation to technical scheme part of the present invention according to accompanying drawing.As figure, a kind of combinational circuit of D/A switch of realizing comprises integrated operational amplifier N
4: A, N
4: B and N
4: C, its feature: the E that also contains three cascades in the combinational circuit
2Pot Nonvolatile digital potentiometer N
1, N
2, N
3, described digital current device N
1, N
2, N
3With above-mentioned operational amplifier N
4: A, N
4: B and N
4: C has formed the increment type output control circuit; Described digital regulation resistance N
1, N
2, N
3Its Cs signal can be controlled by the decoding output of microprocessor, and its U/D and INC signal can utilize data/address bus through latch output control; Described digital regulation resistance N
1, N
2, N
3Its Cs, U/D, INC signal also all can utilize the I/O port of microprocessor directly to control.
N in the accompanying drawing
1, N
2, N
3That select for use is X9313, also can select X9312 for use; Integrated operational amplifier then should be selected OP07C for use, so that reduce the influence that amplifier is brought to change-over circuit.
This circuit is work like this: A) reset.Promptly before realizing the D/A conversion, should put Cs
*, U/D
*Be low level, and provide serial INC
*Pulse makes the sliding end of each digital regulation resistance slide to minimum point; Putting U/D then is that high level is also given N
1INC
*A pulse makes N
1With N
2Between form the potential difference of a step so that in D/A transfer process subsequently, N
1And N
2INC
*Signal is total to keep synchronously B) D/A conversion.For 10 D/A conversion, high 5 results of data are N
1And N
2INC
*Umber of pulse, low 5 of data is N
3INC
*Umber of pulse; Subsequently D/A conversion can utilize last time the D/A translation data and the difference of this D/A translation data decide N
1, N
2INC
*Pulse number and N
3INC
*Pulse number.
The D/A conversion of 10 precision can be realized with the combinational circuit of 3 X9313 and amplifier, and after using X9313 instead, the D/A conversion of 14 precision can be realized.
Outstanding advantage of the present invention is: compare with the D/A conversion chip of existing same accuracy class, cost of the present invention will reduce by 3/4～1/2; In addition, owing to adopted increment type output control, so also can shorten change-over time, the minimum transition time of circuit of the present invention is 2uS.
Accompanying drawing 1 is the circuit diagram of an embodiment of the present invention.
Claims (2)
1, a kind of combinational circuit of D/A switch of realizing comprises integrated operational amplifier N
4: A, N
4: B and N
4: C is characterized in that: the E that also contains three cascades in the combinational circuit
2POT Nonvolatile digital potentiometer N
1, N
2, N
3, described digital regulation resistance N
1, N
2, N
3With above-mentioned operational amplifier N
4: A, N
4: B, N
4: C has formed the increment type output control circuit; Described digital regulation resistance N
1, N
2, N
3Its CS signal can be controlled by the decoding output of microprocessor, and its U/D and INC signal can utilize data/address bus through lock device output control; Described digital regulation resistance N
1, N
2, N
3Its Cs, U/D, INC signal also all can utilize the I/O port of microprocessor directly to control.
2, according to the combinational circuit of the described realization D/A switch of claim 1, it is characterized in that: described digital regulation resistance N
1, N
2, N
3Select X9313 or X9312 for use, and described integrated operational amplifier N
4: A, N
4: B and N
4: C then adopts high accuracy bipolarity low maladjustment voltage type OP amplifier OPO7C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97108368 CN1221258A (en) | 1997-12-24 | 1997-12-24 | Compound electric circuit for realizing digital/module conversion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97108368 CN1221258A (en) | 1997-12-24 | 1997-12-24 | Compound electric circuit for realizing digital/module conversion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1221258A true CN1221258A (en) | 1999-06-30 |
Family
ID=5170371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97108368 Pending CN1221258A (en) | 1997-12-24 | 1997-12-24 | Compound electric circuit for realizing digital/module conversion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1221258A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568057A (en) * | 2014-12-31 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Echo signal adjusting method and echo signal adjusting device suitable for guided wave radar |
-
1997
- 1997-12-24 CN CN 97108368 patent/CN1221258A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568057A (en) * | 2014-12-31 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Echo signal adjusting method and echo signal adjusting device suitable for guided wave radar |
| CN104568057B (en) * | 2014-12-31 | 2018-08-17 | 重庆川仪自动化股份有限公司 | A kind of echo-signal adjusting method and device suitable for guided wave radar |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |