JPS6449322A - A/d and d/a converting circuit - Google Patents
A/d and d/a converting circuitInfo
- Publication number
- JPS6449322A JPS6449322A JP20504387A JP20504387A JPS6449322A JP S6449322 A JPS6449322 A JP S6449322A JP 20504387 A JP20504387 A JP 20504387A JP 20504387 A JP20504387 A JP 20504387A JP S6449322 A JPS6449322 A JP S6449322A
- Authority
- JP
- Japan
- Prior art keywords
- converting
- mode
- turned
- output
- convertor
- 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
Links
Landscapes
- Analogue/Digital Conversion (AREA)
Abstract
PURPOSE:To widely reduce a circuit scale and to reduce power consumption by providing a shift register and a counter which can be shared respectively with an A/D convertor and a D/A convertor. CONSTITUTION:A current voltage converting circuit 104 is grounded by a non- inverted input and composed of an operational amplifier 104a in which a feedback resistance 105 is connected between an inverted input and an output. An input switch S11 is controlled by a mode signal inputted to a control input terminal 106, turned on with an A/D converting mode and turned off with a D/A converting mode. An aperture switch S16 is controlled by the mode signal inputted to a control input terminal 118, turned off with the A/D converting mode and turned on for a prescribed time so as to sample only a proper D/A converting value out of an integration output voltage with the D/A converting mode. The output of a mirror integration amplifier 110 is also supplied to a level comparator 119 with the A/D converting mode and compared with prescribed levels V1-V3 here. Thus, the circuit scale can be reduced and the power consumption can be decreased.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20504387A JPS6449322A (en) | 1987-08-20 | 1987-08-20 | A/d and d/a converting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20504387A JPS6449322A (en) | 1987-08-20 | 1987-08-20 | A/d and d/a converting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6449322A true JPS6449322A (en) | 1989-02-23 |
Family
ID=16500502
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20504387A Pending JPS6449322A (en) | 1987-08-20 | 1987-08-20 | A/d and d/a converting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6449322A (en) |
-
1987
- 1987-08-20 JP JP20504387A patent/JPS6449322A/en active Pending
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