AD629: High Common-Mode Voltage, Difference Amplifier
The AD629 is a difference amplifier with a very high input, common-mode voltage range. It is a precision device that allows the user to accurately measure differential signals in the presence of ...More
AD629: High Common-Mode Voltage, Difference Amplifier
Product Description
The AD629 is a difference amplifier with a very high input, common-mode voltage range. It is a precision device that allows the user to accurately measure differential signals in the presence of high common-mode voltages up to ±270 V.
The AD629 can replace costly isolation amplifiers in applications that do not require galvanic isolation. The device operates over a ±270 V common-mode voltage range and has inputs that are protected from common-mode or differential mode transients up to ±500 V.
The AD629 has low offset, low offset drift, low gain error drift, low common-mode rejection drift, and excellent CMRR over a wide frequency range.
The AD629 is available in low cost, 8-lead PDIP and 8-lead SOIC packages. For all packages and grades, performance is guaranteed over the industrial temperature range of −40°C to +85°C.
Applications
Data Sheet, Rev. B, 2/07
Features
- Improved replacement for: INA117P and INA117KU
- ±270 V common-mode voltage range
- Input protection to
- ±500 V common mode
- ±500 V differential mode
Wide power supply range (±2.5 V to ±18 V)
±10 V output swing on ±12 V supply
1 mA maximum power supply current - ±500 V common mode
- HIGH ACCURACY DC PERFORMANCE
3 ppm maximum gain nonlinearity (AD629B)
20 μV/°C maximum offset drift (AD629A)
10 μV/°C maximum offset drift (AD629B)
10 ppm/°C maximum gain drift - EXCELLENT AC SPECIFICATIONS
77 dB minimum CMRR @ 500 Hz (AD629A)
86 dB minimum CMRR @ 500 Hz (AD629B)
500 kHz bandwidth
Specifications
| Single/Dual Supply | Dual |
| Voltage Supply (Vmax) | ±18V |
| Gain Setting Method | fixed |
| Gain Range (min to max) | 1 |
| Bandwidth G=10 (kHz typ) | 500kHz |
| CMRR (dB) | 77dB |
| Vnoise RTI 1-10 Hz µVp-p | 15µV p-p |
| Temperature Range | -40 to +85 |
| Gain Error (%) max | +0.01% |
| Supply Current (max) | 1mA |
| Package | DIP,SOIC |
| Vosi (µV) | 1000µV |
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| Part# | Description | Single/Dual Supply | Vcc-Vee | Gain Setting Method | Bandwidth G=10 (kHz typ) | Gain min. | Gain max. | Min CMRR @ 60 Hz Min Gain | Min CMRR @ 60Hz Max Gain | Vnoise RTI 1-10 Hz µVp-p | Price* (1000-4999) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AD522 | Diff Amp | Dual | 10V to 36V | Resistor | 3 | 1 | 1,000 | 75dB | 100dB | 4 | - |
| AD524 | Precision IA | Dual | 12V to 36V | Pin | 400 | 1 | 1,000 | 70dB | 110dB | 0.3 | $9.52 |
| AD526 | Software Programmable | Dual | 9V to 33V | Software | 350 | 1 | 16 | - | - | 3 | $6.39 |
| AD620 | General Purpose IA | Dual | 4.6V to 36V | Resistor | 800 | 1 | 10,000 | 73dB | 110dB | 0.28 | $3.18 |
| AD621 | Precision IA | Dual | 4.6V to 18V | Pin | 800 | 10 | 100 | 93dB | 110dB | 0.28 | $4.09 |
| AD622 | Low Cost IA | Dual | 5.2V to 36V | Resistor | 800 | 1 | 1,000 | 66dB | 103dB | 0.3 | $2.51 |
| AD623 | S.S R-R IA | Single/Dual | 2.7V to 12V | Resistor | 100 | 1 | 1,000 | 70dB | 105dB | 2 | $1.40 |
| AD624 | Precision IA | Dual | 12V to 36V | Pin | 400 | 1 | 1,000 | 70dB | 110dB | 0.3 | $11.93 |
| AD625 | Programmable Gain IA | Dual | 12V to 36V | Resistor | 400 | 1 | 10,000 | 70dB | 110dB | 0.3 | $8.78 |
| AD626 | Diff Amp | Single/Dual | 2.4V to 12V | Pin | 100 | 10 | 100 | 55dB | 55dB | 2 | $3.70 |
| AD627 | Micropower IA | Single/Dual | 2.2V to 36V | Resistor | 30 | 5 | 1,000 | 77dB | 77dB | 1.2 | $2.56 |
| AD628 | High CMV DA | Single/Dual | 4.5V to 36V | Pin, Resistor | 600 | 0.1 | 100 |