AD628 is a high common-mode voltage programmable gain difference amplifier with features such as high common-mode input voltage range, adjustable gain range, excellent AC and DC performance. It is suitable for applications such as high voltage current shunt sensing, programmable logic controllers, analog input front-end signal conditioning, etc.
The AD628 is a precision difference amplifier designed to combine excellent DC performance with high common-mode rejection over a wide range of frequencies. It is capable of converting standard control voltages or currents, such as +5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA, into a single-ended output suitable for single-supply ADCs. The device operates from single and dual supplies and is available in 8-lead SOIC or MSOP packages.
| Gain Range | 0.1 to 100 V/V |
|---|---|
| Operating Temperature Range | -40°C to +85°C |
| Supply Voltage Range (Dual) | ±2.25 V to ±18 V |
| Supply Voltage Range (Single) | 4.5 V to 36 V |
| Input Common-Mode Voltage Range | ±120 V |
| CMRR (DC to 500 Hz) | 75 dB min |
| Offset Voltage (RTI) | ±1.5 mV max |
| Small Signal Bandwidth | 600 kHz |
| Full Power Bandwidth | 5 kHz |
| Slew Rate | 0.3 V/µs |
| Noise Spectral Density (1 kHz) | 300 nV/√Hz |
| Input Impedance (Differential) | 220 kΩ |
| Input Impedance (Common Mode) | 55 kΩ |
| Output Resistance | 10 kΩ |
| Quiescent Current | 1.6 mA |
| Package Options | 8-lead SOIC or MSOP |
The gain range is programmable from 0.1 to 100 V/V.
The device supports a high common-mode input voltage range of ±120 V.
The AD628 operates over the industrial temperature range of −40°C to +85°C.
The minimum Common Mode Rejection Ratio is 75 dB from DC to 500 Hz.