The AD625 is a precision instrumentation amplifier with programmable gain, low noise, and low offset voltage.
The AD625 is a precision, programmable‑gain instrumentation amplifier offered by Analog Devices. It provides user‑selected gains from 1 to 10,000 (up to 110,000 for the C grade) with low gain error, low noise, and a 25 MHz gain‑bandwidth product. The device is available in several accuracy grades and temperature ranges for industrial, commercial, and extended‑temperature applications.
The datasheet includes full electrical specifications, absolute maximum ratings, ordering information, pin descriptions, theory of operation, input‑protection guidelines, and recommended resistor‑network calculations for software‑programmable gain amplifier (SPGA) configurations.
| Gain range | 1 to 10,000 (up to 110,000 for C grade) |
|---|---|
| Gain error (typical) | 0.02 % max |
| Nonlinearity (gain = 1‑256) | 0.001 % max (C grade) |
| Gain‑bandwidth product | 25 MHz |
| Voltage noise (1 kHz) | 4 nV/√Hz |
| Power supply range | +6 V to +18 V |
| Quiescent current | 3.5 mA to 5 mA |
| Temperature range (grades) | A/B/C: –40 °C to +85 °C; J/K: 0 °C to +70 °C; S: –55 °C to +125 °C |
The AD625 supports gains from 1 to 10,000, and the C‑grade version can reach up to 110,000.
A, B, and C grades operate from –40 °C to +85 °C; J and K grades from 0 °C to +70 °C; the S grade from –55 °C to +125 °C.
The AD625 exhibits a voltage noise of 4 nV/√Hz at 1 kHz.
The device draws between 3.5 mA and 5 mA of quiescent current.