The AD621 is an easy to use, low cost, low power, high accuracy instrumentation amplifier that is ideally suited for a wide range of applications.
The AD621 is an easy‑to‑use, low‑cost instrumentation amplifier designed for high accuracy in applications such as weigh scales and transducer interfaces. It provides pin‑strappable gains of 10 and 100, low supply current (1.3 mA max) and a wide supply range (+2.3 V to +18 V). The device is available in 8‑lead plastic DIP, SOIC and Cerdip packages.
The datasheet lists detailed electrical specifications, including a typical gain error of 0.15 %, input voltage noise of 9 nV/√Hz at 1 kHz, and a bandwidth of 800 kHz (gain = 10). Absolute maximum ratings, ordering information, grounding recommendations, and mechanical dimensions are also provided.
| Gain Error | 0.15 % (typical) |
|---|---|
| Input Voltage Noise | 9 nV/√Hz at 1 kHz |
| Supply Current | 1.3 mA max |
| Bandwidth (Gain = 10) | 800 kHz |
| Total Voltage Offset | 125 µV typical |
| Input Bias Current | 1.5 nA max |
| Package Options | 8‑lead DIP, SOIC, Cerdip |
The AD621 provides selectable gains of 10 and 100 that are set by external pin strapping.
The device draws a maximum of 1.3 mA supply current.
The AD621 exhibits an input voltage noise of 9 nV/√Hz at 1 kHz.