The document introduces a low-cost, low-power instrumentation amplifier called AD620. The amplifier features easy-to-use gain setting with one external resistor, allowing for a gain range of 1 to 1000. It is suitable for applications such as weigh scales, ECG and medical instrumentation, transducer interface, data acquisition systems, industrial process controls, battery-powered and portable equipment.
The AD620 instrumentation amplifier provides high accuracy with a single external resistor for gain setting. It is offered in 8‑lead PDIP, CERDIP and SOIC packages, making it suitable for battery‑powered and portable applications.
Key features include a gain range of 1‑10 000, low supply current (1.3 mA max), low offset voltage (50 µV max), and low input bias current (1 nA max). The device also offers a wide supply voltage range (+2.3 V to +18 V) and high common‑mode rejection.
| Gain range | 1 to 10,000 |
|---|---|
| Supply current (max) | 1.3 mA |
| Input offset voltage | 50 µV max |
| Input bias current | 1.0 nA max |
| Common‑mode rejection ratio | ≥100 dB (G=10) |
| Bandwidth | 120 kHz (G=100) |
| Supply voltage range | +2.3 V to +18 V |
The AD620 can be set to a gain from 1 up to 10 000 using a single external resistor.
The device draws a maximum of 1.3 mA supply current.
The input offset voltage is specified as 50 µV maximum.
The AD620 operates from +2.3 V up to +18 V.