The AD8205 is a single-supply difference amplifier used for amplifying small differential voltages.
The AD8205 is a single‑supply difference amplifier designed for high‑side current‑sensing applications such as motor controls and vehicle dynamics. It offers a fixed gain of 50 V/V, low offset drift (15 µV/°C) and high common‑mode rejection (78 dB up to 20 kHz). The device is available in both SOIC package and die form, with operating temperature ranges up to +150 °C for the die.
The document includes detailed specifications, absolute maximum ratings, pin configuration, typical performance curves, theory of operation, output offset adjustment methods, and example circuits for high‑side current sensing with low‑side and high‑side switches. Ordering information and mechanical dimensions are also provided.
| Gain | 50 V/V |
|---|---|
| Input Offset Voltage (RTI) at 25°C | 2.0 mV |
| Offset Drift | 15 µV/°C |
| Common‑Mode Rejection Ratio | 78 dB (DC to 20 kHz) |
| Supply Voltage Range | 4.5 V to 10 V (absolute max 12.5 V) |
| Quiescent Current | 2 mA |
| Power Supply Rejection Ratio | 70 dB |
| Operating Temperature Range (packaged) | -40°C to +125°C |
| Operating Temperature Range (die) | -40°C to +150°C |
The AD8205 provides a fixed gain of 50 V/V.
The output offset can be set between 0.05 V and 4.8 V (with a 5 V supply) by applying voltages to the Vrerl and Vrer2 pins.
The absolute maximum supply voltage is 12.5 V.