The AD8655/AD8656 is a low noise, high precision CMOS amplifier with 2.7 nV/√Hz noise, 250 μV offset voltage, 0.4 μV/°C offset voltage drift, 28 MHz bandwidth, 2.7 V to 5.5 V operating voltage range, -40°C to +125°C operating temperature range.
The AD8655 and AD8656 are precision CMOS amplifiers that provide ultra‑low noise (2.7 nV/√Hz at 10 kHz) and extremely low offset voltage (250 pV max). They feature rail‑to‑rail input and output, operate from 2.7 V to 5.5 V supplies, and are specified for temperatures from –40 °C to +125 °C, making them suitable for ADC/DAC buffering, audio, industrial controls, and precision filtering.
The datasheet lists detailed electrical specifications, absolute maximum ratings, typical performance curves, and layout recommendations. Pin configurations for both 8‑lead MSOP and SOIC packages are provided, along with ordering information for the various part numbers.
| Low Noise (10 kHz) | 2.7 nV/√Hz |
|---|---|
| Offset Voltage | 250 pV max |
| Offset Voltage Drift | 0.4 pV/°C typ, 2.3 pV/°C max |
| Bandwidth | 28 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Operating Temperature Range | -40 °C to +125 °C |
| Supply Current (typical) | 3.7 mA per amplifier |
| Input Bias Current | 10 pA |
| Gain Bandwidth Product | 28 MHz |
| Slew Rate | 11 V/µs |
The amplifiers achieve a noise density of 2.7 nV/√Hz at 10 kHz.
They operate from 2.7 V up to 5.5 V.
The devices are specified for –40 °C to +125 °C operation.
Typical supply current is 3.7 mA per amplifier.