The BiFET series is a high-performance dual junction operational amplifier with features such as ultra-low drift, low input bias current, and low noise. It can be used in a wide range of applications.
The AD542, AD544, and AD547 BiFET operational amplifiers offer ultralow drift, low offset voltage, and extremely low input bias currents, making them suitable for precision instrumentation, audio, and data‑converter applications. The document describes the series' performance advantages, recommended uses, and available grades and packages.
Detailed electrical specifications, typical characteristic curves, and application hints—including guarding techniques, input protection, and DAC interfacing—are provided. Ordering information and mechanical dimensions for the TO‑99 (H‑08A) hermetic metal can package are also included.
| Ultralow Drift | 1 µV/°C (AD547L) |
|---|---|
| Low Offset Voltage | 0.25 mV (AD547L) |
| Input Bias Current | 25 pA max |
| Quiescent Current | 1.5 mA |
| Noise | 2 µV p‑p |
| Open Loop Gain | 110 dB |
| Slew Rate | 13 V/µs |
| Total Harmonic Distortion | 0.0025 % |
The input bias current is specified as 25 pA max for the series.
The amplifiers have a high slew rate of 13 V/µs.
They are offered in a hermetically sealed TO‑99 metal can package and as bare die for hybrid applications.
The S grade operates from –55 °C to +125 °C.