The AD8429 is an ultralow noise, high accuracy instrumentation amplifier with input noise of 1 nV/√Hz and output noise of 45 nV/√Hz. It is ideal for applications such as medical instrumentation, precision data acquisition, microphone preamplification, and vibration analysis.
The AD8429 is an ultra‑low‑noise instrumentation amplifier designed for measuring extremely small signals over a wide temperature range (‑40 °C to +125 °C). It offers 1 nV/√Hz input noise, high CMRR, and a wide gain range set with a single resistor.
The document provides full specifications, absolute maximum ratings, pin descriptions, typical performance graphs, and guidance on input protection, RFI suppression, and noise calculations, along with ordering information for the 8‑lead SOIC package.
| Input voltage noise (eni) typical | 1.0 nV/√Hz |
|---|---|
| Output voltage noise (eno) typical | 45 nV/√Hz |
| Bandwidth (G=1) typical | 15 MHz |
| Gain range | 1 to 10,000 |
The AD8429 has an input voltage noise density of 1 nV/√Hz (typical).
Gain is set with a single resistor between the RG pins: G = 1 + (6 kΩ / R_G).
The maximum input offset voltage is 50 µV at a gain of 1.