The AD8638 (single‑channel) and AD8639 (dual‑channel) are broadband, zero‑drift operational amplifiers with rail‑to‑rail output swing and ultra‑low noise. They are designed for precision applications such as pressure and position sensors, strain‑gauge amplifiers, medical instruments, and automotive sensors.
Key features include input offset voltages as low as 3 µV, input bias currents of 40 pA, high CMRR (up to 133 dB) and PSRR (up to 143 dB), and a gain‑bandwidth product of 1.35 MHz. The devices are available in several compact packages (5‑pin SOT‑23, 8‑pin SOIC, MSOP, LFCSP) and support both single‑supply (5 V–16 V) and dual‑supply (±2.5 V–±8 V) operation.
| Input offset voltage (VOS) | 3–9 µV |
|---|---|
| Input bias current (IB) | 40 pA (typical) |
| Common‑mode rejection ratio (CMRR) | 133 dB (typical) |
| Power‑supply rejection ratio (PSRR) | 143 dB (typical) |
| Supply voltage range | 5 V–16 V single‑supply or ±2.5 V–±8 V dual‑supply |
| Typical power consumption per amplifier | 1.3 mA |
Typical input offset voltage is between 3 µV and 9 µV.
They operate from 5 V to 16 V with a single supply, or from ±2.5 V to ±8 V with a dual supply.
Yes, the AD8639 is automotive‑application certified.
Typical supply current per amplifier is about 1.3 mA.