The AD8505/AD8506/AD8508 are single, dual, and quad micro- power amplifiers featuring rail-to-rail input/output swings while operating from a single 1.8 V to 5 V power supply or from dual ±0.9 V to ±2.5 V power supplies. Using a new circuit technology, these amplifiers offer zero input cross-over distortion, low noise (45 nV/√Hz at 1 kHz), very low input bias current (1 pA typical), and up to 100 dB of PSRR and 105 dB of CMRR over the entire operating range.
The AD8505, AD8506, and AD8508 are single, dual, and quad micro‑power amplifiers offering rail‑to‑rail input/output operation from 1.8 V to 5 V supplies. They feature zero input crossover distortion, very low bias current, and low noise, making them suitable for battery‑powered sensors, handheld instrumentation, and hazard‑detection equipment.\n\nKey specifications include a typical supply current of 24 µA (AD8505) to 20 µA (AD8506/AD8508) at 1.8 V, input bias current of 10 pA, PSRR of at least 100 dB, CMRR up to 105 dB, and an operating temperature range of –40 °C to +125 °C. The devices are offered in 5‑lead SOT‑23, 6‑ball WLCSP, 8‑lead MSOP, 8‑ball WLCSP, 14‑lead TSSOP and 14‑ball WLCSP packages.
| Input Bias Current | 10 pA typical |
|---|---|
| Power Supply Rejection Ratio (PSRR) | 100 dB minimum |
| Common‑Mode Rejection Ratio (CMRR) | 105 dB typical |
| Operating Temperature Range | −40 °C to +125 °C |
| Maximum Supply Voltage | 5.5 V |
The input bias current is typically 10 pA.
The AD8505 is offered in a 5‑lead SOT‑23 package and a 6‑ball WLCSP package.
The devices can tolerate up to 5.5 V supply voltage.