The MAX4465-MAX4469 are micropower op amps optimized for use as microphone preamplifiers. They provide the ideal combination of an optimized gain bandwidth product vs. supply current, and low voltage operation in ultra-small packages. The MAX4465/ MAX4467/MAX4469 are unity-gain stable and deliver a 200kHz gain bandwidth from only 24µA of supply cur- rent. The MAX4466/MAX4468 are decompensated for a minimum stable gain of +5V/V and provide a 600kHz gain bandwidth product. In addition, these amplifiers feature Rail-to-Rail® outputs, high AVOL, plus excellent power-supply rejection and common-mode rejection ratios for operation in noisy environments. The MAX4467/MAX4468 include a complete shutdown mode. In shutdown, the amplifiers’ supply current is reduced to 5nA and the bias current to the external microphone is cut off for ultimate power savings. The single MAX4465/MAX4466 are offered in the ultra-small 5-pin SC70 package, while the single with shutdown MAX4467/MAX4468 and dual MAX4469 are available in the space-saving 8-pin SOT23 package.
The MAX4465‑MAX4469 family are micropower operational amplifiers optimized for microphone pre‑amplification. They provide rail‑to‑rail outputs, high common‑mode and power‑supply rejection, and optional complete shutdown modes for ultra‑low power consumption.
The devices are offered in ultra‑small SC70 (5‑pin) and SOT‑23 (8‑pin) packages and operate from a single +2.4 V to +5.5 V supply. Detailed electrical characteristics, pin configurations, and typical application circuits are provided.
| Typical Supply Current | 24 µA |
|---|---|
| Common‑Mode Rejection Ratio (CMRR) | 126 dB |
MAX4465/6 are offered in 5‑pin SC70 packages, while MAX4467/8/9 use 8‑pin SOT‑23 packages.