General Description

The MAX9814 is a low-cost, high-quality microphone amplifier with automatic gain control (AGC) and low noise microphone bias. The device features a low-noise preamplifier, variable gain amplifier (VGA), output amplifier, microphone-bias-voltage generator and AGC control circuitry.

Features

♦Automatic Gain Control (AGC)

♦Three Gain Settings (40dB, 50dB, 60dB)

♦Programmable Attack Time

♦Programmable Attack and Release Ratio

♦2.7V to 5.5V Supply Voltage Range

♦Low Input-Referred Noise Density of 30nV/√Hz

♦Low THD: 0.04 (typ)

♦Low-Power Shutdown Mode

♦Internal Low-Noise Microphone Bias, 2V

♦Available in the Space-Saving, 14-Pin TDFN (3mm x 3mm) Package

♦-40°C to +85°C Extended Temperature Range

Applications

Digital Still Cameras

Digital Video Cameras PDAs

Bluetooth Headsets

Entertainment Systems (e.g., Karaoke)

Two-Way Communicators

High-Quality Portable Recorders

IP Phones/Telephone Conferencing