General Description

The MAX9812/MAX9813 are single/dual-input, 20dB fixed-gain microphone amplifiers. They offer tiny packaging and a low-noise, integrated microphone bias, making them ideal for portable audio applications such as notebook computers, cell phones, and PDAs. These amplifiers feature a 500kHz bandwidth, Rail-to-Rail® outputs, an industry-leading 100dB power-supply rejection ratio, and a very low 0.015% THD+N. Power-saving features include very low 230µA supply current and a total shutdown mode that cuts the combined supply and BIAS currents to only 100nA.

Features

♦PC2001 Compliant

♦100dB at 217Hz Power-Supply Rejection Ratio

♦Very Low 230µA Quiescent Current

♦Low 0.015% THD+N

♦Available in Two Versions

  MAX9812L/MAX9813L—2.7V to 3.6V

  MAX9812H/MAX9813H—4.5V to 5.5V

♦Internal Low-Noise Microphone Bias Supply

  2.3V for MAX9812L/MAX9813L

  4.0V for MAX9812H/MAX9813H

♦100nA Low-Power Shutdown Mode

♦Rail-to-Rail Outputs

♦20dB Fixed Gain

♦Available in Tiny 6-Pin SC70 (2mm x 2.1mm) and 8-Pin SOT23 (3mm x 3mm) Packages

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

Applications

Notebook Computers

PDAs

Smart Phones

Car Kit Adapters

Digital Cameras

Video Tape Recorders