MAX9814 Microphone Amplifier Module AGC Module Auto Gain Control Arduino [ElectricA]

The chip at the heart of this amp is the MAX9814, and has a few options you can configure with the breakout. The default ‘max gain’ is 60dB, but can be set to 40dB or 50dB by jumpering the Gain pin to VCC or ground. You can also change the Attack/Release ratio, from the default 1:4000 to 1:2000 or 1:500. The ouput from the amp is about 2Vpp max on a 1.25V DC bias, so it can be easily used with any Analog/Digital converter that is up to 3.3V input. If you want to pipe it into a Line Input, just use a 1-100uF blocking capacitor in series (100uF sounds best).

Supply Voltage: 2.7v-5.5v @ 3mA current
Output: 2Vpp on 1.25V bias
Frequency Response: 20Hz – 20 KHz
Programmable Attack and Release Ratio
Automatic gain, selectable max from 40dB, 50dB or 60dB
Low Input-Referred Noise Density of 30nV/
Low THD: 0.04% (typ)

Applications
Bluetooth Headsets
Two-Way Communicators
High-Quality Portable Recorders
IP Phones/Telephone Conferencing