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

Parameters:

Automatic gain control (AGC)

Three gain settings (40dB, 50dB, 60dB)

Start time can be set

Start and release ratio can be set

2.7V to 5.5V supply voltage range

Thd up to 0.04% (typ.) for input reference noise density up to 30 kHz

Internal low noise Microphone Bias, 2V

Temperature range of expansion stage from -40 ℃ to + 85 ℃