The MAX9814 is a low-cost, high-performance microphone amplifier with automatic gain control (AGC) and low-noise microphone bias. The device has a low-noise front-end amplifier, variable gain amplifier (VGA), output amplifier, microphone bias voltage generator and AGC control circuit
Chip Specification
1
Supply Voltage: 2.7v-5.5v @ 3mA current
2
Output: 2Vpp on 1.25V bias
3
Frequency Response: 20Hz - 20 KHz
4
Programmable Attack and Release Ratio
5
Automatic gain, selectable max from 40dB, 50dB or 60dB
6
Low Input-Referred Noise Density of 30nV/
7
Low THD: 0.04% (typ)
Feature
Automatic gain control (AGC) 3 gain settings (40dB, 50dB, 60dB) Programmable action time Programmable action and release time ratio 2.7V to 5.5V supply voltage range Low input noise density 30nV/ Low THD: 0.04% (typical value) Low power shutdown mode Built-in 2V low noise microphone bias Provides a space-saving 14-pin TDFN (3mm x 3mm) package -40°C to +85°C extended temperature range
