Electret Microphone Amplifier - MAX9814 with Auto Gain Control
Product characteristics
MAX9814 is a low cost and high performance microphone amplifier with automatic gain control (AGC) and low noise microphone bias. The device has low noise front-end amplifier, variable gain amplifier (VGA), output amplifier, microphone bias voltage generator and AGC control circuit.
Product details
Automatic gain control (AGC)
Three gain settings (40dB, 50dB, 60dB) can be used for programmable action time
Programmable action and release time ratio power supply voltage range 2.7V?5.5V
Low THD: 0.04% (typical)
Low power shutdown mode
Built-in 2V low noise microphone bias
Pin description
VCC: positive power supply
GND: ground
GAIN:
Gain control of tri-state amplifier
GAIN=VDD and the gain is set to 40db
GAIN=GND, and the gain is set to 50db
GAIN= floating, and the gain is set to 60db
OUT: amplifier output
AR:
Three-state start-up and release ratio selection controls the start-up time and release time ratio of AGC circuit
A/R=GND: start/release ratio is 1:500
A/R=VDD: start/release ratio is 1:2000
A/R= suspended: start/release ratio is 1:4000
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