MAX9814 High Performance Microphone

Key Features:

• Automatic Gain Control (AGC): Maintains consistent output volume

• Programmable Gain and AGC Timing: Customize response to noise and dynamics

• Low Noise Microphone Bias (2V): Optimized for electret microphones

• Analog Output: Compatible with ADCs on 3.3V systems

• Low Power Shutdown Mode: Ideal for portable or battery-powered designs

• Wide Audio Frequency Response: From 20Hz up to 20kHz

Specifications:

• IC: MAX9814

• Supply Voltage: 2.7V – 5.5V

• Current Draw: ~3mA

• Output Signal: 2Vpp (peak-to-peak) on 1.25V DC bias

• Fixed Front-End Gain: 12dB

• Selectable Output Gain: 8dB / 18dB / 28dB

• Overall Gain Options: 40dB / 50dB / 60dB

• Frequency Response: 20Hz – 20kHz

• Noise Density: 30nV/√Hz

• Total Harmonic Distortion (THD): 0.04% (typical)

• AGC Hold Time: 30ms

• AGC Threshold & Timing: Programmable via external components

• AGC Attack/Release Ratio: 1:4000 (default), 1:2000, 1:500

Applications:

• Speech recognition and voice control systems

• Bluetooth headsets and wearable audio devices

• High-quality portable recorders

• IP phones and teleconferencing equipment

• Smart home assistants and IoT audio input modules