DollaTek MAX9814 Electret MIC Microphone Amplifier Module Auto Gain Control for Arduino

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Product description

  • The MAX9814 is a high-quality microphone amplifier with automatic gain control (AGC) and low-noise microphone bias. The device features a low-noise preamplifier, variable gain amplifier (VGA), output amplifier, microphone-bias-voltage generator and AGC control circuitry.
  • The low-noise preamplifier has a fixed 12dB gain, while the VGA gain automatically adjusts from 20dB to 0dB, depending on the output voltage and the AGC threshold. The output amplifier offers selectable gains of 8dB, 18dB, and 28dB. With no compression, the cascade of the amplifiers results in an overall gain of 40dB, 50dB, or 60dB.
  • A trilevel digital input programs the output amplifier gain. An external resistive divider controls the AGC threshold and a single capacitor programs the attack release times.
  • The MAX9814 is available in the space-saving, 14-pin TDFN package. This device is specified over the -40 C to +85 C extended temperature range. MAX9814 Simplified Block Diagram MAX9814 Simplified Block Diagram Enlarge+

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