ACEIRMC MAX9814 Electret Microphone Amplifier 5pcs Auto Gain Control for Arduino

The MAX9814 is a high-quality microphone amplifier with automatic gain control (AGC) and low-noise microphone bias. The device includes a low-noise preamplifier, variable gain amplifier (VGA), output amplifier, microphone bias voltage generator, and AGC control circuit. A three-level digital input programs the output amplifier gain. An external resistive divider controls the AGC threshold and a single capacitor programs the attack/release time. The low noise preamplifier has a fixed 12dB gain, and the VGA gain automatically adjusts from 20dB to 0dB depending on the output voltage and AGC threshold. The output amplifier provides selectable gain of 8dB, 18dB, and 28dB. With no compression, the cascade of amplifiers provides an overall gain of 40dB, 50dB, and 60dB. The MAX9814 is housed in a space-saving 14-pin TDFN package. This device is specified for an extended temperature range of -40°C to +85°C. MAX9814: Simple Block DiagramMAX9814: Simple Block Diagram Enlarge+ 3-level digital input program to program attack to release time ratio. AGC retention time is fixed at 30ms. Low Noise Microphone - Bias voltage generator can bias most electret microphones.

Description: Automatic Gain Control (AGC). Three gain settings (40dB, 50dB, 60dB). Programmable attack time. Programmable attack and release ratio. 2.7V~5.5V supply voltage range. Low THD: 0.04% (typ.) Low power shutdown mode. Internal low noise microphone bias 2V Applications: Bluetooth headsets Digital still cameras Digital video cameras Entertainment systems (e.g. karaoke) High quality portable recorders IP telephones/telephone conferences, PDAs, two-way communicators. Package Includes: 5 x MAX9814 Electret Microphone Amplifier