Parameter:
Automatic Gain Control (AGC).
Three gain settings (40dB, 50dB, 60dB).
Programmable attack and release ratio.
Supply voltage range from 2.7V to 5.5V.
Low noise density based on 30 nV/input.
Low THD: 0.04% (typical).
Low power shutdown mode.
Built -in 2V low noise microphone bias.
Available in a space-saving 14-pin TDFN (3mm x 3mm) package.
-40°C to +85°C Extended temperature range.
Size: 26*14*8mm.

Description:
The MAX9814 is a high-quality microphone amplifier with automatic gain control and low-noise microphone bias. The device features a low noise preamplifier, a variable gain amplifier (VGA), an output amplifier, a microphone bias generator and an AGC control circuit.

The low noise preamplifier has a fixed gain of 12dB, while the VGA gain is automatically adjusted from 20dB to 0dB depending on the output voltage and AGC threshold. The output amplifier offers selectable gains of 8 dB, 18 dB and 28 dB. Without compression, cascading the amplifiers results in a total gain of 40 dB, 50 dB, or 60 dB.

A three-stage digital input programs the gain of the output amplifier. An external resistor divider controls the automatic gain control threshold and a single capacitor programs the attack/release times.

A three-stage digital input programs the ratio of attack to release time. The automatic gain control timeout is set to 30 ms. The low noise microphone bias generator can bias most electret microphones.

Applications:
Bluetooth headphones, digital still cameras, digital video cameras, entertainment systems (e.g. karaoke), high-quality portable recorders. IP telephones/teleconferences, PDA, two-way communicators.

Package included:
3 x MAX9814 Microphone Amplifier Module MIC Microphone Sound Amplifier Microphone Sensor