MAX9814 Microphone Module in Pakistan The MAX9814 is a low cost, high performance microphone amplifier with automatic gain control (AGC) and low noise microphone bias. The device features a low-noise front-end amplifier, a variable gain amplifier (VGA), an output amplifier, a microphone bias voltage generator, and an AGC control circuit.
The MAX9814 Microphone Amplifier Module is available in the space-saving ijn PAKISTAN, 14-pin TDFN package. This device is also specified over the -40°C to +85°C extended temperature range. MAX9814 is a low-cost, 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 program the attack/release times. A trilevel digital input programs the ratio of attack-to-release time. The hold time of the AGC is fixed at 30ms. The low-noise microphone-bias-voltage generator can bias most electret microphones.Mekatroniks.com
Automatic Gain Control (AGC
3 kinds of gain settings (40dB, 50dB, 60dB)
programmable action time
programmable action and release time ratio
Supply voltage range 2.7V ~ 5.5V
Low THD: 0.04% (typical)
Low-power shutdown mode
Built-in 2V low noise microphone bias
Features and Specifications,
- Bluetooth Headsets
- Two-Way Communicators
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- IP Phones/Telephone Conferencing