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Electret Microphone Amplifier MAX9814 Low Noise & AGC

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Buy Electret Microphone Amplifier MAX9814 Low Noise & AGC

Electret Microphone Amplifier MAX9814 Low Noise & AGC overview

Electret microphone amplifier MAX9814 is a low-cost, high-quality microphone amplifier with automatic gain control (AGC) and low-noise microphone bias.MAX9814 Microphone 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.MAX9814 Electret microphone amplifier is available in the space-saving, 14-pin TDFN package. This device is specified over the -40°C to +85°C extended temperature range.

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.

Key specifications

Output
2Vpp on 1.25V bias
Supply Voltage
2.7v-5.5v @ 3mA current
Frequency Response
20Hz – 20 KHz
Automatic gain, selectable max from
40dB, 50dB or 60dB
Low Input-Referred Noise Density of
30nV
Low THD
0.04% (type )

Electret Microphone Amplifier MAX9814 Low Noise & AGC features

  • Automatic Gain Control (AGC)
  • Three Gain Settings (40dB, 50dB, 60dB)
  • Programmable Attack Time
  • Programmable Attack and Release Ratio
  • 2.7V to 5.5V Supply Voltage Range
  • Low Input-Referred Noise Density of 30nV/√Hz
  • Low THD: 0.04% (Typ)
  • Low-Power Shutdown Mode
  • Internal Low-Noise Microphone Bias, 2V
  • Available in the Space-Saving, 14-Pin TDFN (3mm x 3mm) Package
  • -40°C to +85°C Extended Temperature Range

Electret Microphone Amplifier MAX9814 Low Noise & AGC pinout

NameDescription
VCCModule power supply – 2.7-5.5 V
GNDGround
OUTAnalog data output to the microcontroller
GainAdjusting maximum module output*
ARAdjusting module accuracy*

Electret Microphone Amplifier MAX9814 Low Noise & AGC applications

  • Bluetooth Headsets
  • Two-Way Communicators
  • High-Quality Portable Recorders
  • IP Phones/Telephone Conferencing
  • Digital Still Cameras
  • Digital Video Cameras
  • PDAs

More about Electret Microphone Amplifier MAX9814 Low Noise & AGC

Datasheet

Download Datasheet from the link given below.

Download Datasheet

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