MAX9814 Module Electret Microphone Amplifier Board

MAX9814 Module also know as Electret microphone amplifier board Low Noise & AGC is a low-cost, high-quality microphone amplifier with automatic gain control (AGC) and low-noise microphone bias.

MAX9814 Microphone features a low-noise pre amplifier, variable gain amplifier (VGA), output amplifier, microphone-bias-voltage generator and AGC control circuitry.

The low-noise pre amplifier 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.

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.

This fancy electret microphone amplifier – max9814 with auto gain control (AGC) Module is a step above the rest, with built-in automatic gain control. The AGC in the amplifier means that nearby ‘loud’ sounds will be quieted so they don’t overwhelm & ‘clip’ the amplifier, and even quiet, far-away sounds will be amplified.

This amplifier is great for when you want to record or detect audio in a setting where levels change and you don’t want to have to tweak the amplifier gain all the time.

The chip at the heart of this amp is the MAX9814, and has a few options you can configure with the MAX9814 Microphone amplifier. The default ‘max gain’ is 60dB, but can be set to 40dB or 50dB by jumpering the Gain pin to VCC or ground.

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

MAX9814 Module Specifications: –

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

MAX9814 Module Applications: –

• Bluetooth Headsets
  
• Two-Way Communicators
  
• High-Quality Portable Recorders
  
• IP Phones/Telephone Conferencing
• Digital Still Cameras
• Digital Video Cameras
• PDAs
• Entertainment Systems (e.g., Karaoke)

MAX9814 Module Datasheet: –

datasheets.maximintegrated.com/…/MAX9814.pdf

Package: –

1 x Electret Microphone Amplifier MAX9814 Low Noise & AGC

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