DESCRIPTION
The Electret Microphone Amplifier 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 breakout. The default 'max gain' is 60dB, but can be set to 40dB or 50dB by jumpering the Gain pin to VCC or ground. You can also change the Attack/Release ratio, from the default 1:4000 to 1:2000 or 1:500. The output from the amp is about 2Vpp max on a 1.25V DC bias, so it can be easily used with any Analog/Digital converter that is up to 3.3V input. If you want to pipe it into a Line Input, just use a 1-100uF blocking capacitor in series (100uF sounds best).
FEATURES
- Automatic Gain Control (AGC)
- 3 gain settings (40dB, 50dB, 60dB)
- Programmable operation time
- Programmable operation and release time than
- Programmable attack and release ratio
- Low input noise density 30nV
- Low-Power Shutdown Mode
- Built-2V low-noise microphone bias
TECHNICAL DETAILS
- Operating Voltage: 2.7V - 5.5V
- Operating Current: 3mA
- Output: 2Vpp on 1.25V bias
- Frequency Response: 20Hz - 20KHz
- Low THD: 0.04% (typ)
- Operating Temperature: -40°C to +85°C
SHIPPING LIST
- 1x Electret Microphone Amplifier MAX9814 with Auto Gain Control
- 1x Male Header 4-Pin