Datasheet

Microphone Amplifier with AGC and
Low-Noise Microphone Bias
Typical Application Circuit/Functional Diagram
AGC
MICBIAS
BIAS
R
MICBIAS
2.21kΩ
R
1
150kΩ
R
2
100kΩ
MICIN
C
OUT
GND
V
DD
C
IN
0.1μF
A/R
MICBIAS
GAIN
TH
MICOUT
V
DD
V
DD
SHDN
C
BYPASS
1μF
C
BIAS
0.47μF
CG
C
CG
2.2μF
CT
C
CT
470nF
REF
LNA
VGA
R
OUT
*THE DEVICE HAS BEEN CONFIGURED WITH AN ATTACK TIME OF 1.1ms, 40dB GAIN, AND AN ATTACK-AND-RELEASE RATIO OF 1:500.
MAX9814
MAX9814
10
Maxim Integrated