ICs for Telephone
1
AN6215S
AGC IC for telephone speech network
n Overview
The AN6215S is an AGC IC for telephone speech
network, and it incorporates an microphone input detec-
tion circuit and a receiver gain control circuit. It is espe-
cially best suited for cordless telephone thanks to a good
speech tone quality obtained by reducing howling and echo
sound.
n Features
• Operation with wide power supply voltage range from
2.1 V to 6.0 V
• Enlargement of dynamic range by incorporating a

vari-
able V
REF
circuit that varies according to the supply
voltage
• Possible to adjust the received voice attenuation amount
with an external resistor
• Possible to adjust the AGC operating point with an ex-
ternal resistor
• Possible to design with fewer external components
n Block Diagram
SOP008-P-0225A
Unit: mm
1
2
3
4
8
7
6
5
0.4 ± 0.25
0.6 ± 0.3
1.27
5.0 ± 0.3
0.1 ± 0.1
0.3
4.2 ± 0.3
6.5 ± 0.3
0.15 0.65
1.5 ± 0.2
V
REF
Det.
CC
Buff
1 2 3 4
8
V
CC
GND
7 6 5