AN618 Panasonic Semiconductor, AN618 Datasheet - Page 21

• Manufacturer Part Number: AN618
• Description: Recording and playing amplifier IC for answering telephones
• Manufacturer: Panasonic Semiconductor

ICs for Telephone
Pin No.
Detailed Pin Descriptions(cont.)
40
38
39
41
42
TRB
TRE
BGR
V
SOUT
CC
1
Symbol
[To the emitter of the transmission transistor]
This pin connects to the emitter of Q3
(transmission transistor)and R33 to adjust
the Q3 gain.
[Band-gap ref. voltage output]
Connects to GND through C39(47 F).
[Power output to the handset and hands-
free circuits]
The power supply pin for the signal proc-
essing circuits.
[Hands-free control output]
Outputs transmitter monitor signals in the
HF mode. Connects through R16 and
C10 to LOG amp.(2)input at Pin8.
[To the base of the transmission transistor]
This pin connects to the base of Q3
(transmission transistor).
Description
BGR
Equivalent circuit
–
–
42 SOUT
AN6175K
39
BGR
38
40
21