AN618 Panasonic Semiconductor, AN618 Datasheet - Page 17

• 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.)
12
13
14
15
16
17
TLO2
RLO1
RLO2
REC–CONT
RVR
ATC
Symbol
[LOG amp.(3)output]
Outputs the amplified receiver preamp.
output. Grounded through C15(2.2
The attack recovery time of the attenuator
changes with the capacitance of C15.
[LOG amp.(4)output]
Outputs the amplified loudspeaker amp.
output. Grounded through C16(2.2
The attack recovery time of the attenuator
changes with the capacitance of C16.
[Receiver switching]
Determines whether the attenuator is to
be in the receiver mode or normal mode.
If this pin is connected to V
b), the receiver mode is selected. If con-
nected to GND(SW3 to a), the normal
mode is selected.
[Receiver att. gain control]
An external rheostat circuit connects to
this pin to control the receiver attenuator
gain.
[Receiver att. switching control]
R22(51 k )and C18(4.7
this pin to adjust the attenuator switching
time.
[LOG amp.(2)output]
Outputs the amplified hands-free control
output. Grounded through C14(2.2
The attack recovery time of the attenuator
changes with the capacitance of C14.
Description
F)connect to
CC
1(SW3 to
F).
F).
F).
–
16
15
Equivalent circuit
100k
100k
17
V
V
V
CC
CC
CC
1
1
1
12
13
14
AN6175K
17