AN618 Panasonic Semiconductor, AN618 Datasheet - Page 20
AN618
Manufacturer Part Number
AN618
Description
Recording and playing amplifier IC for answering telephones
Manufacturer
Panasonic Semiconductor
Datasheet
1.AN618.pdf
(21 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AN6180K
Manufacturer:
OKI
Quantity:
6 242
AN6175K
20
Pin No.
Detailed Pin Descriptions(cont.)
31
32
33
34
35
36
37
HS, HF/MF
HS/HF
Vr
ST
MFI
HF1
V
CC
2
Symbol
[Mode switching(handset/hands-free)]
This pin must be connected to V
the HS mode (SW1 to a), or to GND for
the HF mode (SW1 to b).
[Reference for the handset or hands-free
mode]
The voltage equal to half the V
age is output.
[Input to the base of the power supply
This pin connects to the base of Q4.
[MF input]
MF signals are input to this pin through
C35(0.1 F). The input impedance,
Zin=20 k .
[From transmitter att. output(hands-free
The transmitter attenuator output is sent
from Pin18 to this pin through C37(0.1
[Transmission amp. AC impedance setting]
This pin connects to V
(100 F)and to the collector of Q3 (trans-
mission transistor)through R38(330 ).
[Mode switching(handset or hands-free
/MF)]
This pin must be connected to V
the HS or HF mode(SW2 to a), or to
GND for the MF mode (SW2 to b).
transistor]
mode)]
F). The input impedance, Zin=20 k .
Description
CC
1 through C38
CC
CC1
1 volt-
CC1
for
for
35
32
20k
31
Equivalent circuit
V
V
50k
50k
CC
CC
100k
100k
1
1
ICs for Telephone
–
–
34
33
36