AN6425K

Manufacturer Part NumberAN6425K
DescriptionSpeech Network Circuit
ManufacturerPanasonic
AN6425K datasheet
 
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AN6425K
Speech Network Circuit
Overview
The AN6425K is a high-function speech network IC with
speaker amplifier. It incorporates a transmitter-system non-lin-
ear circuit, receiver digital VRs, etc. and is suitable for realiz-
ing the multifunctional telephone sets.
Features
Speech network IC for the multifunctional telephone sets
Capable of interfacing with the light-weight small receivers
and ECM transmitters
Built-in 2V REG constant voltage source (2V typ) for ECM
Built-in non-linear circuits in the transmitter and receiver
systems in order to eliminate ambient noises
Built-in speaker amplifier and capable of driving with a main
wire current
Built-in hold-tone amplifier, key-in-tone amplifier, and
DTMF transmitter, and capable of setting the mode with the
control pins
Automatic gain control (automatic pad function) according to
a circuit curret
Built-in tertiary active filter circuit and capable of sending a
DTMF circuit with much higher harmonic at a low distortion
factor
Built-in single touch receiver volume-up function (about
6dB)
Block Diagram
VL
28
27
26
25
24
23
CLASS B
BTL
+
SP
REC
Amp.
DRIVER
CLASS A
Push pull
30k
1V
2V REG
2V
1V REFF
VL
1V
Battery
Selector
65k
1
2
3
4
5
6
GND
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
8.4 0.3
4.8 0.25
3 to 15˚
10.16 0.25
28-pin Shrunk DIL Plastic Package (SDIP028-P-0400B)
22
21
20
19
18
17
80k
D5dB
D3dB
+
REC
+
D6dB
REC
DRIVER
DVR
40k
30k
2k
2k
KT
HT
TT
in
D12
SEND
Filter
MIC
Amp.
dB
Amp
in
D3dB
MUTE
7
8
9
10
11
12
Unit : mm
1.05 0.25
3.05 0.25
16
15
in
4k
Logic
INV
NAND
13
14

AN6425K Summary of contents