AN6425K Datasheet, PDF (1/8 Pages) Panasonic Semiconductor – Speech Network Circuit

AN6425K
Speech Network Circuit
s 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.
s 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)
Unit : mm
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
1.05±0.25
8.4±0.3
4.8±0.25 3.05±0.25
3 to 15˚
10.16±0.25
0.3^{+–0.01.05}
28-pin Shrunk DIL Plastic Package (SDIP028-P-0400B)
s Block Diagram
VL
28
27
26
25
24
23
22
21
20
19
18
17
16
15
80kΩ
SP
Amp.
CLASS A
Push pull
CLASS B
BTL
+
REC
DRIVER
–
+
REC
DRIVER
–
30kΩ
30kΩ
1V
2kΩ
2kΩ
2V REG
2V
–
D5dB D3dB
+ D6dB
REC
in
DVR
40kΩ
4kΩ
KT
HT
1V REFF
VL
1V
Battery
Selector
65kΩ
SEND D12
Amp dB
MUTE
Filter
Amp.
TT
in
MIC
D3dB ⁱⁿ
Logic
INV
NAND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
GND