ICs for Telephone
AN6426NK
Hands-free Speech Network IC
s
Overview
The AN6426NK incorporates both speech network and
hands-free functions. Its well designed block configura-
tion allows realization of a hands-free telephone with a
minimal number of components.
36.8±0.3
1
42
0.5±0.1
0.9±0.25
21
13.7±0.3
4.76±0.25
0.3
– 0.05
+0.1
Unit : mm
s
Features
•
Incorporates all the functions required of a hands-free
telephone.
•
Incorporates all the functions required of a handset.
•
Complies with AC and DC impedance requirements.
•
Provides a wide dynamic range.
•
A noise detecting circuit prevents inadvertent transmis-
sion.
•
Operation on an external power supply is available.
•
Each mode can be easily controlled.
•
A built-in loudspeaker amplifier can operated either on
line voltage or an external power supply.
22
0.96±0.25
4.5±0.25
3 to 15°
15.3±0.25
SDIP package with 42 pins (SDIP042-P-0600A)
s
Block Diagram
V
L
38
37
–
MA2
Vrl
+
40
Vrl
+
12
13
18
16
–
+
+
–
+
–
MA1
–
V
CC1
42
36
34
V
CC2
29
6
5
35
GND
1
39
19
14
AP
Buff-
er
15
Send
41
Power
Regulator
Power
Regulator
Power
Regulator
Matrix
Circuit
33
32
V
B
TATT
V
B
T
Log
Matrix
Circuit
31
30
Vr1
20
21
22
23
AGC
V
CC1
17
24
28
V
B
27
Vrl
Rec
Pre
11
AP
Buffer
–
S.Amp
+
R
Log
Comp
Attenator
Control
Vr1
–
Rec.1
+
–
Rec.2
+
Vr2
V
B
RATT
Vr1
2
3
26
4
25
10
9
7
8
1
PANASONIC [ PANASONIC SEMICONDUCTOR ]
