n Overview
The AN6448NFBP is a speech network IC suitable for multi-
function cordless telephones. It incorporates a cross-point
switch controlled by serial input. It allows speech path switch-
ing and mixing, and provides for three- or four-person commu-
nication and other sophisticated functions. It also incorporates
REC/PLAY amplifiers with VOX circuits.
n Features
• The speech block can operate on line voltage, with no exter-
nal power supply, and is operational even during a commer-
cial power failure.
• Incorporates auto. PAD, dial mute, DC voltage regulation,
and other basic speech functions.
• The cross-point switch can be operated independently.
• Each output of the cross-point switch can correspond to mul-
tiple inputs, allowing three-or four-person communication.
• The REC/PLAY amplifiers incorporate ALC and VOX circuits.
• Receiver volume can be increased by 6 dB or 9 dB.
AN6448NFBP
Speech Network IC Incorporating Cross-Point Switch
Unit : mm
QFP package with 64 pins (QFH064-P-1414A)
17.2– 0.4
14.0– 0.3
17.2
–
0.4
14.0
–
0.3
48 33
116
17
32
64
49
2.85
–
0.2
1.3
–
0.1
1.3
–
0.1
0.1
–
0.1
0.2
+0.1
-0.05
0.35
+0.1
-0.050.8(0.8)
SEATING PLANE
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
1612345678910112131415
10dB
0/12
dB
20
dB
18
dB
18
dB
Comp
0dB
0dB
0dB
0dB 0dB
0dB
0dB
0dB
0dB
0dB
–
+
–
+
–
+
–
+
–
+
V
REF
–
+
VOX
Det.
I
N
J
ACL
Det
ACL
Line
Supply
Monitor
Hold off
Latch
Decoder
Power Supply Control
V
REF
AP
AP
AP
Cont.
DM
Cont.
DC
Cont.
D
a
1
a
2
a
3
a
4
a
5
a
6
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
20
dB
3348 47 46 45 44 43 42 41 40 39 38 37 36 35 34
P.O.R
n Block Diagram