an6472nfbp Panasonic Corporation of North America, an6472nfbp Datasheet - Page 13

• Manufacturer Part Number: an6472nfbp
• Description: Cordless Telephone Speech Network Ic Incorporating Cross-point Switch
• Manufacturer: Panasonic Corporation of North America

ICs for Telephone
Pin No. Pin name I/O
29
30
31
32
33
34
35
36
37
38
39
Pin Descriptions (cont.)
GND
L–
V
VOX–
OUT
SP–
OUT
RF2–
OUT
RF1–
OUT
DH–
OUT
VOX
DET
VOX
IN
LTS–
OUT
LRC–
OUT
CC
O
O
O
O
O
O
O
O
I
Half-wave rectification
Voice ON
(with no capacitor)
DC (with a capacitor)
Waveform
Pin 37 input
V
V
V
V
V
V
REF
REF
REF
REF
REF
REF
L · V
0V
– SN
– SN
– SN
– SN
– SN
– SN
CC
Ground :
•This is the ground pin for the
Logic power supply input :
V
•This is an open collector out-
•This pin goes high when voice
Loudspeaker link output :
•This is a link switch output to
•The output amplifier gain is
•Output impedance is 50
RF2 link output :
•This is a link switch output.
•Output impedance is 50 .
RF1 link output :
•This is a link switch output.
•Output impedance is 50 .
Intercom link output :
•This is a link switch output to
•Output impedance is 50 .
VOX detection control :
•A smoothing capacitor (C18)
VOX amp. input :
•VOX (voice detection) signals
•Input impedance is 500 .
Time stamp link output :
•This is a buffered link switch
•Output impedance is 50 .
Recording link output :
•This is a buffered link switch
•Output impedance is 50 .
logic circuits.
put.
signals are input to Pin 37.
an external loudspeaker ampli-
fier.
selectable between 12 and 0
dB.
30 .
an intercom.
and a resistor (R18) connect in
parallel to this pin to adjust
the attack and recovery times
of the VOX detector.
are input to this pin.
output.
output.
OX
detector output :
Description
From LINK SW
From LINK SW
From LINK SW
From LINK SW
37
10k
10k
10k
Equivalent circuit
500
Vref
Vref–PR
+
68k
+
+
90k
+
30k
+
0/12dB
31
Vref– SN
Vref – SN
Vref – SN
50k
50k
50k
36
35
32
500
33
34
38
39
VOX detection can be done
in two ways :
A) With small C18 (560
pF) and small R18 (39k )
B) With large C18 (22
k )
When address 2F of the
cross-point switch is
OFF, the output amplifi-
er gain is set to 12 dB.
VOX input
VOX output
VOX input
VOX output
F) and large R18 (100
AN6472NFBP
Remarks
13