參數(shù)資料
型號(hào)： AN6472NFBP
廠商： PANASONIC CORP
元件分類： 無(wú)繩電話/電話
英文描述： Cordless Telephone Speech Network IC Incorporating Cross-Point Switch
中文描述： TELEPHONE SPEECH CKT, PQFP64
封裝： 14 X 14 MM, PLASTIC, QFP-64
文件頁(yè)數(shù)： 14/19頁(yè)
文件大?。?/td> 216K
代理商： AN6472NFBP
14
ICs for Telephone
AN6472NFBP
40
41
42
43
44
45
46
47
48
49
50
51
I
O
I
I
I
O
I/O
I
O
O
HEAD
GND
ALC input :
Pin 45 connects through a
coupling capacitor to this pin.
Input impedance is 10k
.
ALC detection control :
A smoothing capacitor (C20) and a
resistor (R20) connect in parallel to
this pin to adjust the attack and
recovery times of the ALC.
Loudspeaker link input :
SP signals to this pin are output
through a coupling capacitor to the
link switch.
Input impedance is 50
k
.
Recording input :
Recording signals are input
through a coupling capacitor
to this pin.
Input impedance is normally
10k
. It decreases during
ALC operation.
Recording preamp. inverse input :
A/CR combination between Pin
45
and
this pin determines the gain and f. char-
acteristics of the recording preamplifier.
Recording preamp. output :
Outputs amplified recording
signals.
Output impedance is 50
.
Recording bias current control :
A C/R combination connected to this
pin determines the recording bias cur-
rent and gain of a recording head.
The smaller the resistance of the C/R
combination, the greater the bias cur-
rent and gain.
To recording head :
A recording head connects to
this pin.
EQ amp. inverse input :
A C/R combination between
Pin 49 and this pin determines
the equalizer characteristics.
EQ amp. output :
Outputs amplified equalizer
signals.
Output impedance is 50
.
REC/PLAY int. ref. voltage
output :
The Pin 5 ref. voltage is buf-
fered and output from this pin.
Output impedance is 50
Ground :
RD
PRE –
IN
RD
PRE –
NF
BIASS
ADJ
EQ.
NF
EQ.
OUT
REC
PRE –
OUT
V
REF
–
PR
ALC.
IN
ALC.
DET
SP –
IN
V
REF
– SN
V
REF
– SN
V
REF
– SN
V
REF
– PR
V
REF
– PR
V
REF
– PR
V
REF
– SN
Bias voltage
During recording0V
During playing
0V
Ground Pin 41 if no
ALC circuit is used.
The larger C20, the lon-
ger the attack time. The
smaller R20, the shorter
the recovery time
The gain (G) of the
recording preamplifier is
:
Address 07 of the cross-
point SW determines
the ON/OFF status of
the rec. preamp.
The bias current to the
head is :
The gain of the equaliz-
er amp. is calculted the
same way as the receiv-
er preamp.
Address OF of the cross-
point SW determines the
ON/OFF status of the EQ
amp.
48
Vref– PR
from
recording head
49
6
Vref
50
G = –
R22+j
ω
C23
R23
I
H
=
×
3
R25
V
REF-PR
V
REF-PR
=
V
reg
2
1
V
REF
(CONST)
2
1
Vref–PR
10k
from ALC
22k
43
I
Pin Descriptions (cont.)
Waveform
Description
Remarks
Pin No.
Pin name
I/O
Equivalent circuit
DC (with a capacitor)
Input
F(with no capacitor)
P
o
40
Vref – PR
2k
VRE G
41
42
Vref – SN
to LINK SW
50k
50k
44
45
VREG
61
47
46
45
–
+
–
+
–
+
–
+
–
+
–
+
–
+
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