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參數(shù)資料
| 型號： | AN6448NFBP |
| 廠商： | PANASONIC CORP |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | CAP 120PF 50V CERAMIC MONO 5% |
| 中文描述： | TELEPHONE SPEECH CKT, PQFP64 |
| 封裝： | 14 X 14 MM, PLASTIC, QFP-64 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 156K |
| 代理商： | AN6448NFBP |
40IN
I
41DET
O
42IN
I
43
RD
PRE –
IN
I
44
RD
PRE –
NF
I
45
REC
PRE –
OUT
O
46ADJ
48NF
I
49OUT
O
50V
REF
–
PR
O
47 HEAD I/O
ALC input :
Pin45 connects through a cou-
pling capacitor to this pin.
Input impedance is 10k
.
Ground Pin41 if no ALC cir-
cuit is used.
The larger C20, the longer the
attack time. The smaller R22,
the shorter the recovery time.
Address 07 of the cross-point
SW determines the ON/OFF
status of the rec. preamp.
The bias current to the head
is :
I
H
= Vref
×
3
2
V
ref
= 1
REG
The gain of the equalizer amp.
is calculated the same way as
the receiver preamp.
Address 0F of the cross-point
SW determines the ON/OFF
status of the EQ amp.
The gain (G) of the recording
preamplifier is :
R26
R24 +
ω
C23
G = –
ALC detection control :
A smoothing capacitor (C20) and a
resistor (R22) 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 50k
.
Recording input :
Recording signals are input
through a coupling capacitor
to this pin.
Input impedance is normally 10
k
. It decreases during ALC
operation.
Recording preamp. inverse input :
A C/R combination between Pin45 and
this pin determines the gain and f. charac-
teristics of the recording preamplifi
er.
Recording preamp. output :
Outputs amplified recording sig-
nals.
Output impedance is 50
±
30
.
To recording head :
A recording head connects to
this pin.
EQ amp. inverse input :
A C/R combination between
pin49 and this pin determines
the equalizer characteristics.
EQ amp. output :
Outputs amplified equalizer sig-
nals.
Output impedance is 50
±
30
.
REC/PLAY int. ref. voltage
output :
The pin5 ref. voltage is buf-
fered and output from this
pin.
Recording bias current control :
A C/R combination connected to this pin
determines the recording bias current and
gain of a recording head.
The smaller the resistance of the C/R combi-
nation, the greater the bias current and gain.
1
Full-wave
rectification
(with no capacitor)
V
REF
V
REF
V
REF
V
REF
V
REF
During recording
During playing
Bias voltage
0V
0V
V
REF
V
REF
V
REF
(CONST)
2k
V
CC
40
41
V
REF
LINK
To LINK SW
50k
42
V
REF
From ALC
22k
10k
10k
V
REF
43
44
45
V
CC
R27
45
61
47
46
From recording
head
48
49
V
REF
50
5
V
REF
O
O
LTS –
OUT
LRC –
OUT
38
39
Time stamp link output :
This is a buffered link switch
output.
Output impedance is 50
±
30
.
Description
Waveform
Remarks
PinNo.
Symbol
I/O
Equivalent Circuit
Recording link output :
This is a buffered link switch
output.
Output impedance is 50
±
30
.
1
2
38
39
V
REF
V
REF
DC (with a capacitor)
Pin$1
Input
LINK
To LINK SW
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
I
Pin Descriptions (cont.)
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