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參數(shù)資料
| 型號(hào)： | AN6448NFBP |
| 廠商： | PANASONIC CORP |
| 元件分類： | 無(wú)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(yè)數(shù)： | 4/11頁(yè) |
| 文件大小： | 156K |
| 代理商： | AN6448NFBP |
I
Pin Descriptions
1 GND
2 V
L
I
3
ST
V
–
CONT
I
O
4
V
REF
–
SN
HCO
HCC
APC
Vreg-R · I
I
L
T–
FILTER
5 V
REF
O
O
O
I
I
O
O
O
6
7
23
8
9
10 RV IN
RV
PRE
–
OUT
RV
FILTER
RV
OUT
(1)
RV
OUT
(2)
11
12
13
·
14
Description
Waveform
Remarks
PinNo.
Symbol
I/O
Equivalent Circuit
TO
2
3
62
7
30k
120k
+
–
+
–
23
4
8
6k
9
I
χ
I
L
I
10
11
+
–
+
–
10k
11
13
14
12
61
5
6
24k
24
k
Vreg
+
–
+
–
0V
DC
3 to 10V
DC
0.3V
DC1V
1V
(Const)
1V
(Const)
I
L
DC1V
V
REF
V
REF
V
REF
V
REF
V
REF
V
CC
0V
Hold-reset signal
Ground :
This is the ground pin for the
speech network.
GND for REC/PLY, VRER
SPEECH and LINK.
Side-tone adjustment :
Grounded through R1 (27
).
Connects to the side-tone adjust-
ing circuit to adjust side tone and
receiver level.
Int. ref. voltage output (1) :
Outputs half the Vreg reference
voltage.
Grounded through a 0.01
μ
F
capacitor.
Line voltage control (1) :
C
and the internal resistance
determine the f. characteristics.
The larger the capacitance
of C10, the lower the high
band gain as with a LPF.
The larger the capacitance of
C
5
, the wider the pulse width.
C6 and the 6-k
internal
resistance as illustrated on the
left form a low-pass filter.
The receiver preamplifier
gain (G) is :
The line drive gain (G) is :
G =
//Z
Tel
R
Also assuming
Z
Line
600
Z
Tel
600
R
1
:
G=20log 300
Int. ref. voltage output (2) :
Output impedance=50
Line power input :
Connects to the positive output
of the diode bridge.
Hold-reset control :
Grounded through C5. Adjusts
the output time of control sig-
nals.
Hold-reset signal output :
This is an open-collector out-
put to a microprocessor.
Requires a pull-up resistor.
Trans. preamp. output :
C
as connected between this pin
and the ground forms a low-pass
filter.
Auto. PAD control :
Connects through a resistance to
Pin61 (Vreg). If the resistance
increases, the PAD operates
closer to the near end. If the
resistance decreases, the PAD
operates closer to the far end.
Rec. preamp. input :
Receiver signals are input from
the side-tone circuit to this pin.
R7 and C8 connected between
Pin11 and this pin determine
Rec. preamp. output :
R7 and C8 connected between
Pin10 and this pin determine
the f. characteristics.
The output impedance is 100
±
50
.
Rec. amp. outputs (1 and 2) :
A ceramic or dynamic receiv-
er is connected.
The output circuit is a BTL con-
figuration.
The output impedance is 50
±
30
.
Rec. amp. input :
G= –20log
1
ω
C8
ω
C9
R6 +
1
1
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