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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)： | 6/11頁 |
| 文件大?。?/td> | 156K |
| 代理商： | AN6448NFBP |
28
I
DATA
29
30
GND
L –
V
CC
VOX.
OUT
O
31
32
SP.
OUT
DH –
OUT
VOX
DET
O
O
O
I
RF2 –
OUT
O
33
RF1 –
OUT
O
34
35
36
VOX
IN
37
Data input :
Serial data is input to this pin.
Data is read into the internal
shift register in synchroniza-
tion with clock signals.
Ground :
This is the ground pin for the
logic circuits.
VOX detector output :
This is an open collector out-
put.
This pin goes low when voice
signals are input to Pin37.
Loudspeaker link output :
This is a link switch output to
an
external
amplifier.
The output amplifier gain is
selectable between 12 and 0dB.
Output impedance is 50
±
30
.
loudspeaker
Output waveforms are shaped
stable internally (by the threshold
circuit).
When address 2F of the cross-
point switch is OFF, the output
amplifier gain is set to 12 dB.
Logic power supply input :
RF2 link output :
This is a link switch output.
Output impedance is 50
±
30
.
Intercom link output :
This is a link switch output to
a intercom.
Output impedance is 50
±
30
.
VOX detection control :
A smoothing capacitor (C17) and a
resistor (R19) connect in parallel to
this pin to adjust the attack and
recovery times of the VOX detec-
tor.
VOX amp. input :
VOX (voice detection) signals are
input to this pin.
Input impedance is 500
.
VOX detection can be done
in two ways :
A) With small C17 (560pF)
and small R19 (39k
)
VOX input
VOX output
B) With large C17 (22
μ
F)
and large R19 (100k
)
VOX input
VOX output
Input sensitivity is calculat-
ed as follows :
Adjust the f. characteristics
and sensitivity based on the
above calculation.
G =
R2//ZC1
R1
Description
Waveform
Remarks
PinNo.
Symbol
I/O
Equivalent Circuit
RF1 link output :
This is a link switch output.
Output impedance is 50
±
30
.
300k
V
CC
10k
28
31
68k
10k
50k
33
34
V
REF
32
30k
10k
50k
LINK
From LINK SW
LINK
From LINK SW
0/12dB
V
REF
V
REF
90k
10k
50k
35
LINK
From LINK SW
V
REF
500
500
R1
R2
C1
36
37
V
REF
5V
0V
V
CC
0V
Voice on
V
REF
V
REF
V
REF
V
REF
Half-wave rectification
(with no capacitor)
DC (with a capacitor)
Pin36
+
–
+
–
+
–
+
–
I
Pin Descriptions (cont.)
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