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參數資料
| 型號： | MM74HC943 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 調制器/解調器 |
| 英文描述： | Low-Voltage Adjustable Precision Shunt Regulator 3-TO-92 -40 to 85 |
| 中文描述： | 0.3 kbps DATA, MODEM, PDIP20 |
| 文件頁數： | 3/8頁 |
| 文件大小： | 153K |
| 代理商： | MM74HC943 |
AC Electrical Characteristics
Unless otherwise specified, all specifications apply to the MM74HC943 over the range
b
40
§
C to
a
85
§
C using a V
CC
of
a
5V
g
10%, and a 3.579 MHz
g
0.1% crystal.
*
Symbol
Parameter
Conditions
Min
Typ
Max
Units
TRANSMITTER
F
CE
Carrier Frequency Error
4
Hz
Power Output
V
CC
e
5.0V
R
L
e
1.2 k
X
R
TLA
e
5490
X
b
12
b
10.5
b
9
dBm
2nd Harmonic Energy
R
TLA
e
5490
X
b
62
b
56
dBm
RECEIVE FILTER AND HYBRID
Hybrid Input Impedance
(Pins 15 and 16)
50
k
X
FTLC Output Impedance
5
10
50
k
X
Adjacent Channel Rejection
RXA2
e
GNDA, TXD
e
GND or V
CC
Input to RXA1
60
dB
DEMODULATOR (INCORPORATING HYBRID, RECEIVE FILTER AND DISCRIMINATOR)
Carrier Amplitude
b
48
b
12
dBm
Bit Jitter
SNR
e
30 dB
Input
e b
38 dBm
100
200
m
S
Baud Rate
e
300 Baud
(
Bit Bias
Alternating 1–0 Pattern
5
10
%
Carrier Detect Trip Points
CDA
e
1.2V
Off to On
b
45
b
42
b
40
dBm
V
CC
e
5.0V
On to Off
b
47
b
45
b
42
dBm
Carrier Detect Hystereisis
V
CC
e
5.0V
2
3
4
dB
AC Specification Circuit
TL/F/5349–3
3
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