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74VHC943WMX Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza 74VHC943WMX
Descripción Electrónicos  300 Baud Modem (5V Supply)
Download  12 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

74VHC943WMX Datasheet(HTML) 6 Page - National Semiconductor (TI)

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AC Electrical Characteristics
Unless otherwise specified all specifications apply over the range b40 Cto a85 C using a VCC of a5V g10% and a
3579 MHz g01% crystal
Symbol
Parameter
Conditions
Min
Typ
Max
Units
TRANSMITTER
FCE
Carrier Frequency Error
4Hz
Power Output
VCC e 50V
RTLA e 5490X
b
12
b
105
b
9
dBm
RL e 12 kX
2nd Harmonic Energy
RTLA e 5490X
b
62
b
56
dBm
RECEIVE FILTER AND HYBRID
Hybrid Input Impedance
50
kX
(Pins 15 and 16)
FTLC Output Impedance
5
10
50
kX
Adjacent Channel Rejection
RXA2 e GNDA TXD e GND or VCC
60
dB
Input to RXA1
DEMODULATOR (INCORPORATING HYBRID RECEIVE FILTER AND DISCRIMINATOR)
Carrier Amplitude
b
38
b
12
dBm
Bit Jitter
SNR e 30 dB
Input eb38 dBm
100
200
m
s
Baud Rate e 300 Baud
(
Bit Bias
Alternating 1 – 0 Pattern
5
10
%
Carrier Detect Trip Points
CDA e 12V
Off to On
b
38
b
36
b
34
dBm
VCC e 50V
On to Off
b
41
b
39
b
37
dBm
Carrier Detect Hystereisis
VCC e 50V
2
3
4
dB
The demodulator specifications apply to the 74VHC943 operating with a modulator having frequency accuracy phase jitter and harmonic content equal to or
better than the 74VHC943 modulator
AC Specification Circuit
TLF11679 – 3
6


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