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74VHC943NX Datasheet

  • 74VHC943NX

  • 300 Baud Modem (5V Supply)

  • 158.58KB

  • 13頁

  • NSC

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74VHC943 300 Baud Modem (5V Supply)
PRELIMINARY
October 1995
74VHC943
300 Baud Modem (5V Supply)
General Description
The 74VHC943 is a full duplex low speed modem It pro-
vides a 300 baud bidirectional serial interface for data com-
munication over telephone lines and other narrow band-
width channels It is Bell 103 compatible
The 74VHC943 utilizes advanced silicon-gate CMOS tech-
nology Switched capacitor techniques are used to perform
analog signal processing
MODULATOR SECTION
The modulator contains a frequency synthesizer and a sine
wave synthesizer It produces a phase coherent frequency
shift keyed (FSK) output
LINE DRIVER AND HYBRID SECTION
The line driver and hybrid are designed to facilitate connec-
tion to a 600X phone line They can perform two to four wire
conversion and drive the line at a maximum of
b
9 dBm
DEMODULATOR SECTION
The demodulator incorporates anti-aliasing filters a receive
filter limiter discriminator and carrier detect circuit The
nine-pole receive filter provides 60 dB of transmitted tone
rejection The discriminator is fully balanced for stable
operation
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
5V supply
Drives 600X at
b
9 dBm
All filters on chip
Transmit level adjustment compatible with universal
service order code
TTL and CMOS compatible logic
All inputs protected against static damage
Low power consumption
Full duplex answer or originate operation
Analog loopback for self test
Power down mode
Direct Pin and function replacement for the 74HC943
Applications
Y
Y
Y
Y
Y
Y
Y
Y
Built-in low speed modems
Remote data collection
Radio telemetry
Credit verification
Stand-alone modems
Point-of-sale terminals
Tone signaling systems
Remote process control
Commercial
74VHC943WM
74VHC943N
Package Number
M20B
N20A
Package Description
20-Lead Molded JEDEC SOIC (0 300 Wide)
20-Lead Molded DIP
Note
Surface mount packages are also available on Tape and Reel Specify by appending the suffix letter
鈥樷€榅鈥欌€?to the ordering code
Connection Diagram
Pin Assignments for
SOIC and PDIP
TL F 11679 鈥?1
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 11679
RRD-B30M125 Printed in U S A

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