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74VHC943NX PDF预览

74VHC943NX

更新时间: 2024-11-05 00:01:23
品牌 Logo 应用领域
美国国家半导体 - NSC 调制解调器
页数 文件大小 规格书
13页 158K
描述
300 Baud Modem (5V Supply)

74VHC943NX 数据手册

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PRELIMINARY  
October 1995  
74VHC943  
300 Baud Modem (5V Supply)  
General Description  
Features  
Y
5V supply  
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.  
Y
b
Drives 600X at 9 dBm  
Y
Y
All filters on chip  
Transmit level adjustment compatible with universal  
service order code  
The 74VHC943 utilizes advanced silicon-gate CMOS tech-  
nology. Switched capacitor techniques are used to perform  
analog signal processing.  
Y
Y
Y
Y
Y
Y
Y
TTL and CMOS compatible logic  
All inputs protected against static damage  
Low power consumption  
MODULATOR SECTION  
Full duplex answer or originate operation  
Analog loopback for self test  
The modulator contains a frequency synthesizer and a sine  
wave synthesizer. It produces a phase coherent frequency  
shift keyed (FSK) output.  
Power down mode  
Direct Pin and function replacement for the 74HC943  
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  
b
conversion and drive the line at a maximum of 9 dBm.  
Applications  
Y
Built-in low speed modems  
Y
Remote data collection  
DEMODULATOR SECTION  
Y
Radio telemetry  
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.  
Y
Credit verification  
Y
Stand-alone modems  
Y
Point-of-sale terminals  
Y
Tone signaling systems  
Y
Remote process control  
Commercial  
74VHC943WM  
74VHC943N  
Package Number  
M20B  
Package Description  
20-Lead Molded JEDEC SOIC (0.300 Wide)  
×
N20A  
20-Lead Molded DIP  
Note: Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter  
‘‘X’’ to the ordering code.  
Connection Diagram  
Pin Assignments for  
SOIC and PDIP  
TL/F/11679–1  
TRI-STATEÉ 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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