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74VHC943N Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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74VHC943N Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 12 page TLF11679 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 b9 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 5V supply Y Drives 600X at b9 dBm Y All filters on chip Y Transmit level adjustment compatible with universal service order code Y TTL and CMOS compatible logic Y All inputs protected against static damage Y Low power consumption Y Full duplex answer or originate operation Y Analog loopback for self test Y Power down mode Y Direct Pin and function replacement for the 74HC943 Applications Y Built-in low speed modems Y Remote data collection Y Radio telemetry Y Credit verification Y Stand-alone modems Y Point-of-sale terminals Y Tone signaling systems Y Remote process control Commercial Package Number Package Description 74VHC943WM M20B 20-Lead Molded JEDEC SOIC (0300 Wide) 74VHC943N 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 TLF11679 – 1 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD-B30M125Printed in U S A |
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