HC-55883

Features:

• This Circuit is Processed in Accordance to MIL-STD-883 and is Fully Conformant Under the Provisions of Paragraph 1.2.1.Requires Few External Parts
• All Digital
• Requires Few External Parts
• Low Power Drain
• Time Constants Determined by Clock Frequency; No Calibration or Drift Problems: Automatic Offset Adjustment
• Half Duplex Operation Under Digital Control
• Filter Reset Under Digital Control
• Automatic Overload Recovery
• Automatic "Quiet" Pattern Generation
• AGC Control Signal Available


Application

• Voice Transmission Over Data Channels (Modems)
• Voice/Data Multiplexing (Pair Gain)
• Voice Encryption/Scrambling
• Voicemail
• Audio Manipulations: Delay Lines, Time Compression, Echo Generation/Suppression, Special Effects, etc.
• Pagers/Satellites
• Data Acquisition Systems
• Voice I/O for Digital Systems and Speech Synthesis Requiring Small Size, Low Weight, and Ease of Reprogrammability


Pinout




Specifications

Voltage at Any Pin . . . . . . . . . . . . . . . . . . .GND -0.3V to VDD +0.3V
Maximum VDD Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6.0V
Minimum VDD Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . +3.2V
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+175
Storage Temperature Range . . . . . . . . . . . . . . . . . -65 to +150
Lead Temperature (Soldering 10s) . . . . . . . . . . . . . . . . . . . .+300
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .<2000V


Description

The HC-55564/883 is a half duplex modulator/demodulator CMOS intergrated circuit used to convert voice signals into serial NRZ digital data and to reconvert that data into voice.

The conversion is by delta-modulation, using the Continuously Variable Slope (CVSD) method of modulation/demodulation.While the signals are compatible with other CVSD circuits, the internal design is unique. The analog loop filters have been replaced by very low power digital filters which require no external timing components. This approach of  HC-55564/883  allows inclusion of many desirable features which would be difficult to implement using other approaches.

The fundamental advantages of delta-modulation, along with its simplicity and serial data format, provide an efficient (low data rate/low memory requirements) method for voice digitization. The  HC-55564/883  may be easily configured with the National TP3040 PCM/CVSD filter. The HC-55564/883 is usable from 9k bits/sec to above 64kbps. For more applications information, see Application Notes AN576 and AN607.