intersil HC-55564/883 handbook

HC-55564/883 is a half duplex modulator/demodulator CMOS integrated 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 The analog loop filters have been replaced by very low power digital filters which require no external timing components.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 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 device 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.


Brand: intersil

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Publication date: 06 August, 2012

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