HC-55564 Overview
The HC-55564 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 patible with other CVSD circuits, the internal design is unique.
HC-55564 Key Features
- All Digital
- Requires Few External Parts
- Low Power Drain: 1.5mW Typical From Single 4.5V To 6V Supply
- 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