Description
The HC-55536 is a CMOS integrated circuit used to convert serial NRZ digital data to an analog (voice) signal. Conversion is by delta demodulation, using the Continuously Variable Slope (CVSD) method of demodulation.

Features
• All Digital
• Requires Few External Parts
• Low Power Drain: 1.5mW from Single 3V to 6V Supply
• Time Constants Determined by Clock Frequency; No Calibration or Drift Problems; Automatic Offset Adjustment
• Filter Reset by Digital Control
• Automatic Overload Recovery
• Automatic “Quiet” Pattern Generation

Applications
• Voice Decoder for Digital Systems and Speech Syntheses
• Voicemail
• Audio Manipulations; Delay Lines, Echo Generation/Suppression, Special Effects, etc.
• Pagers/Satellites