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HC1-55564-9 - Continuously Variable Slope Delta-Modulator (CVSD)

General Description

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.

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.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
Low Bit Rate Voiceband Encoders/Decoder Semiconductor February 1999 T UCT ROD ACEMEN 47 P E 7 T L OLE REP 00-442-7 OBS ENDED 8 M ns 1 .com COM pplicatio @harris E R NO ntral A entapp Ce : c Call or email HC-55564 Continuously Variable Slope Delta-Modulator (CVSD) Features • All Digital • Requires Few External Parts • Low Power Drain: 1.5mW Typical From Single 4.