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| Low Bit Rate Voiceband Encoders/Decoders Semiconductor March 1993 Features * All Digital * Requires Few External Parts DED N Continuously Variable Slope ME OM NS Delta-Demodulator (CVSD) REC DESIG T Description NO NEW FOR 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. While signals are compatible with other CVSD circuits, the internal design is unique. The analog loop filters have been replaced by digital filters which use very low power and require no external timing components. This digital approach allows inclusion of many desirable features, which otherwise would be difficult to implement. The device is usable from 9Kbits/s to above 64kbits/s, and may be easily configured with the HC-55564 CVSD for a complete transmit/receive voice channel. HC-55536 * 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 Ordering Information PART NUMBER HC1-55536-5 HC1-55536-9 HC3-55536-5 HC3-55536-9 TEMP. RANGE (oC) 0 to 75 -40 to 85 0 to 75 -40 to 85 PACKAGE 14 Ld CERDIP 14 Ld CERDIP 14 Ld PDIP 14 Ld PDIP PKG. NO. Pinout HC-55536 (PDIP, CERDIP) TOP VIEW Functional Diagram (13) (12) FORCE ZERO DIGITAL IN VDD 1 NC 2 AOUT 3 NC 4 NC 5 NC 6 NC 7 14 NC 13 FZ 12 DIGITAL INPUT 11 NC 10 NC 9 CLOCK 8 DIGITAL GND ZO 10 BIT DAC 10 SIGNAL ESTIMATE DIGITAL FILTER 1.0msec 3 BIT SHIFT REGISTER 1 SYLLABIC DIGITAL FILTER 4.0msec 6 DIGITAL MODULATOR +1 6 AOUT (3) CLOCK (9) VDD (1) DIGITAL GND (8) CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright (c) Harris Corporation 1997 File Number 2888.1 4-252 |
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