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HC3-55536-9 Datasheet PDF : 1 Pages
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Low Bit Rate Voiceband Encoders/Decoders
Semiconductor
ECOMMENDENDS HC-55536 March 1993
NOT R EW DESIG Features
N • All Digital
FOR • Requires Few External Parts
Continuously Variable Slope
Delta-Demodulator (CVSD)
Description
The HC-55536 is a CMOS integrated circuit used to convert
serial NRZ digital data to an analog (voice) signal. Conver-
sion is by delta demodulation, using the Continuously
• Low Power Drain: 1.5mW from Single 3V to 6V Supply Variable Slope (CVSD) method of demodulation.
• 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.
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 The analog loop filters have been
replaced by digital filters which use very low power and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.
Ordering Information
PART
NUMBER
HC1-55536-5
HC1-55536-9
TEMP.
RANGE (oC) PACKAGE
0 to 75 14 Ld CERDIP
-40 to 85 14 Ld CERDIP
PKG. NO.
• Pagers/Satellites
HC3-55536-5
0 to 75 14 Ld PDIP
HC3-55536-9
-40 to 85 14 Ld PDIP
Pinout
HC-55536
(PDIP, CERDIP)
TOP VIEW
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
Functional Diagram
(13) (12)
FORCE ZERO
DIGITAL IN
3 BIT
SHIFT
REGISTER
ZO
1
SYLLABIC
DIGITAL
FILTER
4.0msec
6
DIGITAL
6
MODULATOR
+1
10 BIT
DAC
10
SIGNAL
ESTIMATE
DIGITAL FILTER
1.0msec
AOUT
(3)
CLOCK
(9)
VDD DIGITAL GND
(1)
(8)
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1997
4-252
File Number 2888.1
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