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HC-55536 Datasheet, PDF (1/1 Pages) Intersil Corporation – Continuously Variable Slope Delta-Demodulator (CVSD) | |||
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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 âQuietâ 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 The analog loop ï¬lters have been
replaced by digital ï¬lters which use very low power and
require no external timing components. This digital approach
allows inclusion of many desirable features, which otherwise
would be difï¬cult to implement. The device is usable from
9Kbits/s to above 64kbits/s, and may be easily conï¬gured
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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