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HC-55564/883
FN3738.1
Continuously Variable Slope
Delta-Modulator (CVSD)
The HC-55564/883 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.
While the signals are compatible with other CVSD circuits,
the internal design is unique. The analog loop filters have
been replaced by very low power digital filters which require
no external timing components. This approach allows
inclusion of many desirable features which would be difficult
to implement using other approaches.
The fundamental advantages of delta-modulation, along with
its simplicity and serial data format, provide an efficient (low
data rate/low memory requirements) method for voice
digitization. The device may be easily configured with the
National TP3040 PCM/CVSD filter.
The HC-55564/883 is usable from 9k bits/sec to above
64kbps. For more applications information, see Application
Notes AN576 and AN607.
Features
鈥?This Circuit is Processed in Accordance to MIL-STD-883
and is Fully Conformant Under the Provisions of Para-
graph 1.2.1.Requires Few External Parts
鈥?All Digital
鈥?Requires Few External Parts
鈥?Low Power Drain
鈥?Time Constants Determined by Clock Frequency; No Cali-
bration or Drift Problems: Automatic Offset Adjustment
鈥?Half Duplex Operation Under Digital Control
鈥?Filter Reset Under Digital Control
鈥?Automatic Overload Recovery
鈥?Automatic 鈥淨uiet鈥?Pattern Generation
鈥?AGC Control Signal Available
Applications
鈥?Voice Transmission Over Data Channels (Modems)
鈥?Voice/Data Multiplexing (Pair Gain)
鈥?Voice Encryption/Scrambling
鈥?Voicemail
鈥?Audio Manipulations: Delay Lines, Time Compression,
Echo Generation/Suppression, Special Effects, etc.
鈥?Pagers/Satellites
鈥?Data Acquisition Systems
鈥?Voice I/O for Digital Systems and Speech Synthesis
Requiring Small Size, Low Weight, and Ease of Repro-
grammability
Ordering Information
PART
NUMBER
HC1-55564/883
HC4-55564/883
TEMPERATURE
RANGE
-55
o
C to +125
o
C
-55
o
C to +125
o
C
PACKAGE
14 Lead CerDIP
20 Lead Ceramic LCC
Pinouts
HC-55564/883
(CERDIP)
TOP VIEW
HC-55564/883
(CLCC)
TOP VIEW
NC
DIGITAL
OUT
FZ
1 20 19
18 DIGITAL IN
17 NC
16 APT
15 NC
14 ENCODE/DECODE
13 CLOCK
9 10 11 12
NC
NC
NC
DIGITAL
GND
V
DD
V
DD
1
ANALOG GND 2
A
OUT
3
AGC 4
A
IN
5
NC 6
NC 7
14 DIG OUT
13 FZ
12 DIG IN
11 APT
10 ENC/DEC
9 CLOCK
8 DIG GND
ANALOG GND
3
2
A
OUT
4
NC 5
AGC 6
NC 7
A
IN
8
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2002. All Rights Reserved
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