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HC1-55564-5 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer HC1-55564-5
Beschreibung Continuously Variable Slope Delta-Modulator (CVSD)
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 9 Seiten
HC1-55564-5 Datasheet, Funktion
Low Bit Rate Voiceband Encoders/Decoder
February
Semiconductor
1999
NO
Call
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HC-55564
Continuously Variable
Slope Delta-Modulator (CVSD)
[ /Title
(HC-
55564
)
/Sub-
ject
(Con-
tinu-
ously
Vari-
able
Slope
Delta-
Modu-
lator
(CVS
D))
/
Autho
r ()
/Key-
words
(Har-
ris
Semi-
con-
ductor
, Tele-
com,
SLICs
,
SLAC
s,
Tele-
phone,
Tele-
phony,
Features
Description
• 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
Applications
• Voice Transmission Over Data Channels (Modems)
• Voice/Data Multiplexing (Pair Gain)
• Voice Encryption/Scrambling
• Voicemail
• Audio Manipulations: Delay Lines, Time Compression,
Echo Generation/Suppression, Special Effects, etc.
• Pagers/Satellites
• Data Acquisition Systems
• Voice I/O for Digital Systems and Speech Synthesis
Requiring Small Size, Low Weight, and Ease of
Reprogrammability
• Related Literature
- AN607, Delta Modulation for Voice Transmission
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 conver-
sion is by delta-modulation, using the Continuously Variable
Slope (CVSD) method of modulation/demodulation.
While the signals are compatible with other CVSD circuits, the inter-
nal design is unique. The analog loop filters have been replaced by
very low power digital filters which require no external timing compo-
nents. 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 HC-55564 is usable from 9kbits/s to above 64kbps. See the
Harris Military databook for a MIL-STD-883C compliant CVSD.
Application Note 607.
Ordering Information
PART
NUMBER
HC1-55564-2
HC1-55564-5
HC1-55564-9
HC3-55564-5
HC9P55564-5
TEMP.
RANGE (oC)
PACKAGE
PKG. NO.
-55 to 125 14 Ld CERDIP
F14.3
0 to 75 14 Ld CERDIP
F14.3
-40 to 85 14 Ld CERDIP
F14.3
0 to 75 14 Ld PDIP
E14.3
0 to 75 16 Ld Plastic SOIC (W) M16.3
Pinouts
HC-55564
(PDIP, CERDIP)
TOP VIEW
VDD 1
ANALOG GND 2
AOUT 3
AGC 4
AIN 5
NC 6
NC 7
14 DIG OUT
13 FZ
12 DIG IN
11 APT
10 ENC/DEC
9 CLOCK
8 DIG GND
HC-55564
(SOIC)
TOP VIEW
VDD 1
ANALOG GND 2
AOUT 3
AGC 4
AIN 5
NC 6
NC 7
NC 8
16 DIG OUT
15 FZ
14 DIG IN
13 APT
12 ENC/DEC
11 CLOCK
10 DIG GND
9 NC
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1999
1
File Number 2889.5






HC1-55564-5 Datasheet, Funktion
HC-55564
The following typical performance distortion graphs were
realized with the test configuration of Figure 7. The
measurement vehicle for Total Harmonic Distortion (THD)
was an HP-339A distortion measurement set, and for 2nd
and 3rd harmonic distortion, an HP-3582A spectrum
analyzer. All measurement conditions were at VDD = 5V, and
2nd and 3rd harmonic distortion measurements were C-
message filtered. 0dB = 1.2VRMS.
FUNCT.
GEN.
0.33µF
HC-55564 0.33µF
5 AIN AOUT 3
1 DEC/ 10
VDD
11
ENC
13 APT DGND 8
FZ 2
AGND
C-MES-
SAGE
FILTER
5V +1.0µF
HP3582A
SPECTRUM
ANALYZER
OR HP339A
DISTORTION
ANALYZER
-10
-20
THD
(dB)
-30
-40
-24
16KHz
32KHz
64KHz
30%
INPUT
FREQ. = 1kHz
10%
3%
-16 -8
INPUT SIGNAL LEVEL (dB)
1%
0
FIGURE 7. TEST AND MEASUREMENT CIRCUIT
FIGURE 8. CVSD SIGNAL LEVEL vs TOTAL HARMONIC
DISTORTION
CVSD INPUT LEVEL vs 2ND AND 3RD HARMONIC DISTORTION
C-MESSAGE WEIGHTED
-10
INPUT
-20 FREQUENCY 1kHz
3RD
16kHz CLOCK
-30 2ND
-40
-50
-24
-17 -11 -3.8
INPUT SIGNAL LEVEL (dB)
+3.0
FIGURE 9A.
CVSD SIGNAL TO 2ND AND 3RD HARMONIC DISTORTION
C-MESSAGE WEIGHTED
-10 VIN = 0.5VRMS
-20 16kHz CLOCK
-30 3RD
-40
-50
0
2ND
1000
2000
INPUT FREQUENCY (Hz)
3000
FIGURE 10A.
CVSD INPUT LEVEL vs 2ND AND 3RD HARMONIC DISTORTION
C-MESSAGE WEIGHTED
-10
INPUT
-20 FREQUENCY 1kHz
-30
32kHz CLOCK
3RD
-40 2ND
-50
-24
-17 -11 -3.8
INPUT SIGNAL LEVEL (dB)
+3.0
CVSD SIGNAL TO 2ND AND 3RD HARMONIC DISTORTION
C-MESSAGE WEIGHTED
-10
-20 VIN = 0.5VRMS
32kHz CLOCK
-30
-40 2ND
-50
-60
0
3RD
1000
2000
3000
INPUT FREQUENCY (Hz)
4000
FIGURE 9B.
FIGURE 10B.
CVSD INPUT LEVEL vs 2ND AND 3RD HARMONIC DISTORTION
C-MESSAGE WEIGHTED
-10
INPUT
-20 FREQUENCY 1kHz
64kHz CLOCK
-30
-40
-50
-24
2ND
-17 -11 -3.8
INPUT SIGNAL LEVEL (dB)
3RD
+3.0
CVSD SIGNAL TO 2ND AND 3RD HARMONIC DISTORTION
C-MESSAGE WEIGHTED
-10
-20
VIN = 0.5VRMS
64kHz CLOCK
-30
-40 2ND
-50
-60
0
3RD
1000
2000
3000
INPUT FREQUENCY (Hz)
4000
FIGURE 9C.
FIGURE 10C.
FIGURE 9. CVSD INPUT LEVEL vs 2ND AND 3RD HARMONIC
DISTORTION
FIGURE 10. CVSD INPUT FREQUENCY vs 2ND AND 3RD
HARMONIC DISTORTION
6

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