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PDF HC1-55564-9 Data sheet ( Hoja de datos )
| Número de pieza | HC1-55564-9 | |
| Descripción | Continuously Variable Slope Delta-Modulator (CVSD) | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HC1-55564-9 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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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 The analog loop filters have been replaced by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
1 page  
HC-55564
Figures 4, 5, and 6 illustrate the typical frequency
response of the HC-55564 for varying input levels and for
varying sampling rates. To prevent slope overload (slew
limiting), the 0dB boundary should not be exceeded. The
frequency response is directly proportional to the sampling
clock rate. The flat bandwidth at 0dB doubles for every
doubling in sampling rate. The output levels were mea-
sured in the encode mode, without filtering, from AIN to
AOUT, at VDD = 5V. 0dB = 1.2VRMS.
AOUT
AIN
0dB = INPUT SIGNAL LEVEL
-6dB
-12dB
-18dB
-24dB
-30dB
-36dB
-10
-20
-30
-40
100
1000
10000
INPUT FREQUENCY AT AIN (Hz)
FIGURE 4. 16kbps
AOUT
AIN
0dB = INPUT SIGNAL LEVEL
-6dB
-12dB
-18dB
-24dB
-30dB
-36dB
100 1000
INPUT FREQUENCY AT AIN (Hz)
FIGURE 5. 32kbps
-10
-20
-30
-40
10000
AOUT
AIN
0dB = INPUT SIGNAL LEVEL
-6dB
-12dB
-18dB
-24dB
-30dB
-36dB
100 1000
INPUT FREQUENCY AT AIN (Hz)
FIGURE 6. 64kbps
5
-10
-20
-30
-40
10000
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HC1-55564-9.PDF ] | |
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