Closed Circuit TV Digital
Video Codec
a
ADV611/ADV612
FEATURES
levels. The chips integrate glueless video and host interfaces
with on-chip SRAM to permit low part count, system level
implementations suitable for a broad range of applications.
The ADV611/ADV612 are 100% bitstream compatible with
the ADV601. The ADV611/ADV612 comes in a 120-lead
LQFP package.
Programmable “Quality Box”
Industrial Temperature Range (ADV612)
Hardware Frame Rate Reduction
100% Bitstream Compatible with the ADV601 and
ADV601LC
Precise Compressed Bit Rate Control
Field Independent Compression
8-Bit Video Interface Supports CCIR-656 and Multi-
plexed Philips Formats
General Purpose 16- or 32-Bit Host Interface with
512 Deep 32-Bit FIFO
The ADV611/ADV612 are video encoders/decoders optimized
for closed circuit TV (CCTV) applications. With the ADV611/
ADV612, you can define a portion of each video field to be at a
higher quality level relative to the rest of the field. This “quality
box” feature significantly increases compression of less impor-
tant background details, while retaining the image’s overall
context. Additionally, the unique subband coding architecture
of the ADV611/ADV612 offer many application-specific
advantages. A review of the General Theory of Operation and
Applying the ADV611/ADV612 sections will help you get the
most use out of the ADV611/ADV612 in any given application.
PERFORMANCE
Real-Time Compression or Decompression of CCIR-601
to Video:
720 ؋
288 @ 50 Fields/Sec — PAL
720 ؋
243 @ 60 Fields/Sec — NTSC
Compression Ratios from Visually Loss-Less to 7500:1
Visually Loss-Less Compression At 4:1 on Natural
Images (Typical)
The ADV611/ADV612 accept component digital video through
the Video Interface and outputs a compressed bitstream though the
Host Interface in Encode Mode. While in Decode Mode, the
ADV611/ADV612 accept compressed bitstream through the Host
Interface and outputs component digital video through the Video
Interface. The host accesses all of the ADV611/ADV612’s control
and status registers using the Host Interface. Figure 2 summarizes
the basic function of the part.
APPLICATIONS
CCTV Cameras and Systems
Time-Lapse Video Tape Recorders
Time-Lapse Video Disk Recorders
Wireless CCTV Cameras
Fiber CCTV Systems
(continued on page 2)
ANALOG
ADV7185
VIDEO
DECODER
SIGNAL
SERIAL
GENERAL DESCRIPTION
OR PARALLEL
ADV611/
ADV612
OR
ADSP-21xx
BITSTREAM FOR
TRANSMISSION
OR STORAGE
The ADV611/ADV612 are low cost, single chip, dedicated func-
tion, all-digital-CMOS-VLSI devices capable of supporting
visually loss-less to 7500:1 real-time compression and decom-
pression of CCIR-601 digital video at very high image quality
IMAGE
SENSOR
SIGNAL
DIGITIZER
QUALITY BOX CONTROLS
FROM REMOTE SITE
Figure 1. Typical Application
FUNCTIONAL BLOCK DIAGRAM
LOCATION, SIZE AND CONTRAST CONTROL
ADV611/
ADV612
ON-CHIP
TRANSFORM
SUBBAND STATISTICS
BUFFER
WAVELET
8
16/32
QUALITY
BOX
CONTROL
DIGITAL
VIDEO
I/O PORT
QUANTIZER
& ENTROPY
CODING
HOST
I/O PORT
& FIFO
COMPONENT
VIDEO I/O
FILTERS,
HOST
DECIMATOR &
INTERPOLATOR
DRAM
MANAGER
BIN WIDTH CONTROL
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 1999
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