ADV7181BCP Analog Devices Inc, ADV7181BCP Datasheet - Page 20

• Manufacturer Part Number: ADV7181BCP
• Description: IC VIDEO DECODER NTSC 64-LFCSP
• Manufacturer: Analog Devices Inc
• Type: Video Decoderr

Specifications of ADV7181BCP

• Applications: Recorders, Set-Top Boxes
• Voltage - Supply, Analog: 3.15 V ~ 3.45 V
• Voltage - Supply, Digital: 1.65 V ~ 2 V
• Mounting Type: Surface Mount
• Package / Case: 64-LFCSP
• Adc/dac Resolution: 9b
• Screening Level: Industrial
• Package Type: LFCSP EP
• Pin Count: 64
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: EVAL-ADV7181BEB - BOARD EVALUATION FOR ADV7181
• Lead Free Status / RoHS Status: Compliant, Contains lead / RoHS non-compliant

ADV7181B
SYNC PROCESSING
The ADV7181B extracts syncs embedded in the video data
stream. There is currently no support for external HS/VS
inputs. The sync extraction has been optimized to support
imperfect video sources such as VCRs with head switches. The
actual algorithm used employs a coarse detection based on a
threshold crossing followed by a more detailed detection using
an adaptive interpolation algorithm. The raw sync information
is sent to a line-length measurement and prediction block. The
output of this is then used to drive the digital resampling
section to ensure that the ADV7181B outputs 720 active pixels
per line.
The sync processing on the ADV7181B also includes the
following specialized postprocessing blocks that filter and
condition the raw sync information retrieved from the digitized
analog video:
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VBI DATA RECOVERY
The ADV7181B can retrieve the following information from the
input video:
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The ADV7181B is also capable of automatically detecting the
incoming video standard with respect to
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The ADV7181B can configure itself to support PAL-B/G/H/I/D,
PAL-M/N, PAL-combination N, NTSC-M, NTSC-J, SECAM
50 Hz/60 Hz, NTSC4.43, and PAL60.
Vsync Processor. This block provides extra filtering of the
detected Vsyncs to improve vertical lock.
Hsync Processor. The Hsync processor is designed to filter
incoming Hsyncs that are corrupted by noise, providing
much improved performance for video signals with stable
time base but poor SNR.
Wide-screen signaling (WSS)
Copy generation management system (CGMS)
Closed captioning (CC)
Macrovision protection presence
EDTV data
Gemstar-compatible data slicing
Color subcarrier frequency
Field rate
Line rate
Rev. B | Page 20 of 100
GENERAL SETUP
Video Standard Selection
The VID_SEL[3:0] register allows the user to force the digital
core into a specific video standard. Under normal circumstances,
this should not be necessary. The VID_SEL[3:0] bits default to
an autodetection mode that supports PAL, NTSC, SECAM, and
variants thereof. The Autodetection of SD Modes section
provides more information on the autodetection system.
Autodetection of SD Modes
To guide the autodetect system of the ADV7181B, individual
enable bits are provided for each of the supported video
standards. Setting the relevant bit to 0 inhibits the standard
from being detected automatically. Instead, the system picks the
closest of the remaining enabled standards. The results of the
autodetection block can be read back via the status registers. See
the Global Status Registers section for more information.
VID_SEL[3:0]Address 0x00[7:4]
Table 17. VID_SEL Function
VID_SEL[3:0]
0000 (default)
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
AD_SEC525_EN Enable Autodetection of SECAM 525
Line Video, Address 0x07 [7]
Setting AD_SEC525_EN to 0 (default) disables the
autodetection of a 525-line system with a SECAM style, FM-
modulated color component.
Setting AD_SEC525_EN to 1 enables the detection.
Description
Autodetect (PAL BGHID) <–> NTSC J
(no pedestal), SECAM.
Autodetect (PAL BGHID) <–> NTSC M
(pedestal), SECAM.
Autodetect (PAL N) (pedestal) <–> NTSC J
(no pedestal), SECAM.
Autodetect (PAL N) (pedestal) <–> NTSC M
(pedestal), SECAM.
NTSC J (1).
NTSC M (1).
PAL60.
NTSC 4.43 (1).
PAL BGHID.
PAL N = PAL BGHID (with pedestal).
PAL M (without pedestal).
PAL M.
PAL-Combination N.
PAL-Combination N (with pedestal).
SECAM.
SECAM (with pedestal).