ADV7181BCP Analog Devices Inc, ADV7181BCP Datasheet - Page 28

• 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

ADV7181
The luma shaping filter has three control registers:
•
•
•
In automatic mode, the system preserves the maximum possible
bandwidth for good CVBS sources (since they can successfully
be combed) as well as for luma components of YPrPb and YC
sources, since they need not be combed. For poor quality
signals, the system selects from a set of proprietary shaping
filter responses that complements comb filter operation in order
to reduce visual artifacts.
The decisions of the control logic are shown in Figure 10.
YSFM[4:0] Y Shaping Filter Mode, Address 0x17 [4:0]
The Y shaping filter mode bits allow the user to select from a
wide range of low-pass and notch filters. When switched in
automatic mode, the filter is selected based on other register
YSFM[4:0] allows the user to manually select a shaping
filter mode (applied to all video signals) or to enable an
automatic selection (depending on video quality and video
standard).
WYSFMOVR allows the user to manually override the
WYSFM decision.
WYSFM[4:0] allows the user to select a different shaping
filter mode for good quality CVBS, component (YPrPb),
and S-VHS (YC) input signals.
COMPLEMENT COMB
AUTO SELECT LUMA
SHAPING FILTER TO
BAD
SELECT WIDEBAND
FILTER AS PER
WYSFM[4:0]
QUALITY
VIDEO
Figure 10. YSFM and WYSFM Control Flowchart
1
YES
Rev. B | Page 28 of 104
WYSFMOVR
GOOD
YSFM IN AUTO MODE?
00000 OR 00001
SET YSFM
SELECT AUTOMATIC
WIDEBAND FILTER
selections, for example, detected video standard, as well as
properties extracted from the incoming video itself, for example,
quality, time base stability. The automatic selection always picks
the widest possible bandwidth for the video input encountered.
•
•
WYSFMOVR Wideband Y Shaping Filter Override,
Address 0x18 [7]
Setting the WYSFMOVR bit enables the use of the
WYSFM[4:0] settings for good quality video signals. For more
information, refer to the general discussion of the luma shaping
filters in the Y Shaping Filter section and the flowchart shown
in Figure 10.
Table 58. WYSFMOVR Function
WYSFMOVR
0
1 (default)
If the YSFM settings specify a filter (that is, YSFM is set to
values other than 00000 or 00001), the chosen filter is
applied to all video, regardless of its quality.
In automatic selection mode, the notch filters are only used
for bad quality video signals. For all other video signals,
wideband filters are used.
0
FILTER REGARDLESS FOR
GOOD AND BAD VIDEO
Enable manual override via WYSFM[4:0].
Description
Automatic selection of shaping filter for good
quality video signals.
USE YSFM SELECTED
NO