ADV7181BCP Analog Devices Inc, ADV7181BCP Datasheet - Page 39

• 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

AV CODE INSERTION AND CONTROLS
This section describes the I
•
•
•
•
Some of the decoded VBI data is being inserted during the
horizontal blanking interval. See the Gemstar Data Recovery
section for more information.
BT656-4 ITU Standard BT-R.656-4 Enable, Address 0x04 [7]
The ITU has changed the position for toggling of the V bit
within the SAV EAV codes for NTSC between revisions 3 and 4.
The BT656-4 standard bit allows the user to select an output
mode that is compliant with either the previous or the new
standard. For further information, review the standard at
http://www.itu.int.
The standard change affects NTSC only and has no bearing on
PAL.
Table 88. BT656-4 Function
BT656-4
0 (default)
1
Cr/Cb DATA BUS
Y DATA BUS
Insertion of AV codes into the data stream
Data blanking during the vertical blank interval (VBI)
The range of data values permitted in the output data
stream
The relative delay of luma vs. chroma signals
BT656-3 Spec: V bit goes low at EAV of Lines 10
and 273.
BT656-4 Spec: V bit goes low at EAV of Lines 20
and 283.
Description
FF
FF
16-BIT INTERFACE
AV CODE SECTION
SD_DUP_AV = 1
2
C-based controls that affect
00
00
00
00
AV
AV
Figure 18. AV Code Duplication Control
Cb
Y
Rev. B | Page 39 of 104
AV CODE SECTION
00
FF
16-BIT INTERFACE
SD_DUP_AV Duplicate AV Codes, Address 0x03 [0]
Depending on the output interface width, it may be necessary to
duplicate the AV codes from the luma path into the chroma path.
In an 8-bit-wide output interface (Cb/Y/Cr/Y interleaved data),
the AV codes are defined as FF/00/00/AV, with AV being the
transmitted word that contains information about H/V/F.
In this output interface mode, the following assignment takes
place: Cb = FF, Y = 00, Cr = 00, and Y = AV.
In a 16-bit output interface where Y and Cr/Cb are delivered via
separate data buses, the AV code is over the whole 16 bits. The
SD_DUP_AV bit allows the user to double up the AV codes, so
the full sequence can be found on the Y bus as well as
(= duplicated) the Cr/Cb bus. See Figure 18.
Table 89. SD_DUP_AV Function
SD_DUP_AV
0
1
VBI_EN Vertical Blanking Interval Data Enable,
Address 0x03 [7]
The VBI enable bit allows data such as intercast and closed
caption data to be passed through the luma channel of the
decoder with only a minimal amount of filtering. All data for
Lines 1 to 21 is passed through and available at the output port.
The ADV7181 does not blank the luma data, and automatically
switches all filters along the luma data path into their widest
bandwidth. For active video, the filter settings for YSH and YPK
are restored.
Refer to the BL_C_VBI Blank Chroma during VBI section for
information on the chroma path.
Table 90. VBI_En Function
VBI_EN
0 (default)
1
AV
00
Cb
Y
Description
AV codes in single fashion (to suit 8-bit
interleaved data output).
AV codes duplicated (for 16-bit interfaces).
Description
All video lines are filtered/scaled.
Only active video region is filtered/scaled.
SD_DUP_AV = 0
INTERLEAVED
Cb/Y/Cr/Y
FF
AV CODE SECTION
8-BIT INTERFACE
00
00
ADV7181
AV
Cb