ADV7181BCP Analog Devices Inc, ADV7181BCP Datasheet - Page 30

• 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
Figure 12. Y S-VHS 18 Extra Wideband Filter (CCIR 601-Compliant)
–100
–120
–20
–40
–60
–80
–10
–20
–30
–40
–50
–60
–70
–10
–20
–30
–40
–50
–60
–70
0
0
0
0
0
0
COMBINED Y ANTIALIAS, CCIR MODE SHAPING FILTER,
Figure 14. NTSC Notch Filter Response
2
2
2
Figure 13. Pal Notch Filter Response
COMBINED Y ANTIALIAS, NTSC NOTCH FILTERS,
COMBINED Y ANTIALIAS, PAL NOTCH FILTERS,
4
4
4
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
Y RESAMPLE
Y RESAMPLE
Y RESAMPLE
6
6
6
8
8
8
10
10
10
12
12
12
Rev. B | Page 30 of 104
CHROMA FILTER
Data from the digital fine clamp block is processed by three sets
of filters. The data format at this point is CVBS for CVBS
inputs, chroma only for Y/C, or U/V interleaved for YPrPb
input formats.
•
•
•
The plots in Figure 15 show the overall response of all filters
together.
CSFM[2:0] C Shaping Filter Mode, Address 0x17 [7]
The C shaping filter mode bits allow the user to select from a
range of low-pass filters for the chrominance signal. When
switched into automatic mode, the widest filter is selected based
on the video standard/format and on user choice (see settings
000 and 001 in Table 61).
Table 61. CSFM Function
CSFM[2:0]
000 (default)
001
010
011
100
101
110
111
Figure 15 shows the responses of SH1 (narrowest) to SH5
(widest) in addition to the wideband mode (in red).
Chroma Anti-alias Filter (CAA). The ADV7181 over-
samples the CVBS by a factor of 2 and the Chroma/PrPb
by a factor of 4. A decimating filter (CAA) is used to
preserve the active video band and remove any out-of-
band components. The CAA filter has a fixed response.
Chroma Shaping Filters (CSH). The shaping filter block
(CSH) can be programmed to perform a variety of low-
pass responses. It can be used to selectively reduce the
bandwidth of the chroma signal for scaling or compression.
Digital Resampling Filter. This block is used to allow
dynamic resampling of the video signal to alter parameters
such as the time base of a line of video. Fundamentally, the
resampler is a set of low-pass filters. The actual response is
chosen by the system with no requirement for user
intervention.
Description
Autoselect 1.5 MHz bandwidth
Autoselect 2.17 MHz bandwidth
SH1
SH2
SH3
SH4
SH5
Wideband mode