ADV7183AKST Analog Devices Inc, ADV7183AKST Datasheet - Page 31

• Manufacturer Part Number: ADV7183AKST
• Description: IC VIDEO DECODER NTSC 80-LQFP
• Manufacturer: Analog Devices Inc
• Type: Video Decoderr

Specifications of ADV7183AKST

• Applications: Projectors, Recorders, Security
• Voltage - Supply, Analog: 3.15 V ~ 3.45 V
• Voltage - Supply, Digital: 1.65 V ~ 2 V
• Mounting Type: Surface Mount
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 13. 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 15. NTSC Notch Filter Responses
2
2
2
Figure 14. Pal Notch Filter Responses
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 31 of 104
CHROMA FILTER
Data from the digital fine clamp block is processed by two 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 16 show the overall response of all filters.
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 in automatic mode, the widest filter is selected based
on the video standard/format and user choice (see settings 000
and 001 in Table 62).
Table 62. CSFM Function
CSFM[2:0]
000 (default)
001
010
011
100
101
110
111
Figure 16 shows the responses of SH1 (narrowest) to SH5
(widest) in addition to the wideband mode (in red).
Chroma Antialias Filter (CAA). The ADV7183A 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
ADV7183A