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Data Sheet
THEORY OF OPERATION
KEY FEATURES
Analog front-end features include
ADV7800
The ADV7800 is a high quality, single-chip, multiformat 3D
comb filter video decoder, and graphics digitizer. Key features
of the device include
? Four 10-bit ADCs
?
?
Four 150 MHz, 10-bit ADCs that enable true 10-bit video
decoding
12-channel analog input mux that enables multiple source
connections without the requirement of an external mux
?
?
?
?
?
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NTSC/PAL/SECAM video decoder
Adaptive 3D comb filtering
3D digital noise reduction
Advanced frame time-base correction (TBC)
Composite, S-Video, YPrPb/RGB SCART support
YPrPb component HD and RGB graphics
input support
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?
?
?
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Four current and voltage clamp control loops that ensure
any dc offsets are removed from the video signal
SCART functionality and SD RGB overlay on CVBS
controlled by fast blank input
SCART source switching detection through FUNCT1 input
Four programmable antialias filters on standard definition
video signals and enhance definition
CVBS monitor output
? 30-bit digital YPrPb/RGB output supporting 10-bit deep
color
ANALOG FRONT END
The ADV7800 analog front end comprises four 10-bit ADCs
that digitize the analog video signal before applying it to the
SDP or CP.
The front end includes a 12-channel input mux that enables
multiple video signals to be applied to the ADV7800 without
the requirement of an external mux. Current and voltage clamps
are positioned in front of each ADC to ensure the video signal
remains within the range of the converter.
The ADCs are configured to run up to 4× oversampling mode
when decoding composite and S-Video inputs or components
up to 525i and 625i. 2× oversampling is available for 525p and
625p. All other video standards are 1× oversampled. In
oversampling the video signals, a reduction in the cost and
complexity of external antialiasing filters can be obtained with the
benefit of an increased signal-to-noise ratio (SNR).
Optional internal antialiasing filters with programmable
bandwidth are positioned in front of each ADC. These filters
can be used to band-limit standard definition video signals,
removing spurious, out-of-band noise.
The ADV7800 can support simultaneous processing of
CVBS and RGB standard definition signals to enable SCART
compatibility and overlay functionality. A combination of
CVBS and RGB inputs can be mixed and can be output under
the control of I 2 C registers and the fast blank pin.
STANDARD DEFINITION PROCESSOR
The standard definition processor (SDP) is capable of decoding
a large selection of baseband video signals in composite, S-Video,
and YUV formats. The video standards supported by the SDP
include PAL, PAL 60, PAL M, PAL N, PAL NC, NTSC M/J,
NTSC 4.43, and SECAM. The ADV7800 can automatically
detect the video standard and process it accordingly. The
ADV7800 can process video up to 525p/625p formats.
The SDP has a 3D temporal comb filter and a 5-line adaptive
2D comb filter that gives superior chrominance and luminance
separation when decoding a composite video signal. This highly
adaptive filter automatically adjusts its processing mode according
to the video standard and signal quality with no user interven-
tion required. The SDP has an IF filter block that compensates
for attenuation in the high frequency chroma spectrum due
to a tuner SAW filter. The SDP has specific luminance and
chrominance parameter controls for brightness, contrast,
saturation, and hue.
The ADV7800 implements a patented adaptive digital line length
tracking (ADLLT) algorithm to track varying video line lengths
from sources such as a VCR. ADLLT enables the ADV7800 to
track and decode poor quality video sources (such as VCRs)
and noisy sources (such as tuner outputs, VCRs, and camcor-
ders). Frame TBC ensures stable clock synchronization between
the decoder and the downstream devices to prevent disruptions.
The SDP also contains both a luma transient improvement
(LTI) and a chroma transient improvement (CTI) processor.
This processor increases the edge rate on the luma and chroma
transitions, resulting in a sharper video image.
Rev. C | Page 13 of 28
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