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Introduction
The TVP5146 device is a high quality, single-chip digital video decoder that digitizes and
decodes all popular baseband analog video formats into digital component video. The TVP5146
decoder supports the analog-to-digital (A/D) conversion of component RGB and YPbPr signals,
as well as the A/D conversion and decoding of NTSC, PAL, and SECAM composite and S-video
into component YCbCr. This decoder includes four 10-bit 30-MSPS A/D converters (ADCs).
Preceding each ADC in the device, the corresponding analog channel contains an analog circuit
that clamps the input to a reference voltage and applies a programmable gain and offset. A total
of 10 video input terminals can be configured to a combination of RGB, YPbPr, CVBS, or
S-video video inputs.
Component, composite, or S-video signals are sampled at 2× the square-pixel or ITU-R BT.601
clock frequency, line-locked, and are then decimated to the 1× pixel rate. CVBS decoding
utilizes five-line adaptive comb filtering for both the luma and chroma data paths to reduce both
cross-luma and cross-chroma artifacts. A chroma trap filter is also available. On CVBS and
S-video inputs, the user can control video characteristics such as contrast, brightness,
saturation, and hue via an I
2
C host port interface. Furthermore, luma peaking (sharpness) with
programmable gain is included, as well as a patented chroma transient improvement (CTI)
circuit.
A built-in color space converter is applied to decoded component RGB data.
The following output formats can be selected: 20-bit 4:2:2 YCbCr or 10-bit 4:2:2 YCbCr.
The TVP5146 decoder generates synchronization, blanking, field, active video window,
horizontal and vertical syncs, clock, genlock (for downstream video encoder synchronization),
host CPU interrupt and programmable logic I/O signals, in addition to digital video outputs.
The TVP5146 decoder includes methods for advanced vertical blanking interval (VBI) data
retrieval. The VBI data processor (VDP) slices, parses, and performs error checking on teletext,
closed caption (CC), and other VBI data. A built-in FIFO stores up to 11 lines of teletext data,
and with proper host port synchronization, full-screen teletext retrieval is possible. The TVP5146
decoder can pass through the output formatter 2× the sampled raw luma data for host-based
VBI processing.
The decoder provides the option for concurrent processing of pixel-locked CVBS and
RGB/YPbPr input formats.
The main blocks of the TVP5146 decoder include:
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Robust sync detection for weak and noisy signals as well as VCR trick modes
Y/C separation by 2-D, 5-line, adaptive comb or chroma trap filter
Fast-switch input for pixel-by-pixel switching between CVBS and YPbPr/RGB component video inputs
(SCART support)
Four 10-bit, 30-MSPS A/D converters with analog preprocessors [clamp and automatic gain control
(AGC)]
Luminance processor
Chrominance processor
Macrovision is a trademark of Macrovision Corporation.
Gemstar is a trademark of Gemstar-TV Guide International.
PowerPAD is a trademark of Texas Instruments.
Other trademarks are the property of their respective owners.
SLES084C − August 2007
TVP5146
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TI [ TEXAS INSTRUMENTS ]
