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TW8836 Schematic ( PDF Datasheet ) - Intersil

Teilenummer TW8836
Beschreibung LCD Video Processor
Hersteller Intersil
Logo Intersil Logo 




Gesamt 46 Seiten
TW8836 Datasheet, Funktion
Techwell
LCD Video Processor with Built-in Decoder, Triple
ADCs, LVDS & TTL Inputs, MCU, OSD, TCON and LVDS
panel interface
TW8836
The TW8836 is a highly integrated LCD video processor
that incorporates many of the features required to
create a multi-purpose LCD display system into a single
package. This includes a high quality 2D comb
NTSC/PAL/SECAM video decoder, triple high speed RGB
ADCs, an LVDS and TTL digital input interface, high
quality scaler and de-interlacer, as well as a versitile
OSD, high performance MCU, and LVDS or TTL output
panel interface. The TW8836 can support input
resolutions up to 1080p and can drive LCD panels at
resolutions up 1366 x 768. The TW8836’s video
processing capability includes arbitrary H/V scaling,
panoramic scaling, image mirroring, image adjustment
and enhancement, black and white stretch, etc. The
feature set and versatility of this device makes it an
ideal solution for in-car LCD display applications, as well
as portable display applications such as Pico Projectors.
Applications
x In-car display
x Pico Projector & Portable media player
x Portable DVD and DVR players
Analog Video Decoder
x NTSC (M, 4.43) and PAL (B, D, G, H, I, M, N, N
combination), PAL (60), SECAM with automatic format
detection
x Three 10-bit ADCs and analog clamping circuit.
x Fully programmable static gain or automatic gain
control for the Y or CVBS channel
x Programmable white peak control for the Y or CVBS
channel
x Software selectable analog inputs allows composite,
S-video, analog YPbPr or RGB
x High quality adaptive 2D comb filter for both NTSC
and PAL inputs
x PAL delay line for color phase error correction
x Image enhancement with 2D dynamic peaking / CTI.
x Digital sub-carrier PLL for accurate color decoding
x Programmable hue, brightness, saturation, contrast,
sharpness
x Selectable differential or single-ended CVBS input
x Digital horizontal PLL and Advanced synchronization
processing for VCR playback and weak signal
performance
x High quality horizontal and vertical filtered down
scaling with arbitrary scale down ratio
x Up to 2CH differential or 4CH single ended CVBS input
Analog RGB Inputs
x Triple high speed 10-bit ADCs with clamping and
programmable gain amplifier
x SOG and H/V sync support for YPbPr or RGB input
x Built-in line locked PLL with sync separator
x Supports input resolution up to 1080p
Digital Inputs Support
x Supports both BT656 and 601 video formats
x Supports YCbCr/RGB 24-bit input (bi-directional) up to
1080p resolution
x Single channel LVDS input up to 720p resolution
x Supports RGB 565 + BT 656 at the same time
TFT Panel Support
x Built-in programmable timing controller
x Supports 3, 4, 6 or 8 bits per pixel up to 16.8 million
colors with built-in dithering engine
x Supports digital panels (TTL) or single channel LVDS
panels up to WXGA (1366 x 768) resolution, 85MHz
x Supports Serial (8-bit) RGB panel
Font Based On Screen Display
x Eight window font OSD with bordering / shadow
x 10KB programmable font RAM and 512 display RAM
x 1/2/3/4 bits/pixel
x Supports variable width (12/16), height (2~32)
SPI Flash Based On Screen Display
x 9 bitmap based OSD windows in 2 layers through SPI
with alpha blending between layers
x Supports 4/6/8 bits/pixel
x Supports RLE decompression for two windows
FNXXXX
May 17, 2012
1
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.






TW8836 Datasheet, Funktion
TW8836
Analog Front-end
The analog front-end converts analog video signals to the required digital format. Each channel contains an automatic
clamping circuit, AGC circuit, anti-aliasing filter and high performance ADCs to minimize the number of external
components needed. The clamping circuit restores the signal DC level so it can be properly digitized. The analog inputs
source selections are software programmable. Different input sources have different signal conditioning logic to properly
convert the signal into correct format for further processing.
Video Decoder
SYNC PROCESSOR
The decoder sync processor of the video input detects horizontal synchronization and vertical synchronization signals in
the composite video or in the Y signal of an S-Video input. The processor contains a digital phase-locked-loop (PLL) and
decision logic to achieve reliable sync detection in both stable signals as well as in unstable signals, such as those from
VCR fast forward or rewind.
HORIZONTAL SYNC PROCESSING
Horizontal synchronization processing contains a sync separator, a phase-locked-loop (PLL), and the related decision
logic.
The horizontal PLL locks onto the extracted horizontal sync in all conditions to provide a jitter free output image. From
there, the PLL also provides orthogonal sampling raster for the down-stream processor. It has a very wide lock-in range
for tracking any non-standard video signal.
VERTICAL SYNC PROCESSING
The vertical sync separator detects the vertical synchronization pattern in the input video signals. A detection window
controls the sync determination to provide a more reliable synchronization and simulates the functionality of a PLL
without the complexity of a PLL. The field status is determined at the vertical synchronization time based on the vertical
and horizontal sync relationship.
COLOR DECODING
Y/C SEPARATION
The color-decoding block contains the luma / chroma separation engine for composite video signals and multi-standard
color demodulation. For NTSC and PAL standard signals, the luma / chroma separation can be done either by comb filter
or notch/band-pass filter combination. For SECAM standard signals, only notch/band-pass filter is available. The default
selection for NTSC/PAL is comb filter. The characteristics of the band-pass filter can be found in the filter curve section.
In the case of comb filter, the decoder separates luma (Y) and chroma (C) of a NTSC/PAL composite video signal using a
proprietary adaptive comb filter algorithm. It leads to good Y/C separation with minimal cross luma and cross color at
both horizontal and vertical edges. Due to the nature of the line buffer used in the comb filter, there is always a two line
processing delay in the output images regardless of what standard or filter option is chosen.
COLOR DEMODULATION
The color demodulation for NTSC and PAL standards are done by quadrature mixing of the chroma signal to the base
band and extracting the chroma components with the low-pass filter. The low-pass filter characteristics can be selected
for optimized transient color performance. For the PAL system, the PAL ID or the burst phase switching is identified to aid
the PAL color demodulation.
The SECAM color demodulation process consists of bell filtering, FM demodulation, and de-emphasis filtering. The
chroma carrier frequency is identified in the process and used to control the SECAM color demodulation.
The sub-carrier signal used in the color demodulator is generated by a direct digital synthesis PLL that locks onto the
input sub-carrier reference (color burst). This arrangement allows any sub-standard NTSC or PAL signal to be
demodulated easily.
AUTOMATIC CHROMA GAIN CONTROL
The Automatic Chroma Gain Control (ACC) compensates for reduced amplitudes caused by transmission loss in the video
signal. In the NTSC/PAL standards, the color reference signal is the burst on the back porch. This color-burst amplitude is
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TW8836 pdf, datenblatt
LVDS COLOR MAPPING
TW8836 is able to control the output color order.
TW8836
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