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TW9903

Multi-standard Video Decoder With High Quality Down Scaler

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TW9903

TW9903 – NTSC/PAL/SECAM Analog to Digital Video

Decoder with High Quality Scaler

Introduction and Features

Techwell’s TW9903 is a high quality NTSC, PAL, and

SECAM video decoder plus high quality down scaler

designed for multimedia applications.

TW9903 uses the mixed-signal 3.3V CMOS

technology to provide a low-cost and low-power

integrated solution. Minimum external components

are required due to its integrated analog front -end

containing AGC, clamping, and three 8-bit high speed

ADCs. For composite inputs, an adaptive comb filter

and luma/chroma processing produce exceptionally

high quality pictures using proprietary techniques. A

high quality internal scaling engine offers arbitrarily

filtered down scaling of the output picture. A built-in

Closed-Caption decoder and VBI data pass-through

support data applications such Closed-Captioning and

Intercast™.

Analog Video Decoder

− NTSC (M, 4.34) and PAL (B, D, G, H, I, M, N, N

combination), PAL (60), SECAM with automatic format

detection

− Advanced synchronization processing for VCR fast

forward, backward, and pause mode

− Software selectable analog inputs allows any of the

following combinations:

− Up to four composite video inputs

− Three composite and one S-video inputs

− Two 8 -bit ADCs and analog clamping circuit.

− Fully programmable static gain or automatic gain control

for the Y or CVBS channel

− Programmable white peak control for the Y or CVBS

channel

− Video processing

− Switchable Notch or 2H comb filter Y/C separation

− PAL delay line for color phase error correction

− Image enhancement with programmable peaking.

− Digital sub-carrier PLL for accurate color decoding

− Digital Horizontal PLL and advanced synchronization

processing for non-standard video signals

− Programmable hue, brightness, saturation, and contrast.

− Automatic color control and color killer

− High quality horizontal and vertical filtered scaling with

arbitrary scale down ratio

− Detection of level of copy protection according to

Macrovision standard

Video Output

− Programmable output cropping

− VMI 1.4 compatible 8 -bit or 16-bit pixel interface

− ITU-R 601 or ITU-R 656 compatible output YCbCr(4:2:2)

output format

− Clos ed caption decoding

− VBI data pass through, raw ADC data for Intercast™

Miscellaneous

− Two wire MPU serial bus interface

− Power-down mode

− Typical power consumption 0.4W

− Single 27MHz crystal for all standards

− Supports 24.54MHz and 29.5MHz crystal for high

resolution square pixel format

− 5V tolerant I/O

− 3.3 V power supply

− 100-pinPQFPpackage

TECHWELL, INC.

3

REV. 0.92 ( B )

06/02/2002

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