[TECHWELL, INC.]

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 IntercastÔ.

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-pin PQFP package