[Techwell, Inc.]

Introduction and Features
The TW280X includes four high quality NTSC/ PAL video decoders, which convert analog composite to digital component YCbCr for security application. The TW280X contains four 10-bit A/D and proprietary digital gain/clamp controllers and utilizes proprietary techniques for separating luminance & chrominance to reduce both crossluminance and cross-chrominance artifacts. The high performance dual scalers in each channel offer two differently scaled video outputs with 54MHz ITU-R BT.656 format for security system design. Four built-in motion detectors can also increase the feature of security system.

Features
− Accepts all NTSC (M/N/4.43) / PAL (B/D/G/H/I/K/L/M/N/60) standard formats with auto detection
− Four 10-bit video CMOS analog to digital converters
− Adjust video level with proprietary automatic clamp and gain control system
− Proprietary architecture for locking to weak, noisy, or unstable signals
− High performance adaptive comb filters for all NTSC/PAL standards
− IF compensation filter for improvement of color demodulation
− PAL delay lines for correcting PAL phase errors
− Programmable hue, saturation, contrast, brightness and sharpness
− Dual high quality horizontal and vertical down scaler for each channel
− Four built-in motion detectors for security system
− Supports the standard ITU-R BT.656 / 8bit ITU-R BT.601 format
− Supports two differently scaled output mode with 54MHz ITU-R BT.656 format
− Supports a two-wire serial or parallel interface
− Low power consumption
− 128 PQFP package

Applications
   Security systems