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The TW9920 is a multistandard video decoder and encoder chip that is designed for multimedia applications. This low power, integrated solution has a 4H comb filter based NTSC/PAL/SECAM video decoder that converts analog CVBS or S-Video signals into digital YCbCr output. The integrated analog video encoder converts digital YCbCr inputs into analog CVBS or S-Video output.

Key Features

• Video Decoder
• NTSC (M, 4.43) and PAL (B, D, G, H, I, M, N, N combination), PAL (60), SECAM support with automatic format detection
• Software selectable analog inputs allow any of the following combinations, e.g., 4 CVBS or (3 CVBS and 1 Y/C)
• Two 9-bit ADCs and analog clamping circuit
• Fully programmable static gain or automatic gain control for the Y channel
• Programmable white peak control for the Y or CVBS channel
• 4-H adaptive comb filter Y/C separation
• PAL delay line for color phase error correction
• Image enhancement with 2D peaking and CTI
• Digital subcarrier PLL for accurate color decoding
• Digital horizontal PLL for synchronization processing and pixel sampling
• Advanced synchronization processing and sync detection for handling nonstandard and weak signal
• Programmable hue, brightness, saturation, contrast, sharpness, Gamma control, and noise suppression
• Automatic color control and color killer
• Detection of level of copy protection according to Macrovision standard
• Programmable output cropping
• ITU-R 601 or ITU-R 656 compatible YCbCr(4:2:2) output format
• VBI slicer supporting industrial standard data services
• VBI data pass through, raw ADC data for Intercast™ Video Scaler
• High quality horizontal filtered scaling with arbitrary scale down ratio
• Phase accuracy better than 1/32 pixel
• Selectable antialias filter
• Vertical down scaling by line dropping Video Encoder
• Support NTSC/PAL and its substandard format output
• ITU-R 656 compatible video interface
• Luminance and chrominance filter
• Stable 27MHz crystal clock for subcarrier generation
• Five 10-bit digital-to-analog converters at 27MHz sample rate for generating CVBS or Y/C and YCbCr simultaneously Miscellaneous
• Two-wire MPU serial bus interface
• Power-down mode
• Field locked audio clock generation
• Typical power consumption 0.62W
• Single 27MHz crystal for all standards
• Supports 24.54MHz and 29.5MHz crystal for high resolution square pixel format decoding
• 3V tolerant I/O
• 2.5/3.3V power supply
• VFBGA package