描述 Description

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.

特性 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