Featureseatures

 The TW9900 is Techwell’s next generation low-cost multi-standard video

decoder chip that is designed for portable applications. It consumes less

than 100mW in typical composite input application. The available power

down mode further reduces the power consumption. It uses the 1.8V for

both analog and digital supply voltage and 3.3V for I/O power. A single

27MHz crystal is all that needed to decode all analog video standards.

The video decoder decodes the base-band analog CVBS or S-video signals

into digital 8-bit 4:2:2 YCbCr for output. It consists of analog front-end

with input source selection, variable gain ampli_er and analog-to-digital

converters, Y/C separation circuit, multi-standard color decoder (PAL

BGHI, PAL M, PAL N, combination PAL N, NTSC M, NTSC 4.43 and SECAM)

and synchronization circuitry. The Y/C separation is done with high quality

adaptive 4H comb _lter for reduced cross color and cross luminance. The

advanced synchronization processing circuitry can produce stable pictures

for non-standard signal as well as weak signal. The output of

the decoder is line-locked and formatted to the ITU-R 656 output with

embedded sync.

The TW9900 also includes circuits to detect and process vertical blanking

interval (VBI) signal. It slices and process VBI data for output through video

bus. Some information can also be alternatively retrieved through host

interface. It also detects copy-protected signal according to Macrovision

standard including AGC and colorstripe pulses.

A 2-wire serial host interface is used to simplify system integration. All the

functions can be controlLED through this interface.

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