Introduction

The TW2868 includes eight high quality

NTSC/PAL/SECAM video decoders that convert

analog composite video signal to digital

component YCbCr data for security application.

Each channel contains 10 bit ADC and proprietary

clamp and gain controllers and utilizes 4H comb

filter for separating luminance & chrominance to

reduce cross noise artifacts. The TW2868 adopts

the image enhancement techniques, such as IF

compensation filter, CTI and programmable

peaking. TW2868 also includes one NTSC/PAL

video encoder with two 10 bit DAC’s to support

CVBS and YC output. The TW2868 also includes

audio CODEC, which has ten audio Analog-toDigital converter processing and one Digital-toAnalog converter. A built-in audio controller can

generate digital outputs for recording/mixing and

accepts digital input for playback.

特性 Features

? Accepts all NTSC(M/4.43) /

PAL(B/D/G/H/I/K/L/M/N/60)/SECAM

standards with auto detection

? Integrated eight video analog anti-aliasing

filters and 10 bit CMOS ADCs

? High performance adaptive 4H comb filters for

all NTSC/PAL standards

? IF compensation filter for improvement of color

demodulation

? Color Transient Improvement (CTI)

? Automatic white peak control

? Programmable hue, saturation, contrast,

brightness and sharpness

? Proprietary fast video locking system

? Supports ITU-R BT.656 type time multiplexed

output with 54/108MHz

? Provides simultaneous 2x four channel Full D1

with 108MHz and 2x CIF with 54MHz by timemultiplexed output format

? Integrated ten audio ADC processing and one

audio DAC

? Provides multi-channel audio mixed analog

output

? Supports I2S/DSP Master/Slave interface for

record output and playback input

? PCM 8/16 bit and u-Law/A-Law 8bit for audio

word length

? Programmable audio sample rate that covers

popular frequencies of 8/16/32/44.1/48kHz

? Supports a two-wire serial host interface

? Integrated one video encoder and two10bit

video CMOS DACs.

? Integrated clock PLL for 108MHz clock output.

? Ultra low power consumption (Typical

867.36mW)

? 128 pin LQFP package