Techwell TW2864 4-Channel Video Decoder and Audio Codec For Security Applications Target Applications Embedded DVR Video Server DVR PCI Card Features Improved adaptive 4H comb filters for all NTSC/PAL standards Supports ITU-R BT.656 format or time multiplexed output with 54MHz or 108MHz Provides simultaneous 4-channel Full D1 or CIF time-multiplexed outputs PCM 8/16-bit and u-Law/A-Law 8-bit for audio word length Programmable audio sample rates: 8, 16, 32, 44.1 and 48kHz The TW2864 is Techwell’s 4th generation 4-in-1 video decoder and audio codec for security surveillance applications. The device includes four high quality NTSC/PAL video decoders that convert analog composite video signal to digital component YCbCr data. The TW2864 contains four 10-bit ADCs and proprietary clamp and gain controllers and utilizes adaptive 4H comb filter for separating luminance & chrominance to reduce cross noise artifacts. The TW2864 adopts the image enhancement techniques such as IF compensation filter, CTI and programmable peaking. The TW2864 also includes audio codec which has four audio ADCs and one audio DAC. A built-in audio controller can generate digital outputs for recording/mixing and accepts digital input for playback. Typical Application Diagram 4-Channel D1 Time Division Multiplexed Video Decoder ch1 ch2 ch3 ch4 ch1 ch2 ch3 ch4 Cb0 FF Cr6 Y11 Y0 00 Y6 Cr12 Baseband Audio Out Accepts all NTSC(M/N/4.43) / PAL(B/D/G/H/I/K/L/M/N/60) standards with auto detection Integrated four video analog anti-alias filters and 10 bit CMOS ADCs 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 for non-realtime application Field lock mode Video In Video In Video In Video In Audio In ch1 Amp BT.656 ch2 ch3 MUX/ CODEC ch4 TW2864 Audio In Audio In I2S Audio In I2S 108MHz Digital Video Output Mode Audio Codec Other Features Integrated four audio ADCs and one audio DAC Provides multi-channel audio mixed analog output Supports a standard I2S interface for record output and playback input Techwell Speaker Audio and video sync function Supports a two-wire serial host interface Ultra low power consumption (Typical 500mW) 100 pin TQFP package www.intersil.com TW2864 4-Channel Video Decoder and Audio Codec For Security Applications TW2864 Block Diagram © 2007 Intersil Americas Inc. All Rights Reserved. The following are trademarks or registered trademarks of Intersil Americas Inc.: Intersil, Intersil logo, “i” and Design. All other trademarks are the property of the respective trademark owners. Techwell www.intersil.com