www.intersil.com techwell techwell target applications target applications tw28655 embedded dvr video server dvr pci card 4-channel video decoder and audio codec plus video encoder for security applications the tw2865 is a 4-in-1 video decoder and audio codec plus video encoder for security surveillance applications. the device includes four high quality ntsc/pal/secam video decoders that convert analog composite video signal to digital component ycbcr data. each channel contains a 10-bit adc and proprietary clamp/gain controller and utilizes 4h comb filter for separating luminance & chrominance to reduce cross noise artifacts. the tw2865 adopts image enhancement techniques such as if compensation filter, cti and programmable peaking. in addi tion, tw2865 includes one ntsc/pal video encoder with two 10-bit dacs to support cvbs and yc output. the tw2865 also includes an audi o codec which has five audio adcs and one dac. a built-in audio controller can generate digital outputs for recording/mixing and accept s digital input for playback. new features integrated one video encoder and two 10-bit video cmos dacs proprietary fast video locking system for non-realtime application integrated five audio adcs and one audio dac low power consumption typical application diagram bt.656 i2s speaker 27/54/108mhz tw2865 mux/ codec bt.656 27mhz i2s microphone audio in (ch1 - 4) video in (ch1 - 4) s-video / cvbs cctv monitor host processor ide usb network techwell tw2865
techwell tw28655 4-channel video decoder and audio codec plus video encoder for security applications tw2865 block diagram ? 2009 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. www.intersil.com video decoders accepts all ntsc(m/4.43) / pal(b/d/g/h/i/k/l/m/n/60)/secam standards with auto detection integrated four video analog anti-aliasing filters and 10-bit adcs high performance adaptive 4h comb filters for all ntsc/pal standards if compensation filter for improvement of color demodulation color transient improvement (cti) and automatic white peak control programmable hue, saturation, contrast, brightness and sharpness proprietary fast video locking system for non-realtime application supports the standard itu-r bt.656 format or time multiplexed output with 54/108mhz. provides simultaneous four channel full d1 and cif time-multiplexed outputs with 54mhz audio codecs integrated five audio adcs 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 video encoder ntsc/pal video encoder cvbs and s-video support order information part number: tw2865 package: 128 pin lqfp other features 2x/4x analog clock pll for 108mhz clock output supports a two-wire serial host interface 1.8v supply low power consumption vd3[7:0] i2s interface bt.656 interface mpp interface mpp1 aclkr vd1[7:0] vd2[7:0] vd4[7:0] mpp2 mpp3 mpp4 asynr adatr adatm aout aclkp asynp adatp adc 4h comb video decoder d ecim ation filter adc adc 4h comb video decoder d ecim ation filter adc clock pll clock generator clkpon xti clknon host in te rfa ce sclk sdat irq adc 4h comb video decoder d ecim ation filter adc adc 4h comb video decoder d ecim ation filter adc adc 4h comb video decoder d ecim ation filter adc adc 4h comb video decoder d ecim ation filter adc adc 4h comb video decoder adc adc 4h comb video decoder mux mux mux mux vin1a vin1b vin2a vin2b vin3 a vin3 b vin4a vin4b ain3 ain2 ain1 adc ain4 ain5 adc d ecim ation filter decimation filter dac interpolation filter digital video encoder dac dac vyout vcout enclk ed[7:0] xto
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