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The TW2866 is Techwell's second-generation 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 TW2866 adopts image enhancement techniques such as IF compensation filter, CTI and programmable peaking. In addition, TW2866 includes one NTSC/PAL video encoder with two 10-bit DACs to support CVBS and YC output. The TW2866 also includes an audio codec which has five audio ADCs and one DAC. A built-in audio controller can generate digital outputs for recording/mixing and accepts digital input for playback.


  • 2x/4x analog clock PLL for 108MHz clock output
  • Supports a two-wire serial host interface
  • 1.2V, 3.3V Supply
  • Low power consumption Video Decoder
  • 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. Video Encoder
  • NTSC/PAL Video Encoder
  • CVBS and S-video Support Audio Codec
  • 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


  • Security Surveillance
  • Embedded DVR
  • Video Server
  • DVR PCI Card

Product Options

Orderable Part ID Part Status Pkg. Type Carrier Type MOQ Buy Sample
Obsolete LQFP Tray 90

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
TW2866 Data Short Short Form Datasheet PDF 121 KB