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TW2864
4-Channel Video Decoder and Audio Codec For Security Applications
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Product Description
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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.
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Target Applications
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- Embedded DVR
- Video Server
- DVR PCI Card
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Features
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- Improved adaptive 4H comb filters for allNTSC/PAL standards
- Supports ITU-R BT.656 format or time multiplexed output with 54MHz or 108MHz
- Provides simultaneous 4-channel Full D1 or CIFtime-multiplexed outputs
- PCM 8/16-bit and u-Law/A-Law 8-bit for audioword length
- Programmable audio sample rates: 8, 16, 32, 44.1 and 48kHz
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Video Decoder
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- 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
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Other Features
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- Audio and video sync function
- Supports a two-wire serial host interface
- Ultra low power consumption (Typical 500mW)
- 100 pin TQFP package
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Audio Codec
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- 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
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Application Diagram
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Block Diagram
(click on image for larger view)
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