Techwell
Security Surveillance IC Solutions
Target Applications
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Embedded DVR
Video Server
DVR PCI Card
4-Channel Video Decoder and Audio Codec
for Security Applications
*Pin to pin compatible with TW2866
TW2867
The TW2867 is Techwell’s advanced 4-in-1 video decoder and audio codec 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 and chrominance to reduce cross noise artifacts. The TW2867 adopts image enhancement
techniques such as IF compensation filter, CTI, and programmable peaking. The TW2867 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.
Techwell
www.techwellinc.com
Security Surveillance IC Solutions
4-Channel Video Decoder and Audio Codec
for Security Applications
*Pin to pin compatible with TW2866
TW2867
Video Decoder
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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 clock
Provides simultaneous four channel Full D1 and CIF time-multiplexed outputs with 54MHz clock
Audio Codec
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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
TW2867 Block Diagram
Other Features
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2x/4x analog clock PLL for 108MHz clock output
Supports a two-wire serial host interface
1.2V, 3.3V Supply
Low power consumption
Order Information
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Part Number: TW2867
Package: 128-pin LQFP
About Techwell
Techwell is a fabless semiconductor company that designs, markets and sells mixed signal integrated circuits in the security surveillance,
automotive infotainment, and consumer markets. Founded in 1997, we currently have over 200 employees and are headquartered in San Jose,
California, with additional R&D and sales activities in South Korea, Japan, Taiwan and China.
Techwell
TECHWELL INC.
TEL 1-408-435-3888 www.techwellinc.com
© 2010 Techwell Inc. All rights reserved. All other trademarks are property of their respective owners.
Specifications subject to change without notice.
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