Techwell
Mixed Signal Semiconductor Solutions
TECHWELL
SECURITY
Security Surveillance IC Solutions
PRELIMINARY
Features
Target Applications
Standalone DVR
PC Based DVR
TW2815
4 Channel Video Decoders and Audio Codecs
For Security Applications
* Pin to pin compatible with the TW2816
Features
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-aliasing
filters and 10 bit CMOS ADCs
High performance adaptive 4H comb filters for
all NTSC/PAL standards
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
Supports the standard ITU-R BT.656 format or
time multiplexed output with 54MHz
Provides simultaneous four channel Full D1
and CIF time-multiplexed outputs with 54MHz
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
*
8/16 bit audio word length
Sample audio with 8/16KHz
Supports a two-wire serial host interface
Ultra low power consumption (Typical
500mW)
100 TQFP package
* TW2815 only
The TW2815 includes four high quality NTSC/PAL video decoders that
convert analog composite video signal to digital component YCbCr data
for security applications. The TW2815 contains four 10 bit ADC and
proprietary clamp and gain controllers and utilizes a 4H comb filter for
separating luminance & chrominance to reduce cross noise artifacts. The
TW2815 adopts the image enhancement techniques such as IF
compensation filter, CTI and programmable peaking. The TW2815 also
includes an audio CODEC which has four audio Analog-to-Digital
converters and one Digital-to-Analog converter. A built-in audio controller
can generate digital outputs for recording/mixing and accepts digital
input for playback.
Block Diagram
Audio
Audio
Audio
Audio
Video
Video
Video
Security
Cameras
Video
IS
Display
Video
Controller
CODEC/
DSP
Internet
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TW2815
656
656
656
656
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Techwell
Mixed Signal Semiconductor Solutions
www.techwellinc.com
Security Surveillance IC Solutions
PRELIMINARY
TW2815 Block Diagram
4H Comb
Video Decoder
TW2815
4 Channel Video Decoders and Audio Codecs
For Security Applications
* Pin to pin compatible with the TW2816
BT .656
Interface
VIN1
ADC
VD1[7:0]
VD2[7:0]
VD3[7:0]
VD4[7:0]
MPP1
MPP2
MPP3
MPP4
AIN1
ADC
Decimation Filter
MPP
Interface
Clock
Generator
VIN2
ADC
4H Comb
Video Decoder
AIN2
ADC
Decimation Filter
CLKPO
CLK541
CLKNO
VIN3
ADC
Host
Interface
4H Comb
Video Decoder
SCLK
SDAT
IRQ
AIN3
ADC
Decimation Filter
VIN4
ADC
4H Comb
Video Decoder
I2S
Interface
ACLKR
ASYNR
ADATR
ADATM
ACLKP
ASYNP
ADATP
AIN4
ADC
Decimation Filter
AOUT
DAC
Interpolation Filter
About Techwell
Techwell is a fabless semiconductor company that designs, markets and sells mixed signal integrated circuits for multiple digital video
applications in the consumer, security surveillance and automotive markets, including advanced TVs, multifunction LCD monitors,DVD
Recorders, security surveillance systems and in-car LCD displays. Founded in 1997,we currently have over 70 employees and are
headquartered in San Jose,California, with additional R&D and sales activities in South Korea, Japan,Taiwan and China.
Techwell
For more information on Techwell, please contact us at 1-408-435-3888
© 2006 Techwell Inc. All rights reserved.
All other trademarks are property of their respective owners
Mixed Signal Semiconductor Solutions
TECHWELL INC.
TEL 1-408-435-3888 www.techwellinc.com
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