August 9, 2011 1
FN7796.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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8-Channel Video Decoders and Audio Codecs and
Video Encoder for Security Applications
TW2868
Introduction
The TW2868 includes eight high quality
NTSC/PAL/SECAM video decoders that convert
analog composite video signal to digital
component YCbCr data for security application.
Each channel contains 10 bit ADC and proprietary
clamp and gain controllers and utilizes 4H comb
filter for separating luminance & chrominance to
reduce cross noise artifacts. The TW2868 adopts
the image enhancement techniques, such as IF
compensation filter, CTI and programmable
peaking. TW2868 also includes one NTSC/PAL
video encoder with two 10 bit DAC’s to support
CVBS and YC output. The TW2868 also includes
audio CODEC, which has ten audio Analog-to-
Digital converter processing and one Digital-to-
Analog converter. A built-in audio controller can
generate digital outputs for recording/mixing and
accepts digital input for playback.
Features
Accepts all NTSC(M/4.43) /
PAL(B/D/G/H/I/K/L/M/N/60)/SECAM
standards with auto detection
Integrated eight 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
Supports ITU-R BT.656 type time multiplexed
output with 54/108MHz
Provides simultaneous 2x four channel Full D1
with 108MHz and 2x CIF with 54MHz by time-
multiplexed output format
Integrated ten audio ADC processing 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
Supports a two-wire serial host interface
Integrated one video encoder and two10bit
video CMOS DACs.
Integrated clock PLL for 108MHz clock output.
Ultra low power consumption (Typical
867.36mW)
128 pin LQFP package
