Techwell
Target Applications
Embedded DVR
Video Server
DVR PCI Card
TW2865
5
4-Channel Video Decoder and Audio Codec plus
Video Encoder for Security Applications
The TW2865 is a 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 TW2865 adopts image enhancement techniques such as IF compensation filter, CTI and programmable peaking. In addition,
TW2865 includes one NTSC/PAL video encoder with two 10-bit DACs to support CVBS and YC output. The TW2865 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.
New Features
Integrated one video encoder and two 10-bit video CMOS DACs
Proprietary fast video locking system for non-realtime application
Integrated five audio ADCs and one audio DAC
Low power consumption
Typical Application Diagram
C C T V Monitor
S -V ideo / C V B S
B T .656
V ideo In
(C h1 - 4)
27M H z
B T .656
HOST
P rocessor
MUX/
CODEC
Audio In
(C h1 - 4)
T W 2865
27/54/108M H z
I2S
ID E
USB
N etw ork
Mic rophone
S peaker
I2S
ll
hwe
5
Tec
286
TW
Techwell
TW2865
5
Video Decoders
4-Channel Video Decoder and Audio Codec plus
Video Encoder for Security Applications
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
TW2865 Block Diagram
MUX
Audio Codecs
B T .656
Inte rfac e
V IN 1 A
V IN 1 B
A IN 1
AA D C
DC
4H C om b
V ideo D ec oder
D ec im ation F ilter
AA D C
DC
V D 1[7:0]
V D 2[7:0]
V D 3[7:0]
V D 4[7:0]
MPP 1
MPP 2
MPP 3
MPP 4
C LK P O n
XTO
XTI
C LK N O n
S C LK
SDAT
IR Q
A C LK R
ASYNR
AD ATR
AD ATM
A C LK P
ASYNP
AD ATP
MUX
V IN 2 A
V IN 2 B
A IN 2
AA D C
DC
4H C om b
V ideo D ec oder
D ec im ation F ilter
M UX
V IN 3 A
V IN 3 B
A IN 3
AA D C
DC
4H C om b
V ideo D ec oder
D ec im ation F ilter
C loc k P L L
C lo ck
G e ne ra to r
AA D C
DC
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
MPP
In te rfac e
AA D C
DC
H os t
In te rfa ce
Order Information
Part Number: TW2865
Package: 128 pin LQFP
M UX
V IN 4 A
V IN 4 B
A IN 4
AA D C
DC
4H C om b
V ideo D ec oder
I2S
Inter fac e
AA D C
DC
D ec im ation F ilter
Video Encoder
NTSC/PAL Video Encoder
CVBS and S-video Support
A IN5
ADC
D ec im ation F ilter
AOU T
DAC
Interpolation F ilter
Other Features
VYOU T
DAC
D igital V ideo
E nc oder
VC OU T
DAC
E N C LK
E D[7:0]
2x/4x analog clock PLL for 108MHz clock
output
Supports a two-wire serial host interface
1.8V Supply
Low power consumption
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 160 employees and are headquartered in
San Jose, California, with additional R&D and sales activities in South Korea, Japan, Taiwan and China. NASDAQ: TWLL
2009 Techwell Inc. All rights reserved.
Techwell
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