W9950P
TV ENCODER
GENERAL DESCRIPTION
The W9950P digital video encoder converts digital
R,G,B 24-bit data and YCrCb (4:2:2) 16-bit data into
analog composite video and Y/C video signals. The
video format is 525-line (M) NTSC or 625-line
(B,D,G, H,I) PAL.
The W9950P can operate in master or slave mode.
In master mode, the W9950P internally generates
the required video timing signals HSYNC and
VSYNC and a FIELD signal according to the
specified NTSC/PAL video standard. In slave mode,
it accepts HSYNC and VSYNC input signals to
synchronize with an external video source.
The input data are converted into luminance and
chrominance components. Gamma correction can
be selected by the Gamma pin in RGB 24-bit mode.
The chroma data are then low passed by a 1.3 MHz
filter and modulated by a color subcarrier.
The Y signal consists of luminance, sync, and blank
signals. It is converted by an 8-bit D/A converter into
an analog Y signal. The C signal consists of color
burst and modulated color information. It is
converted by an 8 bit D/A converter into an analog C
signal. The analog Y and C signal outputs are
available for interfacing to S-video input machines.
There are two analog composite outputs. This allows
one output to provide baseband composite video
and the other output to drive an RF modulator
simultaneously.
The W9950P may be placed in power-down mode by
selecting the SLEEP pin.
The W9950P is designed for digital video
applications such as video CD,and Video games.
Since no internal registers require CPU
programming, the PC board wire routing is very
simple.
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Power-down mode
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Optional Gamma correction
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CCIR601 or square pixel input data rates
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Master/slave sync signal switchable
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Interlaced and non-interlaced operation
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Optional internal voltage reference
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Internal digital oscillator (no crystal required)
Sync
GAMMA
Correction
&
Color Space
Converter
Video
Timming
Generator
DAC
DAC
DAC
Y
Composite
Composite
C
RGB
/YCbCr
Low
Pass
Filter
Modulator
DAC
CLK
BandgapVoltage
Reference
V/ H SYNC
Fig 1. W9950P Functional Block
CLK
Slave
RGB, YCbCr
Blank
Master
CVBS
W9950P
MPEG
Decoder
Field
V.Sync
H.Sync
TV
Encoder
S-video
FEATURES
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Monolithic CMOS process
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Two composite outputs
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Y/C video output (S video)
Fig 2. W9950P Application
Winbond Corporate Headquarters
Tel : 886-3-5790666
Fax : 886-3-5796139
Taipei Sales Office
Tel : 886-2-27190505
Fax : 886-2-27197502
Winbond Electronics North America Corp.
Tel : 1-408-943666
Fax : 1-408-9436668
Winbond Electronics H.K. Ltd.
Tel : 852-27513100
Fax : 852-27552064
Apr. 1997
Details are subject to change without notice. All trademarks are property of their respective holders.
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