saa7114 NXP Semiconductors, saa7114 Datasheet
saa7114
Manufacturer Part Number
saa7114
Description
Pal/ntsc/secam Video Decoder With Adaptive Pal/ntsc Combfilter, Vbi-data Slicer And High Performance Scaler
Manufacturer
NXP Semiconductors
Datasheet
1.SAA7114.pdf
(144 pages)
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1. General description
The SAA7114 is a video capture device for applications at the image port of Video
Graphics Array (VGA) controllers.
The SAA7114 is a combination of a two-channel analog preprocessing circuit including
source selection, anti-aliasing filter and Analog-to-Digital Converter (ADC), an automatic
clamp and gain control, a Clock Generation Circuit (CGC), a digital multistandard decoder
containing two-dimensional chrominance/luminance separation by an adaptive comb filter
and a high performance scaler, including variable horizontal and vertical up and
downscaling and a brightness, contrast and saturation control circuit.
It is a highly integrated circuit for desktop video and similar applications. The decoder is
based on the principle of line-locked clock decoding and is able to decode the color of
PAL, SECAM and NTSC signals into ITU 601 compatible color component values. The
SAA7114 accepts CVBS or S-video (Y/C) as analog inputs from TV or VCR sources,
including weak and distorted signals. An expansion port (X port) for digital video
(bidirectional half duplex, D1 compatible) is also supported to connect to MPEG or a video
phone codec. At the so called image port (I port) the SAA7114 supports 8-bit or 16-bit
wide output data with auxiliary reference data for interfacing to VGA controllers.
The target application for the SAA7114 is to capture and scale video images, to be
provided as a digital video stream through the image port of a VGA controller, for display
via the frame buffer of the VGA, or for capture to system memory.
In parallel the SAA7114 also incorporates provisions for capturing the serially coded data
in the Vertical Blanking Interval (VBI) data. Two principal functions are available:
The SAA7114 also incorporates field-locked audio clock generation. This function ensures
that there is always the same number of audio samples associated with a field, or a set of
fields. This prevents the loss of synchronization between video and audio during capture
or playback.
The circuit is I
rate up to 400 kbit/s).
1. To capture raw video samples, after interpolation to the required output data rate, via
2. A versatile data slicer (data recovery) unit
SAA7114
PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC
comb filter, VBI data slicer and high performance scaler
Rev. 03 — 17 January 2006
the scaler
2
C-bus controlled (full write/read capability for all programming registers, bit
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