SAA7118 Multistandard Video Decoder With Adaptive Comb Filter And Component Video Input

The SAA7118 is a Video capture device for applications at the image port of Video Graphics Array (VGA) controllers. Philips X-VIP is a new multistandard comb Filter Video Decoder chip with additional component processing, providing high quality, optionally scaled and Video The SAA7118 is a combination of a four-channel Analog preprocessing circuit including source selection, anti-aliasing Filter and Analog-to-digital Converter (ADC) with succeeding decimation Filters from 27 MHz to 13.5 MHz data rate. Each preprocessing channel comes with an Automatic clamp and gain control. The SAA7118 combines 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 SAA7118 accepts CVBS or S-video (Y/C) as Analog inputs from TV or VCR sources, including weak and distorted signals as well as baseband component signals Y-PB-PR or RGB. 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 SAA7118 supports 8-bit or 16-bit wide output data with auxiliary reference data for interfacing to VGA controllers. The target application for the SAA7118 is to capture and scale Video images, to be provided as a digital Video stream through the image port of a VGA controller, for capture to system memory, or just to provide digital baseband Video to any picture improvement processing. The SAA7118 also provides a means for capturing the serially coded data in the Vertical Blanking Interval (VBI) data. Two principal functions are available: To capture raw Video samples, after interpolation to the required output data rate, via the scaler A versatile data slicer (data recovery) unit The SAA7118 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. All of the ADCs may be used to digitize a VSB signal for subsequent decoding; a dedicated output port and a selectable VSB Clock input is provided. The circuit is I2C-bus controlled (full write/read capability for all programming Registers bit rate up to 400 kbit/s).
By NXP Semiconductors
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