Sunnyvale, Calif.--June 19, 1997--Philips Semiconductors Inc. (Sunnyvale, Calif.) announced the SAA5284--a unique video data acquisition chip that greatly simplifies the recovery of vertical blanking interval (VBI) data from standard broadcast TV signals.
VBI data from a TV signal can be used to deliver a range of content through multimedia PCs and set-top boxes, and the SAA5284 is also compatible with Intel's Intercast technology that will enable transmission of World Wide Web pages alongside TV programming, allowing viewers to instantly access related information via an Internet connection. In addition to recovering VBI data, the SAA5284 also captures the full-field (FF) data transmitted on subscription-based TV channels.
The SAA5284 has an input multiplexer for two analog composite-video baseband signal (CVBS) sources. The selected input is digitized on-chip so that all signal filtering, clock recovery and data slicing can be performed entirely in the digital domain.
Full programmability makes the SAA5284 a true multistandard device, capable of decoding all known VBI formats including 525- and 625-line Teletext, Intercast, wide-screen signalling, video programming system (VPS), closed captioning, and PDC data broadcast standards. For accurate data recovery, the entire demodulation process has been optimized to eliminate the common types of distortion found in broadcast TV signals.
Packet filtering normally performed in software is performed on-chip in the SAA5284. This reduces host processor overhead and allows this unique data acquisition chip to be used with low-cost microcontrollers as well as with high-performance CPUs. Packet data is buffered in on-chip RAM and output via an 8-bit parallel port that is compatible with both Intel and Motorola style processors. This port also has a "video" mode which allows the host to access packet data over the same bus that carries YUV digital video data, making the SAA5284 an ideal companion IC for Philips Semiconductors' desk-top video chip sets.
To produce a complete ISA-bus video data acquisition card, the SAA5284 requires little more than the addition of an address decoding chip. Used in conjunction with Philips Semiconductors' SAA7146 PCI-bus bridge IC, it provides a two-chip solution fo PCI-bus video data acquisition cards. In set-top box applications the SAA5284 can be controlled optionally via the I(2)C-bus.
The SAA5284 is a 5-V device packaged in a 44-lead quad flat pack that is optimized for good EMC performance.
(800) 447-1500 ext. 1392
Return to Headlines