New High-Performance Deflection Controllers From Philips Semiconductors Reduce Component Count and Simplify Circuit Alignment.SUNNYVALE, Calif.--(BUSINESS WIRE)--Feb. 10, 1997--Philips Semiconductors today announced two new CRT (1) (C RunTime) See runtime library. (2) (Cathode Ray Tube) A vacuum tube used as a display screen in a computer monitor or TV. The viewing end of the tube is coated with phosphors, which emit light when struck by electrons. deflection controllers, significantly reducing the component count and number of alignments required in autosync monitors while maintaining excellent picture quality. Both ICs are suitable for use in autosync monitors operating at line scan frequencies range between 30 to 90 kHz. They also accommodate Japanese 24-kHz modes. The TDA TDA Texas Department of Agriculture TDA Trade and Development Agency TDA Transportation Development Act TDA Tax Deferred Annuity (commonly known as TSA) TDA Tienda (Spanish: store) 4858, targeted for 14-and 15-inch monitors, and the TDA4855, targeted for 17-inch monitors, feature full autosync capabilities for line-scan frequencies up to 100 kHz, DC controlled adjustment of picture positioning and geometry, and closed-loop control of feedback or feed-forward B+ converters. Both ICs also feature automatic start-up and switch-off sequences to ensure the safe operation of CRT drive components, plus a shut-down mode for X-ray protection. "The high level of functional integration in the TDA4855 and TDA4858 not only simplifies the design process and lowers assembly costs for CRT manufacturers," said Alois Kliner, product marketing manager for these ICs. "Their built-in soft-start, power-down and fault protection modes also improve equipment reliability," he added. The TDA4855 and TDA4858 accept separate horizontal and vertical TTL-level sync inputs, a single composite sync input or a composite video A video color format that combines all three YUV video signals into one channel. The first video signal to include color, composite video transmits brightness/luma (Y) and colors/chroma (U and V) over one cable. NTSC, PAL and SECAM television sets have composite video inputs. input. Initial locking of their on-chip line oscillator oscillator Mechanical or electronic device that produces a back-and-forth periodic motion. A pendulum is a simple mechanical oscillator that swings with a constant amplitude, requiring the addition of energy at each swing only to compensate for the energy lost because of air to these inputs is performed by a frequency detector, after which a PLL PLL - phase-locked loop takes over to provide accurate frequency control. This two-stage locking process, coupled with automatic picture blanking during the frequency searching, allows rapid switching from one screen mode to another without visible picture bounce. DC controlled picture geometry adjustments provided in the TDA4855 and TDA4858 include vertical and horizontal picture size and positioning, S-correction, EW-parabola and trapezium trapezium /tra·pe·zi·um/ (-um) [L.] 1. an irregular, four-sided figure. 2. the most lateral bone of the distal row of carpal bones. tra·pe·zi·um n. pl. correction. For consistent picture geometry, their S-correction and EW-parabola outputs are re-adjusted automatically whenever vertical picture height and positioning are changed, and their EW-parabola amplitude can be set to a constant level or made proportional to the line frequency. The TDA4858 has been specially designed to produce a very smooth top to its EW-parabola waveform in order to eliminate ringing in the CRT's horizontal drive circuits. Both deflection controllers output low-level control signals that can be used to add DC adjustment of parameters such as EW corner and pin balance and vertical focus, tilt and linearity. All of the geometry adjustments required in high-performance monitors are therefore implemented in a single chip plus a few external components. With the addition of Philips Semiconductors' TDA8444 octuple oc·tu·ple adj. 1. Consisting of eight parts or members. 2. Eight times as much in size, strength, number, or amount. n. An eightfold amount or number. tr. & intr.v. 6-bit DAC See D/A converter and discretionary access control. DAC - Digital to Analog Converter all these adjustments can be brought under I2C-bus control. Comprehensive facilities have been provided in the TDA4855 and TDA4858 to protect the picture tube and its deflection drive components. Controlled rise-time of the supply voltage into the devices' 9.2 V to 16 V operating Vcc range progressively activates the internal circuits to guarantee that the screen remains fully blanked until the autosync function, the horizontal/vertical drive outputs and the B+ drive outputs are operational. Similar sequencing during power-down ensures that the screen is blanked before the drive outputs deactivate de·ac·ti·vate tr.v. de·ac·ti·vat·ed, de·ac·ti·vat·ing, de·ac·ti·vates 1. To render inactive or ineffective. 2. To inhibit, block, or disrupt the action of (an enzyme or other biological agent). 3. , while activation of the X-ray protection input results in all drive signals being shut-down immediately. The TDA4855 and TDA4858 are both housed in 32-pin shrink-DIP packages. The price for the TDA4855 is US $3.12 per unit and the price for the TDA4858 is US $2.28 per unit in quantities of 100,000 or more. For pricing and availability outside the United States United States, officially United States of America, republic (2005 est. pop. 295,734,000), 3,539,227 sq mi (9,166,598 sq km), North America. The United States is the world's third largest country in population and the fourth largest country in area. , contact your local Philips Semiconductor Sales Office or Authorized Philips Distributor. Data Sheet is available from Philips Fax-On- Demand by calling 1-800-282-2000, document No. 2239 (for TDA4855) and document No. 2240 (for TDA4858). Philips Semiconductors, Inc., a subsidiary of Philips Electronics North America North America, third largest continent (1990 est. pop. 365,000,000), c.9,400,000 sq mi (24,346,000 sq km), the northern of the two continents of the Western Hemisphere. Corporation and an affiliate of Philips Electronics NV Philips Electronics NV in full Royal Philips Electronics NV Dutch Koninklijke Philips Electronics NV Major Dutch manufacturer of consumer electronics, household appliances, lightbulbs, and imaging equipment. , headquartered in Eindhoven, The Netherlands, is the eleventh largest semiconductor supplier in the world. Philips Semiconductors' innovations in digital audio, video, and mobile technology position that company as a leader in the consumer, multimedia, and wireless communications market. Sales offices are located in all major markets around the world and are supported by regional customer applications labs. Additional information on Philips Semiconductors can be obtained by accessing their home page at http://www.semiconductors.philips.com -0- Note to Editors: Sales information may be obtained by calling 800-447-1500 X 1349. Please do NOT use the editor-contact or corporate telephone numbers for sales information. CONTACT: Philips Semiconductors Jodi Guilbault, 498/991-2332 jguilba@scs.philips.com or Oak Ridge Public Relations public relations, activities and policies used to create public interest in a person, idea, product, institution, or business establishment. By its nature, public relations is devoted to serving particular interests by presenting them to the public in the most Pragati Grover, 408/253-5042 pragati@oakridge.com |
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