Crystal Semiconductor Introduces Fully-Integrated MPEG Audio Subsystem.AUSTIN, Texas--(BUSINESS WIRE)--Dec. 4, 1995--Crystal Semiconductor Corporation, a wholly owned subsidiary Wholly Owned Subsidiary A subsidiary whose parent company owns 100% of its common stock. Notes: In other words, the parent company owns the company outright and there are no minority owners. of Cirrus Logic, Inc. (Nasdaq:CRUS), today introduced the CS4921, a complete ISO (1) See ISO speed. (2) (International Organization for Standardization, Geneva, Switzerland, www.iso.ch) An organization that sets international standards, founded in 1946. The U.S. member body is ANSI. MPEG (Moving Pictures Experts Group) An ISO/ITU standard for compressing digital video. Pronounced "em-peg," it is the universal standard for digital terrestrial, cable and satellite TV, DVDs and digital video recorders (DVRs). audio subsystem on a single CMOS (Complementary Metal Oxide Semiconductor) Pronounced "c-moss." The most widely used integrated circuit design. It is found in almost every electronic product from handheld devices to mainframes. integrated circuit. The fully-integrated, low-power device provides CD-quality audio for desktop,notebook, and embedded multimedia computer applications. The CS4921 supports all MPEG sample rates and bit rates, and decompresses mono, dual mono, stereo, and joint stereo digital audio streams. The CS4921 supports MPEG Elementary Streams, MPEG1 Packets, MPEG2 PES pes (pes) pl. pe´des [L.] 1. foot. 2. any footlike part. pes n. pl. pe·des 1. The foot. 2. , and PCM (1) See phase change memory. (2) (Plug Compatible Manufacturer) An organization that makes a computer or electronic device that is compatible with an existing machine. Audio Passthru formats. "All the building blocks for MPEG are in this mixed-signal device," states Craig Ensley, vice president and general manager of Crystal's Computer Products division. "The CS4921 is the only single-chip MPEG audio solution on the market, and it supports video by featuring audio self-synchronization." The CS4921 consists of an MPEG audio processor, and a number of supplementary analog and digital blocks that include a programmable phase-lock loop (PLL) clock multiplier, a serial audio input port, a CD-quality stereo digital-to-analog converter (DAC See D/A converter and discretionary access control. DAC - Digital to Analog Converter ),an AES/EBU-S/PDIF compatible digital audio transmitter, and a serial control port. The device includes a 768-byte first-in, first-out (FIFO (First In First Out) A storage method that retrieves the item stored for the longest time. Contrast with LIFO. See traffic engineering methods. FIFO - first-in first-out ) buffer, and requires no external program memory. Crystal's audio subsystem decompresses the ISO MPEG Layers I and II audio streams with all compliant bit rates and sample rates (including half sample rates). The resulting audio samples are sent to the on-chip 16-bit stereo DAC and optionally to the AES/EBU-S/PDIF digital audio output. The CS4921 maintains a full 24-bit data path for audio decompression to ensure high quality 16 bit audio output. The clock manager is a programmable PLL which is used to generate the oversample clock for the delta-sigma DACs. This architecture allows the CS4921 to support 48kHz, 44.1kHz, 32kHz, 24kHz, 22.05kHz, and 16kHz sample rates by reading the MPEG audio stream information and programming the PLL for the proper operation. This eliminates the requirement for external oscillators for data conversion. PCM sample rates between 48kHz and 7kHz are supported. The CS4921 features a stereo DAC using a delta-sigma architecture for analog reproduction of the digital input. On-chip switched-capacitor filters perform most of the reconstruction process, and only a simple external passive filter is required. In addition to the analog output, the AES/EBU-S/PDIF-compatible output allows very high quality digital data to be transmitted in a standard format to external systems such as high-end consumer stereo's. The CS4921 is available in a 44-pin plastic leaded chip carrier A Plastic Leaded Chip Carrier (PLCC) is a four-sided “J”-leaded plastic integrated circuit package with pin spacings of 0.05" (1.27 mm). Lead counts range from 20 to 84. PLCC packages can be square or rectangular. Body widths range from .35" to 1.15". (PLCC (Plastic Leaded Chip Carrier) A plastic, square, surface mount chip package that contains leads on all four sides. The leads (pins) extend down and back under and into tiny indentations in the housing. See chip package. ) package and sells for $13.10 in quantities of 10,000. Samples are available now with production quantity availability planned for 1Q 1996. The CS4921 is upward- and pin-compatible with Crystal's CS4920 and CS4920A audio subsystems to ease migration of existing designs. Crystal Semiconductor, headquartered in Austin, Texas, designs, manufactures and markets advanced analog and digital integrated circuits for applications in the multimedia, telecommunications, data communications, consumer audio, data conversion and signal acquisition markets. Headquartered in Fremont, Calif., Cirrus Logic is a leading manufacturer of advanced integrated circuits for the desktop and portable computing, telecommunications, and consumer electronics markets. -0- Note to Editors: Product photography available upon request. CONTACT: Crystal Semiconductor Corp. Tom Agler, 512/912-3701 Daryl Sartain, 512/912-3572 |
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