SAN JOSE, Calif., Intel Developer’s Forum – August 22, 2000 – Cirrus Logic Inc. (NASDAQ:CRUS), the worldwide market share leader in audio ICs, today announced the Crystal® CS4201 audio CODEC, a new device that incorporates a number of cost and space-saving features such as a microphone pre-amp, Phase Locked Loop (PLL), headphone amp, and S/PDIF transmitter plus the features of a standard AC 97 CODEC all in one chip. The CS4201 is designed to provide on-board audio for motherboard manufacturers, as well as support for manufacturers of boards that follow Intel’s Communications and Network Riser (CNR) specifications. The new Crystal solution will be previewed this week at the Intel Developer Forum Fall 2000.

“This solution underlines our commitment to providing the highest level of support for Intel’s Communications and Network Riser interface specification,” said Keith Essency, vice president and general manager for the Computer Audio Products Division. “When combined with our driver technology and Microsoft’s multi-channel WAV format, the resulting product is built-in high quality sound that is an extremely high value to the consumer.”

The CS4201 eliminates the need for multiple devices that are traditionally part of the audio subsystem’s bill of materials (BOM), reducing costs for PC manufacturers. The high-performance microphone pre-amp eliminates the need for an external microphone pre-amp and offers the additional functionality of programmable gain. This low noise internal pre-amp is programmable in 10dB steps from 0-30 dB. The integrated high-performance headphone amplifier is capable of driving 32-ohm headphone loads directly and delivering up to 60mW, eliminating the need for an external headphone amplifier.

The CS4201’s analog phase locked loop (PLL) is designed to eliminate the quartz crystal from a typical design. The PLL will accept direct clocking at 14.318, 27 or 48 MHz. This analog PLL method preserves the correct operating frequency of the AC-Link so that secondary CODECs, such as those used for soft modem applications, will function correctly.

In addition, the CS4201 incorporates a built-in Sony/Philips Digital Interface (S/PDIF) to enable interconnection to high quality audio/video equipment, a high-quality, pseudo-differential CD input, and CrystalClearTM 3D Stereo Enhancement to expand the apparent sound stage of two speaker installations.

Intel’s Communications Network Riser specification allows for extremely flexible system integration. OEMs can add all manner of communications and multimedia features by simply adding appropriate “riser” cards. In a CNR environment the CS4201 has a feature that makes it truly outstanding. It includes two I2S outputs, which allow for the addition of up to two low cost stereo DACs for 4 or 6-channel audio. Competitive solutions require the use of multiple CODECs to gain the additional channels. A six-channel solution using the CS4201 CODEC and two of Crystal’s 20-bit CS4334 DACs presents considerable savings in both BOM and board space compared to alternatives requiring up to three CODECs.

Pricing and Availability

The Crystal CS4201 chip is available today and is priced at $2.10 in OEM quantities.

Cirrus Logic

Cirrus Logic is a premier supplier of high-performance analog and DSP chip solutions for Internet entertainment electronics. Building on its global market share leadership in audio integrated circuits and its rich mixed-signal patent portfolio, the company targets high-volume audio, storage and communications applications. Cirrus Logic sells its products under the Crystal®, Maverick™ and 3Ci™ brands as well as its own name. Founded in 1984 in Silicon Valley, Cirrus Logic operates from headquarters in Austin, Texas and major sites located in Fremont, California and Broomfield, Colorado as well as offices in Europe, Japan and Asia. More information about Cirrus Logic is available at www.cirrus.com.

Safe Harbor Provision

Any forward looking statements and all other statements that may be made in this news release that are not historical facts are subject to a number of risks and uncertainties, and actual results may differ materially. Please refer to Cirrus Logic’s current Form 10-K and other filings with the Securities and Exchange Commission for more information on the risk factors that could cause actual results to differ.

Note to editors: Cirrus Logic, Crystal® and Maverick™ are registered trademarks of Cirrus Logic Inc. All other product names noted herein may be trademarks of their respective holders.

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