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Amplifiers/Converters??

Four-PLL spread-spectrum timing chip cuts EMI

Posted: 09 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:spread-spectrum timing solution? timing device? EMI reduction?

Cypress Semiconductor Corp. has introduced the latest member of its PREMIS (Peak Reducing EMI Solutions) family of spread-spectrum timing solutions. The new CY25400 is a four-PLL timing device with two spread-spectrum PLLs to reduce EMI. The new device saves cost by eliminating shielding, ferrite beads and chokes often used to address EMI issues.

The flexible device also offers two-wire I?C programming that allows manufacturers to adjust EMI reduction variables for real-time determination of optimum system configuration. The CY25400 meets critical timing performance, voltage and power requirements for digital entertainment systems, handheld applications and CE systems, including multifunction printers, scanners, HDTV, STB, DVD-R, HDDs, handsets and portable games.

"The CY25400 is a strong addition to our PREMIS family, offering a flexible, programmable timing solution that gives customers both EMI protection and timing performance," said Wayne Gill, Cypress's Timing Technology business unit manager. "It delivers a wide array of operating voltage, power consumption and jitter performance, all housed in a package. We believe we have provided systems engineers with the ultimate EMI weapon."

The new device can be programmed via memory and/or a serial I?C interface. A range of parameters can be programmed, including output frequencies, spread profile (Linear or Lexmark), spread percentages, output drive strength and crystal load capacitance. The spread-spectrum feature can be turned on or off and tweaked during the design. In addition, the Lexmark profile provides maximum EMI reduction. The CY25400 offers three frequency-select pins to allow users to specify up to nine frequency outputs in the range of 3-166MHz, based on application need. This allows customers to use the same device on every platform, easing ordering and record keeping, and reducing risk of excess or bad inventory. The device offers four different outputs voltage options -3.3-, 3-, 2.5- and 1.8V. In addition, the four PLLs are optimized for low power.

The CY25400 is available in 24-pin QFN package (4-by-4 mm), 16-pin QFN package (3-by-3 mm) and 8-pin SOIC package. The QFN package not only saves board space but also offers improved jitter performance. Samples of the CY25400 are available with full production expected in May 2007. It is priced between $2.49 and $1.49, depending on quantity.




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