08 November 2012

Clock generator ics promise EMI reduction

A new series of active spread spectrum clock generator ics has been unveiled by ON Semiconductor.

The devices are designed to manage electromagnetic interference (EMI) and radio frequency interference (RFI) at the clock source, delivering system wide EMI reduction of all clock dependent signals.

The P3P8203A LVCMOS peak EMI reduction clock generator targets applications such as graphics cards, computing and consumer applications. This device supports an input voltage of 3.3V, a frequency range of 18 to 36MHz, and analogue control of spread spectrum deviation by means of an external resistor.

By choosing a different value of the external resistor to provide the desired amount of spread spectrum deviation at the output, system designers can customise their applications to achieve the desired EMI reduction. The P3P8203A is housed in an 8pin, 2 x 2 x 0.8mm WDFN package. Operating temperature range is rated at 0 to 70°C.

The P3MS650100H and P3MS650103H LVCMOS peak EMI reduction clock generators are designed for use in pcb space constrained applications such as portable, battery powered devices. Housed in a miniature 4pin WDFN package measuring 1 x 1.2 x 0.8mm, they are said to provide the industry's smallest standalone active solution for reducing EMI/RFI at the clock source as well as downstream clock and data signals derived from the clock source.

Both modules support input voltages ranging from 1.8 to 3.3V, typical spread spectrum deviations of 0.45 to 1.4% and reduction of EMI/RFI in clock sources with a frequency range of 15 to 60MHz. Operating temperature range is -20 to 85ºC.

Author
Laura Hopperton

Supporting Information

Websites
http://www.onsemi.com

Companies
ON Semiconductor

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