Author Topic: 180MHz clock generator (Read 2088 times)

DanioIO · « **on:** March 28, 2014, 04:32:39 pm »

Hi,
I'm looking for 180MHz clock for my DDS project, i didnt find any crystal oscillators at that frequency so how is it generated?

woodchips · « **Reply #1 on:** March 28, 2014, 06:53:20 pm »

Overtones. Use a 20MHz oscillator (or whatever) and a 180MHz filter.

Alexei.Polkhanov · « **Reply #2 on:** March 28, 2014, 08:34:09 pm »

Is your DDS project based on FPGA? like maybe Cyclone III or Spartan? You can configure internal PLL to generate clock signal that you need up to ~300 MHz usually. If not look at DDS IC from Analog Devices AD9851 - that one is probably exactly what you need.

http://www.analog.com/en/rfif-components/direct-digital-synthesis-dds/ad9851/products/product.html

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