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Under what conditions is it OK to use the on-board PLL multiplier?

I'd like to use the REFCLK multiplier, but I want to know if there are any tradeoffs.

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  • Based on this and LoujieC's recent FAQ, does this mean it is potentially better to drive my DDS (AD9910) with an external PLL synth clock than using the internal PLL ? For example, I am currently using an external 10 MHz xtal oscillator with the internal PLL to generate a 1 GHz sysclock. If I generate the 1 GHz externally using a better PLL and then drive the DDS directly, can we expect better performance from the output of the DDS in terms of phase noise and spurious levels etc ?

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  • Based on this and LoujieC's recent FAQ, does this mean it is potentially better to drive my DDS (AD9910) with an external PLL synth clock than using the internal PLL ? For example, I am currently using an external 10 MHz xtal oscillator with the internal PLL to generate a 1 GHz sysclock. If I generate the 1 GHz externally using a better PLL and then drive the DDS directly, can we expect better performance from the output of the DDS in terms of phase noise and spurious levels etc ?

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