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AD9956: Doubt with CML driver and PLLOSC

Question asked by rodney on Feb 27, 2012
Latest reply on Feb 28, 2012 by DSB

Hi,

 

On the typical application of AD9956 datasheet "LO and Baseband Modulation Generation"

The CML driver is connected directly to PLLOSC input, however i think it can't be done. CML driver is current output, and PLLOSC is voltage input. You should use a circuit for convert from CML to PECL or something like that. On AD9956 EVALUATION BOARD there is this circuit. However, the voltage output will be higher than maximun rating specified for PLLOSC input if I'm ok. I would like to know how can I conect CML driver output to PLLOSC input?

 

Thanks in advance!

 

Rodney

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