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Integer Mode HMC833 with a PD Frequency >100MHz

Question asked by tombomb on Oct 19, 2015
Latest reply on Oct 20, 2015 by dyoung1

Our design uses a HMC833 in integer mode. Our clock reference is 112MHz. We'd like to set the R value to 1 and run the internal PD frequency at 112MHz to reduce some spurious problems we're having. According to the HMC833 datasheet, a PD frequency up to 125 MHz is supported in integer mode. However, when we set the R value to 1, we cannot get the PLL to lock. Is there some trick to getting this to work?