HMC7044 - CLKIN

Question

Dear all, 
 
 I would like your kindly support to help me about the input clock HW configuration of HMC7044. If all references appear valid, PLL1 uses a reference priority table to select the best candidate. 
 a) Could I use only one external input reference on CLKIN0 (PIN39 and Pin 40)? 
 b) Should to add a phisical pull-down to the pins of CLKIN3, CLKIN2 and CLKIN1? 
 
 Thanks in advanced, 
 AM

ADIApproved · Accepted Answer

Hi AM, 
 Yes, you can connect only one reference input. You don't need to do anything about unused reference inputs. You can disable them with SPI programming. 
 Kudret

AMorra712 · Answer

Hi Kudret, 
 thank you for your prompt reply and for your kind cooperation. 
 AM

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HMC7044 - CLKIN

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