HMC625BLP5E Pinout Connections

Question

Hi, 
 
 In reading the datasheet for the HMC625, there is a bit of vague information. If I plan on using the SPI interface only to control the gain, is it possible to leave D0-D6 unconnected? Are there internal pullups or pulldowns on any of these signals? 
 
 Also can I leave PUP1 and PUP2 unconnected? 
 
 Thank you, 
 
 Will

ADIApproved · Accepted Answer

Hi Will, 
 On the first question, it's best to terminate all unused logic pins to gnd with a 10K ohm resister. 
 For the SPI bus, as shown on pg 5 of the datasheet, in the "Control Voltage Table", you can use any logic above 2 volts, whether Vdd = 3 or 5 volts. 
 Thanks, 
 Darrell

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HMC625BLP5E Pinout Connections

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