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HMC624 high current on spi inputs

Question asked by GeorgeK on Aug 28, 2017
Latest reply on Sep 13, 2017 by s.ilke

Hello,  i have 10 hmc624, which is connected to atmega128 through spi. Atmega drives directly 10* data&clk hmc624 inputs from just one pair data and clk outputs of spi. Atmega powered by 3.3v, all digital outputs have good 3.3v levels of "high", but this pins show about 1.8v spi voltage level.  Input current of hmc on high level 65ua from datasheet. Interesting,  that than i saw to 10 le siganls,  which atmega drives 1output to one le input of each hmc,  i saw same picture,  levels were 1.8...2.0V. Can you tell me what is going on?  Thank you,  George Krotov