Question
Could you clarify more regarding the SDO pin? When is the SDO pin in tristate?What is the SDO pin state when sync signal @ “high” level?
Answer
Using the Eval-AD5522EBUZ, the following results were generated.
Before doing the experiment, I first made sure the part was working and forcingout 2V, and I also removed the R13 and probed at the pad connected to theAD5522 SDO pin to ensure that the only impedance I am seeing will come from thepart only. Then toggling the CS between DVDD and GND gave interesting results.
If CS is HIGH, the Ohmeter reads 31.92Mohm which is already equivalent to aTRISTATE.If CS is LOW, the Ohmeter reads 29.71 Ohm.