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ADF4360 SPI Configuration question - 4 SPI writes required vs. 3?

Question asked by Lionelwallace Employee on Oct 6, 2014
Latest reply on Oct 6, 2014 by rbrennan

I received this customer question:


I have a question regarding the ADF9360-X series PLLs.  In the datasheet for these devices It is stated that three bytes should be sent via SPI to configure the different registers on the device. When I send three bytes the PLL will not program properly. After using a logic analyzer on the demo board I discovered that the MCU that controls the PLL actually sends *four* bytes. After replicating this behavior I am able to successfully program the device. Any idea what is going on here?