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I finally managed to get the EVM running with an Arduino and so far everything looks like it is working fine. I am able to get appropriate magnitude and phase values at a single frequency without any issue in the IQ mode.
As mentioned in the data sheet, I noticed that when the frequency is changed in the IQ mode the output data becomes very non-deterministic. The datasheet (section 8.1.3) suggests either 1. doing a fresh calibration or 2. using an SPI synchronous with the device clock. I had a couple of questions on both approaches.
It looks like both I and Q changes when the frequency is changed. I understand that magnitude should be calibrated because of the variation in gain etc. but the phase values look drastically different. Does this mean I should calculate the phase offset and add it to all the values? I haven't tested this but I am assuming it should work.
I need to look into creating a synchronous SPI system but I was wondering why a sufficient delay will not work. Can I do the following to get it to work : disable IQ_MODE, write the DAC Frequency and IQ_DEMOD_CLK_DIV_FAC values, provide a couple of ms worth of delay and reenable IQ_MODE?
I am getting a bit confused on how an SPI synchronous to the device clock would work. Is there a timing diagram someone can share?
P.S. For everyone trying to get an Arduino(powered at 5V) to interface with the AFE4300 EVM, make sure every signal is pulled down to 3.3V. I used a simple voltage divider circuit with 3 10Ohms
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