I'm having trouble trying to verify that the device is measuring correctly when I tell it to do so.
I tried to replicate the information from page 15 of 32 of the datasheet but I don't get the expected results whatever I try to do. I connected a 200k resistor from Vout to Vin in place of Zunknown and a 200k resistor from Vin to RFB. PGA I set to a gain of 1, Vout range is the 2Vp-p one, Vdd=3.3V, and signal frequency 30kHz. System clock is set to external, roughly 8MHz (not that it matters, setting to internal does not work, if I don't plug anything to MCLK I don't get any output signal on Vout). I kinda followed the flowchart of fig. 24, but what I managed to read is a value arround 19700 for the magnitude, and I've changed to higher value resistors but no significant change in readings.
Did you get ACK from the device without any external clock?
Did you reset the device? Bit D4.
Not sure about your controller but in this forum there are quite a lot examples with the AD5933 that you may use.
Yes, I reset the device first.
Didn't pay attention to ACK when I tried internal clock...