I've been using an Arduino to communicate with an AD5446 in the AD5443/46/53 Eval Board. I was able to communicate to one chip, sending it 16 bits and receiving the correlated voltage. However, I tried to send it 32 bits, so the first 16 bits would ripple out to the SDO line, but when I measured it, nothing came out of the oscilloscope. It seems to still read the last 16 bits, IE, if I were to send it 0FFF3FFF, it still reads the 3FFF and changes it, but the 0FFF doesn't appear on the SDO line. Does anyone know why nothing is showing out of the SDO line?