I have tried programming the LMX2571 so that it is in FSK I2S mode, and it seems that i am sending data correctly to the device. The carrier signal is created and accurate, but clocking in data doesn't output any modulation. I have set FSK_MODE_SEL1 to 1, FSK_MODE_SEL0 to 0, and FSK_EN_F1 to 1 as the data sheet describes for setting to I2S mode. I am sending data (16 bits) on the low side of the frame and have set FSK_I2S_FS_POL correctly based on that as well, but it seems that I am missing something in the set up still. Is there something I am maybe over-looking in the set up of this device?
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