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Original question:

AFE4300: Frequencies IQ mode is supported

AFE4300: Frequencies IQ mode is supported

byronleehua
Prodigy 20 points

Part Number: AFE4300

after reading the datasheet of AFE4300, I have a question about the setup of the registers.

It is about the relation between the he frequency of the BCM excitation current source and I/Q demodulator clock frequency. In datasheet of sbas586c,page 28, the relation is defined by the equation IQ_DEMOD_CLK = fCLK / (IQ_DEMOD_CLK_DIV_FAC) =BCM_DAC_FREQ × 4. Is there miss a coeffcient of 1024? IQ_DEMOD_CLK_DIV_FAC only has six predefined values.Is the eqution right?

  • 0
    TI__Guru 50036 points
    Hi Byron,

    Yes, the equation is correct.
    The IQ demodulator clock divider can only be set to divide by 2, 4, 8, 16, or 32 and the IQ demodulator clock must be 4 times the BCM DAC frequency.
  • 0 in reply to Praveen Aroul
    Prodigy 20 points

    thanks a lot!

    I still have a question about  the ADC measurement mode selection.

    In the register of ADC_CONTROL_REGISTER1,the ADC measurement mode selection have three options:

    000 --->A1,A2=differential(default)

    001 --->A1, AVSS = single-ended

    010 --->A2, AVSS = single-ended

    In IQ mode, which option should be chooosen?

    and the choice depend on what?