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AFE7071: will this support only I- channel input

rajesh kumar
Prodigy 10 points
Part Number: AFE7071

Tool/software:

in AFE7071 expects Interleaved I-Q data for the QMC to operate. the sync is done by IQ_Flag input. 

in the design the input has only real data. So if only I -data is given without Q data , what could be done to get the DAC ouput with acceptable distortions? 

  • 0
    TI__Intellectual 2700 points

    Hello, 

    This will work just fine. As you have a real signal however you will have both upper and lower sideband images after mixing if you use the included up-converter. 

    There are two ways to do this from a data input perspective. 

    1. Set Q = I. You will need to ensure that sqrt(I^2 + Q^2) < 2^14 (Basically ensure the I/Q vector is within the unit circle). This essentially sets I and Q at 45 degrees. 

    2. Set Q = 0. This sets I and Q phase to 0 degrees. 

    Any type of QMC correction will also have no effect as this is not a Quadrature signal. 

    Hope this helps, 

    Matt