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Forum Post: RE: DAC5689 Real IF inteface - Independant & Differenct frequency plane

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Hi,

The input bandwidth of the DAC is limited by the FIR1 (2x interpolator) low pass filter limit. To generate 75MHz, you will need data rate higher than 100MSPS. I suggest that you use 200MSPS input rate and 4x interpolation to allow enough input bandwidth for the 75MHz.

See section 4 of the following app note for detail:

http://www.ti.com/lit/an/slaa523a/slaa523a.pdf

-Kang


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