I looked for a technical explanation of what the interpolation filter does but I could not find anything specific enough.
Because the FIR85 filter has a 90% filter bandwidth, the top 10% of the Nyquist band cannot be used, whereas in a native 12 GSPS DAC, that top 10% could be used. When considering practical analog reconstruction filters, however, the use of the AD9161/AD9162 with FIR85 is equivalent to a native 12 GSPS DAC because a realizable reconstruction filter would likely need that 90% cutoff for a transition band.
Great. thanks for that. any technical document/paper to recommend on the theory of the filter - so how the interpolation FIR amounts to multiplying sampling rate by 2 - other than the datasheet ? I have found a couple things about interpolation filters and upsampling but if you have a particularly good one in mind, i'm interested
Please check page 3.23 of the Data Conversion Handbook for a succinct explanation of interpolation and its advantages.
Thanks for the link , but it seems (at least for me ) that the realization of fir85 is different than the ordinary fir. Can you please elaborate on this fir85 specifically ?
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