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Spectrum problem of AD9162 output

Category: Hardware
Product Number: AD9162

When AD9162 output 1.9G single tune,the spectrum :

1. AD9162 configures: DAC clock=4GHz,FIR85=1,interpolation=1,nco_en=0,complex data on 204b interface(2G samplerate).

2. AD9162 configures: DAC clock=4GHz,FIR85=1,interpolation=0,nco_en=0,real data on 204b interface(4G samplerate).

My question is: Why is the amplitude of the image frequency so high? It seems that the suppression of FIR85 has no effect. What are the possible reasons for this phenomenon?



correct the output frequency
[edited by: hanlilei at 9:34 AM (GMT -4) on 31 Jul 2024]