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AD7760 Programable FIR Filter Coefficients

Question asked by cyang on Nov 26, 2013
Latest reply on Dec 3, 2013 by cyang

Could please any one tell me how to verify the FIR Filter Coefficients provided in AD7760 spec sheet in MATLAB?

I try to visualize the frequency response of those 48 filter coefficients, but it's totally different from the frequency response figure provided in the Spec sheet in page 30 and 31 (24 coefficients).

 

The following is my MATLAB code: Please let me know if i forgot to apply something, or I did something wrong,

 

Coeff=[

    53656736  

25142688  

-4497814  

-11935847 

-1313841  

6976334   

3268059   

-3794610  

-3747402 

1509849   

3428088  

80255     

-2672124  

-1056628 

1741563   

1502200  

-835960   

-1528400  

93626    

1269502   

411245    

-864038  

-664622  

434489

  700847

  -70922

  -583959

  -175934

  388667

  294000

  -183250

  -302597

  16034

  238315

  88266

  -143205

  -128919

  51794

  121875

  16426

  -90524

  -63899

  45234

  114720

  102357

  52669

  15559

  1963 ];

 

fvtool(Coeff,1)

 

Thanks so much.

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