Frequency Response Effects of Overampling and Averaging



Part  Number XRDAN28
Manufacturer Exar Corporation
Semiconductor DataSheet

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www.DataSheet4U.com                   ) 4   !    ! %  Figure 2. +!        ,  !  !  # !       % ! ! )     (0 12-*# !       !   #  )  # !    53 12- +!             !!  (! ) *           Results         ) ! $     Graph 1. 6 !      ! -    !     # %!!    !    6 !    )  ! "     +!  )     ) ! $        !   "        !  ! +!  )      !            Conclusion +!       !     $"    )     )   %! !      7   !  %     !  !   !    7      "           "    ! !      +! )  -  ! $    !!        !         "     +!      ) -   ! "         % 8 DOUT (s)/DIN (s)=(1•exp(•N*s/F S ))/(N(1•exp(•s/F S ))) %!# &9    (   * 9    (   * # ,9 & +!    )         !         )        "   +!         "&"     XRDAN28 Introduction    !!     !!  "              # "   !  ! $      "  %!  & '       $         ! "     (%!!  !     %   )       !  )*  "  !!   %           +!      $  )  "   !     # !  #     !!  +!   ! ,   (!   " * !)  !     !    + #  ) !     !   (!  -*  ! +! !!       )  )     !   !       !   %"    +!   #  . /#      )         !    +! $  ! "   !    ( *        !         !  )     !   +!      %          ) % Example I (See Figure 1.) +!      ! $       0 12-     # %  %     !          3 12- +!    )  3 12-   ) 4   !    ! %  Figure 1. +!        ,  !  !  # !      ) (0 12-*#    #  ) % # !    3 12- +!            "            Example II (see Figure 2.) +!      ! $       0 12-     #    %     !          53 12- +!    )  3 12-    XRDAN28  " 7,(* 0 12&  0 12  : :  3 12&  ;+ Equivalent Systems e 7,( * • S 30MHz : :  ;+(&* ;+(&*< 3 12- D OUT (S) = A IN (S) 1 • (1 + e 2 • S 30 MHz ) Figure 1. Two Samples Averaged  "0 " " 0 12&   : : 7,(*  : : = 53 12&  ;+ 0 12- Equivalent Systems e 7,( * • 3• S 30MHz • 2• S 30MHz • S 30MHz e e : : : : = ;+(&* ;+(&*< 53 12- D OUT (S) = A IN (S) 1 • (1 + e 4 • S 30 MHz + e • 2• S 30 MHz + e 30 MHz ) • 3• S Figure 2. Four Samples Averaged    XRDAN28  A/D SAMPLE RATE•30 MHz   &  ?  = &   @53 12 @3 12- A (;+   7,* > =   12DOUT2 12DOUT4 12- 012- =12- 312- >12-  Graph 1. Decimation Filter Frequency Response   0 XRDAN28 Notes   =



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