why not ENOB in date sheet for AD9224 or AD9225

why not have  ENOB in date sheet for AD9224 or AD9225

  • 0
    •  Analog Employees 
    on Dec 30, 2016 9:03 PM

    Hello,

    The ENOB can be easily calculated from the SINAD specification using following formula   ENOB= (SINAD-1.76)/6.02.   SINAD for the AD9224 and AD9225  is  68.3 dB/ 70.7 dB respectively for a 2.5 MHz input.   Using the formula above, the ENOB for the AD9224 and AD9225 is 11- and 11.5 ENOB's respectively.

    *Note, the datasheet does not indicate amplitude of full-scale sine used for testing which is likely to be -0.5 dBFS.  Typically one uses the SINAD specification relative to dBFS to determine ENOB.  If it were possible to confirm that testing was done at -0.5 dBFS back-off then one should have added 0.5 dB to the SINAD numbers to normalize specification to dBFS.

    Regards.