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AD9927 データシート(Datasheet) 12 Page - Analog Devices |
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12 page 
AD9927 Rev. 0 | Page 12 of 100 TERMINOLOGY Differential Nonlinearity (DNL) An ideal ADC exhibits code transitions that are exactly 1 LSB apart. DNL is the deviation from this ideal value. Therefore, every code must have a finite width. No missing codes guaranteed to 14-bit resolution indicates that all 16,384 codes, each for its respective input, must be present over all operating conditions. Peak Nonlinearity Peak nonlinearity, a full signal chain specification, refers to the peak deviation of the output of the AD9927 from a true straight line. The point used as zero scale occurs 0.5 LSB before the first code transition. Positive full scale is defined as a level 1 LSB and 0.5 LSB beyond the last code transition. The deviation is measured from the middle of each particular output code to the true straight line. The error is then expressed as a percentage of the 2 V ADC full-scale signal. The input signal is always appropriately gained up to fill the ADC’s full-scale range. Total Output Noise The rms output noise is measured using histogram techniques. The standard deviation of the ADC output codes is calculated in LSB and represents the rms noise level of the total signal chain at the specified gain setting. The output noise can be converted to an equivalent voltage using the relationship 1 LSB = (ADC Full Scale/2n Codes) where n is the bit resolution of the ADC. For the AD9927, 1 LSB is 0.122 mV. Power Supply Rejection (PSR) The PSR is measured with a step change applied to the supply pins. The PSR specification is calculated from the change in the data outputs for a given step change in the supply voltage. |
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