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AD9942BBCZ Folha de dados(PDF) 11 Page - Analog Devices |
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AD9942BBCZ Folha de dados(HTML) 11 Page - Analog Devices |
11 / 36 page AD9942 Rev. A | Page 11 of 36 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 12-bit resolution indicates that all 4096 codes 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 AD9942 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 AD9942, 1 LSB is approximately 122.0 μV. 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. Matching Error The matching error refers to the Channel A to Channel B mismatch after post-ADC correction calibration has been applied to remove gain error between Channel A and Channel B. Crosstalk The crosstalk is measured while applying a full-scale step to one channel and measuring the interference on the opposite channel. ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ × = 384 , 16 ) ( log 20 ) dB ( LSB ce Interferen Crosstalk |
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Descrição semelhante - AD9942BBCZ |
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