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AD7675 Datasheet(PDF) 11 Page - Analog Devices |
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AD7675 Datasheet(HTML) 11 Page - Analog Devices |
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11 / 28 page  AD7654 Rev. B | Page 11 of 28 TERMINOLOGY Integral Nonlinearity Error (INL) Linearity error refers to the deviation of each individual code from a line drawn from negative full scale through positive full scale. The point used as negative full scale occurs ½ LSB before the first code transition. Positive full scale is defined as a level 1½ LSB beyond the last code transition. The deviation is measured from the middle of each code to the true straight line. Differential Nonlinearity Error (DNL) In an ideal ADC, code transitions are 1 LSB apart. Differential nonlinearity is the maximum deviation from this ideal value. It is often specified in terms of resolution for which no missing codes are guaranteed. Full-Scale Error The last transition (from 111. . .10 to 111. . .11) should occur for an analog voltage 1½ LSB below the nominal full scale (4.999886 V for the 0 V to 5 V range). The full-scale error is the deviation of the actual level of the last transition from the ideal level. Unipolar Zero Error The first transition should occur at a level ½ LSB above analog ground (76.29 μV for the 0 V to 5 V range). The unipolar zero error is the deviation of the actual transition from that point. Signal-to-Noise Ratio (SNR) SNR is the ratio of the rms value of the actual input signal to the rms sum of all other spectral components below the Nyquist frequency, excluding harmonics and dc. The value for SNR is expressed in decibels. Total Harmonic Distortion (THD) THD is the ratio of the rms sum of the first five harmonic components to the rms value of a full-scale input signal and is expressed in decibels. Signal-to-Noise and Distortion Ratio (SINAD) SINAD is the ratio of the rms value of the actual input signal to the rms sum of all other spectral components below the Nyquist frequency, including harmonics but excluding dc. The value for SINAD is expressed in decibels. Spurious-Free Dynamic Range (SFDR) The difference, in decibels, between the rms amplitude of the input signal and the peak spurious signal. Effective Number of Bits (ENOB) ENOB is a measurement of the resolution with a sine wave input. It is related to SINAD and expressed in bits by ENOB = ((SINADdB − 1.76)/6.02) and is expressed in bits. Aperture Delay Aperture delay is a measure of acquisition performance and is measured from the falling edge of the CNVST input to when the input signals are held for a conversion. Transient Response The time required for the AD7654 to achieve its rated accuracy after a full-scale step function is applied to its input. |
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