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AD977ABRZ Datasheet(PDF) 7 Page - Analog Devices |
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AD977ABRZ Datasheet(HTML) 7 Page - Analog Devices |
7 / 24 page AD977/AD977A –7– REV. D DEFINITION OF SPECIFICATIONS 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 1/2 LSB before the first code transition. “Positive full scale” is defined as a level 1 1/2 LSB beyond the last code transition. The deviation is measured from the middle of each particular 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 011 . . . 10 to 011 . . . 11 for two’s complement format) should occur for an analog voltage 1 1/2 LSB below the nominal full scale (9.9995422 V for a ±10 V range). The full-scale error is the deviation of the actual level of the last transition from the ideal level. BIPOLAR ZERO ERROR Bipolar zero error is the difference between the ideal midscale input voltage (0 V) and the actual voltage producing the midscale output code. UNIPOLAR ZERO ERROR In unipolar mode, the first transition should occur at a level 1/2 LSB above analog ground. Unipolar zero error is the devia- tion of the actual transition from that point. SPURIOUS FREE DYNAMIC RANGE The difference, in decibels (dB), between the rms amplitude of the input signal and the peak spurious signal. TOTAL HARMONIC DISTORTION (THD) THD is the ratio of the rms sum of the first six harmonic com- ponents to the rms value of a full-scale input signal and is expressed in decibels. SIGNAL TO (NOISE AND DISTORTION) (S/[N+D]) RATIO S/(N+D) is the ratio of the rms value of the measured input signal to the rms sum of all other spectral components below the Nyquist frequency, including harmonics but excluding dc. The value for S/(N+D) is expressed in decibels. FULL POWER BANDWIDTH The full power bandwidth is defined as the full-scale input fre- quency at which the S/(N+D) degrades to 60 dB, 10 bits of accuracy. APERTURE DELAY Aperture delay is a measure of the acquisition performance, and is measured from the falling edge of the R/ C input to when the input signal is held for a conversion. TRANSIENT RESPONSE The time required for the AD977/AD977A to achieve its rated accuracy after a full-scale step function is applied to its input. OVERVOLTAGE RECOVERY The time required for the ADC to recover to full accuracy after an analog input signal 150% of full-scale is reduced to 50% of the full-scale value. |
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