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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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AD7621 Fiches technique(PDF) 11 Page - Analog Devices |
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AD7621 Fiches technique(HTML) 11 Page - Analog Devices |
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11 / 32 page  AD7621 Rev. 0 | Page 11 of 32 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 LSBs 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. Gain Error The first transition (from 000…00 to 000…01) should occur for an analog voltage ½ LSB above the nominal negative full-scale (−2.0479688 V for the ±2.048 V range). The last transition (from 111…10 to 111…11) should occur for an analog voltage 1½ LSBs below the nominal full-scale (2.0479531 V for the ±2.048 V range). The gain error is the deviation of the difference between the actual level of the last transition and the actual level of the first transition from the difference between the ideal levels. Zero Error The zero error is the difference between the ideal midscale input voltage (0 V) and the actual voltage producing the midscale output code. Dynamic Range Dynamic range is the ratio of the rms value of the full-scale to the rms noise measured with the inputs shorted together. The value for dynamic range is expressed in decibels. 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 + 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 (dB), 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 is expressed in bits by ENOB = [(SINADdB − 1.76)/6.02] Aperture Delay Aperture delay is a measure of the acquisition performance measured from the falling edge of the CNVST input to when the input signal is held for a conversion. Transient Response The time required for the AD7621 to achieve its rated accuracy after a full-scale step function is applied to its input. Reference Voltage Temperature Coefficient Reference voltage temperature coefficient is derived from the typical shift of output voltage at 25°C on a sample of parts at the maximum and minimum reference output voltage (VREF) measured at TMIN, T(25°C), and TMAX. It is expressed in ppm/°C as 6 MIN MAX REF REF REF REF 10 ) T – T ( ) 25 ( V ) ( V – ) ( V ) ( TCV × × ° = ° C C ppm/ Min Max where: VREF (Max) = maximum VREF at TMIN, T (25°C), or TMAX VREF (Min) = minimum VREF at TMIN, T (25°C), or TMAX VREF (25°C) = VREF at 25°C TMAX = +85°C TMIN = –40°C |
Numéro de pièce similaire - AD7621_15 |
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Description similaire - AD7621_15 |
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