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AD7667 データシート(PDF) 11 Page - Analog Devices |
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AD7667 データシート(HTML) 11 Page - Analog Devices |
11 / 28 page AD7667 Rev. 0 | Page 11 of 28 DEFINITIONS 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 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 011…10 to 011…11 in twos comple- ment coding) should occur for an analog voltage 1½ LSB below the nominal full scale (2.49994278 V for the 0 V to 2.5 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 (19.073 µV for the 0 V to 2.5 V range). Unipolar zero error is the deviation of the actual transition from that point. Spurious-Free Dynamic Range (SFDR) SFDR is 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 S/(N+D) and is expressed in bits by the following formula: ENOB = (S/[N+D]dB – 1.76)/6.02 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 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. Signal-to-(Noise + Distortion) Ratio (S/[N+D]) S/(N+D) 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 S/(N+D) is expressed in decibels. Aperture Delay Aperture delay is a measure of the acquisition performance and is measured from the falling edge of the CNVST input to when the input signal is held for a conversion. Transient Response Transient response is the time required for the AD7667 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 maximum and minimum reference output voltage (VREF) measured at TMIN, T(25°C), and TMAX. It is expressed in ppm/°C using the following equation: 6 10 ) – ( ) C 25 ( ) – ) ) C ppm/ ( × × ° = ° MIN MAX REF REF REF REF T T V Min ( V Max ( V TCV 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 Thermal Hysteresis Thermal hysteresis is defined as the absolute maximum change of reference output voltage after the device is cycled through temperature from either T_HYS+ = 25°C to TMAX to 25°C T_HYS– = 25°C to TMIN to 25°C It is expressed in ppm using the following equation: 6 10 ) 25 ( ) _ ( ) 25 ( ) ( × ° − ° = C V HYS T V C V ppm V REF REF REF HYS where: VREF(25°C) = VREF at 25°C VREF(T_HYS) = Maximum change of VREF at T_HYS+ or T_HYS– |
同様の部品番号 - AD7667_15 |
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同様の説明 - AD7667_15 |
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