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AD7357 датащи(PDF) 10 Page - Analog Devices |
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AD7357 датащи(HTML) 10 Page - Analog Devices |
10 / 17 page AD7357 Preliminary Technical Data Rev. PrD | Page 10 of 17 Peak Harmonic or Spurious Noise Peak harmonic or spurious noise is defined as the ratio of the rms value of the next largest component in the ADC output spectrum (up to fS/2 and excluding dc) to the rms value of the fundamental. Normally, the value of this specification is determined by the largest harmonic in the spectrum, but for ADCs where the harmonics are buried in the noise floor, it is a noise peak Intermodulation Distortion With inputs consisting of sine waves at two frequencies, fa and fb, any active device with nonlinearities will create distortion products at sum and difference frequencies of mfa ± nfb where m, n = 0, 1, 2, 3, and so on. Intermodulation distortion terms are those for which neither m nor n are equal to zero. For example, the second-order terms include (fa + fb) and (fa − fb), while the third-order terms include (2fa + fb), (2fa − fb), (fa + 2fb), and (fa − 2fb). The AD7356 is tested using the CCIF standard where two input frequencies near the top end of the input bandwidth are used. In this case, the second-order terms are usually distanced in frequency from the original sine waves, while the third-order terms are usually at a frequency close to the input frequencies. As a result, the second- and third-order terms are specified separately. The calculation of the intermodulation distortion is as per the THD specification, where it is the ratio of the rms sum of the individual distortion products to the rms amplitude of the sum of the fundamentals expressed in dBs. 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–. |
Аналогичный номер детали - AD7357 |
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Аналогичное описание - AD7357 |
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