Datenblatt-Suchmaschine für elektronische Bauteile |
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AD7356 Datenblatt(PDF) 11 Page - Analog Devices |
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AD7356 Datenblatt(HTML) 11 Page - Analog Devices |
11 / 20 page AD7356 Rev. 0 | Page 11 of 20 Total Harmonic Distortion (THD) THD is the ratio of the rms sum of harmonics to the fundamental. For the AD7356, it is defined as () 1 6 5 4 3 2 V V V V V V THD 2 2 2 2 2 log 20 dB + + + + − = where: V1 is the rms amplitude of the fundamental. V2, V3, V4, V5, and V6 are the rms amplitudes of the second through the sixth harmonics. Spurious Free Dynamic Range (SFDR) SFDR is 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 (IMD) With inputs consisting of sine waves at two frequencies, fa and fb, any active device with nonlinearities creates 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 is 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 and 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 decibels. 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 Thermal hysteresis is expressed in ppm using the following equation: 6 10 ) 25 ( ) _ ( ) 25 ( ) ppm ( × ° − ° = C V HYS T V C V V REF REF REF HYS where: VREF(25°C) is VREF at 25°C. VREF(T_HYS) is the maximum change of VREF at T_HYS+ or T_HYS–. |
Ähnliche Teilenummer - AD7356_08 |
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Ähnliche Beschreibung - AD7356_08 |
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