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AD5934YRSZ Fiches technique(PDF) 10 Page - Analog Devices |
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AD5934YRSZ Fiches technique(HTML) 10 Page - Analog Devices |
10 / 32 page AD5934 Rev. 0 | Page 10 of 32 TERMINOLOGY Total System Accuracy The AD5934 can accurately measure a range of impedance values to less than 0.5% of the correct impedance value for supply voltages between 2.7 V to 5.5 V. Spurious-Free Dynamic Range (SFDR) Along with the frequency of interest, harmonics of the fundamental frequency and images of these frequencies are present at the output of a DDS device. The spurious-free dynamic range refers to the largest spur or harmonic present in the band of interest. The wideband SFDR gives the magnitude of the largest harmonic or spur relative to the magnitude of the fundamental frequency in the 0 to Nyquist bandwidth. The narrow-band SFDR gives the attenuation of the largest spur or harmonic in a bandwidth of ±200 kHz, about the fundamental frequency. Signal-to-Noise Ratio (SNR) SNR is the ratio of the rms value of the measured output signal to the rms sum of all other spectral components below the Nyquist frequency. The value for SNR is expressed in decibels. Total Harmonic Distortion (THD) THD is the ratio of the rms sum of harmonics to the fundamental, where V1 is the rms amplitude of the fundamental and V2, V3, V4, V5, and V6 are the rms amplitudes of the second through the sixth harmonics. For the AD5934, THD is defined as 1 6 5 4 3 2 V V V V V V THD 2 2 2 2 2 log 20 ) db ( + + + + = |
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