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AD7923BRUZ-REEL Datasheet(PDF) 11 Page - Analog Devices |
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AD7923BRUZ-REEL Datasheet(HTML) 11 Page - Analog Devices |
11 / 24 page AD7923 Rev. C | Page 11 of 24 Signal-to-(Noise + Distortion) (SINAD) Ratio This is the measured ratio of SINAD at the output of the ADC. The signal is the rms amplitude of the fundamental. Noise is the sum of all nonfundamental signals up to half the sampling frequency (fS/2), excluding dc. The ratio is dependent on the number of quantization levels in the digitization process, the more levels, the smaller the quantization noise. The theoretical SINAD ratio for an ideal N-bit converter with a sine wave input is given by SINAD = (6.02N + 1.76) dB Thus for a 12-bit converter, this is 74 dB. Total Harmonic Distortion (THD) THD is the ratio of the rms sum of harmonics to the fundamental. For the AD7923, it is defined as 1 2 6 2 5 2 4 2 3 2 2 log 20 ) ( V V V V V V dB THD + + + + = 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. |
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