C8051F52x-53x
5.6.7. Total Harmonic Distortion (THD)
The total harmonic distortion is the ratio of the sum of the powers of the first five harmonics of the funda-
mental frequency (10 kHz single ended sine-wave input set to 1 dB below full scale) in dB. The following
formula defines THD:
Ah12 + Ah22 + Ah32 + Ah42 + Ah52
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THD =
Af
Where Ahn is the amplitude of the n-th harmonic of the fundamental frequency and Af is the amplitude of
the fundamental frequency.
5.6.8. Spurious Free Dynamic Range (SFDR)
The spurious free dynamic range measures the ratio in amplitude of the fundamental signal (10 kHz single
ended sine-wave input set to 1 dB below full scale) and the largest spur (harmonic or not) from dc to half of
the sampling rate (Nyquist Rate) in dB.
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SILICON [ SILICON ]
