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THD + 10Log10

ADS5521

www.ti.com ...................................................................................................................................................... SBAS309D – MAY 2004 – REVISED OCTOBER 2008

Total Harmonic Distortion (THD)

Two-Tone Intermodulation Distortion (IMD3)

THD is the ratio of the power of the fundamental (PS)

IMD3 is the ratio of the power of the fundamental (at

to the power of the first eight harmonics (PD).

frequencies f1 and f2) to the power of the worst

spectral component at either frequency 2f1 – f2 or

2f2 –f1. IMD3 is either given in units of dBc (dB to

carrier) when the absolute power of the fundamental

is used as the reference, or dBFS (dB to Full-Scale)

THD is typically given in units of dBc (dB to carrier).

when the power of the fundamental is extrapolated to

Spurious-Free Dynamic Range (SFDR)

the converter's full-scale range.

The ratio of the power of the fundamental to the

DC Power Supply Rejection Ration (DC PSRR)

highest other spectral component (either spur or

The DC PSSR is the ratio of the change in offset

harmonic). SFDR is typically given in units of dBc (dB

error to a change in analog supply voltage. The DC

to carrier).

PSRR is typically given in units of mV/V.

Reference Error

The reference error is the variation of the actual

reference voltage (VREFP - VREFM) from its ideal

value. The reference error is typically given as a

percentage.

Voltage Overload Recovery Time

The voltage overload recovery time is defined as the

time required for the ADC to recover to within 1% of

the full-scale range in response to an input voltage

overload of 10% beyond the full-scale range.

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