ADS5541IPAP datasheet(13/37 Pages) TI1

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THD + 10Log10

(4)

Production Data

ADS5541

SBAS307C – MAY 2004 – REVISED FEBRUARY 2007

Total Harmonic Distortion (THD)

Reference Error

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

The reference error is the variation of the actual

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

reference voltage (VREFP – VREFM) from its ideal

value. The reference error is typically given as a

percentage.

Voltage Overload Recovery Time

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

The voltage overload recovery time is defined as the

Spurious-Free Dynamic Range (SFDR)

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

the full-scale range in response to an input voltage

The ratio of the power of the fundamental to the

overload of 10% beyond the full-scale range.

highest other spectral component (either spur or

harmonic). SFDR is typically given in units of dBc

AC Power-Supply Rejection Ratio (AC PSRR)

(dB to carrier).

The ratio of output spectral power at a given

Two-Tone Intermodulation Distortion (IMD3)

frequency with respect to the injected ac-power on

AVDD at that frequency. The rejected ac-input

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

amplitude should be limited to less than 100mVPP.

frequencies f1 and f2) to the power of the worst

The PSRR is typically given in units of dB.

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)

when the power of the fundamental is extrapolated to

the converter full-scale range.

DC Power-Supply Rejection Ration (DC PSRR)

The DC PSSR is the ratio of the change in offset

error to a change in analog supply voltage. The DC

PSRR is typically given in units of mV/V.

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