ADS5522IPAP datasheet(12/32 Pages) TI

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ADS5522

SBAS320C – MAY 2004 – REVISED FEBRUARY 2007

Spurious-Free Dynamic Range (SFDR)

Reference Error

The ratio of the power of the fundamental to the

The reference error is the variation of the actual

highest other spectral component (either spur or

reference voltage (V(REFP)– V(REFM)) from its ideal

harmonic). SFDR is typically given in units of dBc

value. The reference error is typically given as a

(dB to carrier).

percentage.

Two-Tone Intermodulation Distortion (IMD3)

Voltage Overload Recovery Time

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

The voltage overload recovery time is defined as the

frequencies f1 and f2) to the power of the worst

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

spectral component at either frequency 2f1 – f2 or

the full-scale range in response to an input voltage

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

overload of 10% beyond the full-scale range.

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's 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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