ADS5525 datasheet(49/60 Pages) TI2

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Signal-to-Noise Ratio

SNR + 10Log

10 Ps

(4)

Signal-to-Noise and Distortion (SINAD)

SINAD + 10Log

N ) PD

(5)

Effective Number of Bits (ENOB)

ENOB +

SINAD * 1.76

6.02

(6)

Total Harmonic Distortion (THD)

THD + 10Log

10 Ps

(7)

Spurious-Free Dynamic Range (SFDR)

Two-Tone Intermodulation Distortion

DC Power Supply Rejection Ratio (DC PSRR)

ADS5525

SLWS191B – JULY 2006 – REVISED MAY 2007

DEFINITION OF SPECIFICATIONS (continued)

SNR is the ratio of the power of the fundamental (PS) to the noise floor power (PN), excluding the power at dc

and the first nine harmonics.

SNR 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’s

full-scale range.

SINAD is the ratio of the power of the fundamental (PS) to the power of all the other spectral components

including noise (PN) and distortion (PD), but excluding dc.

SINAD 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’s

full-scale range.

The ENOB is a measure of a converter’s performance as compared to the theoretical limit based on quantization

noise.

THD is the ratio of the power of the fundamental (PS) to the power of the first nine harmonics (PD).

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

The ratio of the power of the fundamental to the highest other spectral component (either spur or harmonic).

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

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

fundamental is extrapolated to the converter’s full-scale range.

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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