CS5180

19

PARAMETER DEFINITIONS

Differential Non-Linearity Error - DNL

The deviation of a code’s width from ideal. Units in LSBs.

Integral Non-Linearity Error - INL

The deviation of a code from a straight line passing through the endpoints of the transfer

function after zero- and full-scale errors have been accounted for. "Zero-scale" is a point 1/2

LSB below the first code transition and "full-scale" is a point 1/2 LSB beyond the code

transition to all ones. The deviation is measured from the middle of each particular code. Units

in LSB’s.

Full-Scale Error - FSEP

The deviation of the last code transition from the ideal (VREF-3/2 LSB’s). Units in LSB’s.

Offset Error - VOS

The deviation of the mid-scale transition from the ideal (1/2 LSB below 0 Volts). Units in

LSB’s.

Spurious-Free-Dynamic-Range - SFDR

The ratio of the rms value of the full-scale signal, to the rms value of the next largest spectral

component (excepting dc). This component is often an aliased harmonic when the signal

frequency is a significant proportion of the sampling rate. Units in dBc (decibels relative to the

carrier).

Total Harmonic Distortion - THD

The ratio of the rms sum of the significant harmonics (2nd through 7th), to the rms value of the

full-scale signal. Units in decibels.

Dynamic Range - DR

The ratio of the rms value of the inferred full-scale signal, to the rms sum of the broadband

noise signals below the Nyquist rate (excepting dc and distortion terms).

Expressed in

decibels. Dynamic Range is tested with a 22 kHz input signal 60 dB below full scale. 60 dB

is then added to the resulting number to refer the noise level to the full-scale signal. This

technique ensures that the distortion components are below the noise level and do not affect the

measurement.

Signal-to-Noise-and-Distortion (s/[n+d]) - SINAD

The ratio of the rms value of the full-scale signal, to the rms sum of all other spectral

components below the Nyquist rate (excepting dc), including distortion components. Expressed

in decibels.

Group Delay

The time delay through the digital filter section of the part. Units in seconds.