DAC8408

–7–

REV. A

Timing Diagram

AC FEEDTHROUGH ERROR

the DAC output with all switches off.

SETTLING TIME

Settling Time is the time required for the output function of the

DAC to settle to within 1/2 LSB for a given digital input signal.

PROPAGATION DELAY

This is a measure of the internal delays of the DAC. It is defined

as the time from a digital input change to the analog output cur-

rent reaching 90% of its final value.

CHANNEL-TO-CHANNEL ISOLATION

This is the portion of input signal that appears at the output of a

DAC from another DAC’s reference input. It is expressed as a

ratio in dB.

DIGITAL CROSSTALK

Digital Crosstalk is the glitch energy transferred to the output of

one DAC due to a change in digital input code from other

DACs. It is specified in nVs.

PARAMETER DEFINITIONS

RESOLUTION

Resolution is the number of states (2

(FSR) of a DAC is divided (or resolved) into.

NONLINEARITY

Nonlinearity (Relative Accuracy) is a measure of the maximum

deviation from a straight line passing through the end-points of

the DAC transfer function. It is measured after adjusting for

ideal zero and full-scale and is expressed in LSB, %, or ppm of

full-scale range.

DIFFERENTIAL NONLINEARITY

Differential Nonlinearity is the worst case deviation of any adja-

cent analog outputs from the ideal 1 LSB step size. A specified

differential nonlinearity of

±1 LSB maximum over the operating

temperature range ensures monotonicity.

GAIN ERROR

Gain Error (full-scale error) is a measure of the output error be-

tween the ideal and actual DAC output. The ideal full-scale

OUTPUT CAPACITANCE