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Data Sheet

AD9993

Rev. A | Page 15 of 56

TERMINOLOGY

Linearity Error (Integral Nonlinearity or INL)

INL is defined as the maximum deviation of the actual analog

output from the ideal output, determined by a straight line

drawn from zero to full scale.

Differential Nonlinearity (DNL)

DNL is the measure of the variation in analog value, normalized

to full scale, associated with a 1 LSB change in digital input code.

Monotonicity

A digital-to-analog converter is monotonic if the output either

increases or remains constant as the digital input increases.

Offset Error

Offset error is the deviation of the output current from the ideal

of zero. For IOUTx_P, 0 mA output is expected when the inputs

are all 0s. For IOUTx_N, 0 mA output is expected when all

inputs are set to 1.

Gain Error

Gain error is the difference between the actual and ideal output

span. The actual span is determined by the output when all inputs

are set to 1, minus the output when all inputs are set to 0. The

ideal gain is calculated using the measured VREF. Therefore,

the gain error does not include effects of the reference.

Output Compliance Voltage

Output compliance voltage is the range of allowable voltage

at the output of a current output DAC. Operation beyond the

maximum compliance limits can cause either output stage

saturation or breakdown, resulting in nonlinear performance.

Temperature Drift

Temperature drift is specified as the maximum change from

the ambient (25°C) value to the value at either TMIN or TMAX.

For offset and gain drift, the drift is reported in ppm of full-

scale range (FSR) per °C. For reference drift, the drift is

reported in ppm per °C.

Settling Time

Settling time is the time required for the output to reach and

remain within a specified error band about its final value,

measured from the start of the output transition.

Spurious-Free Dynamic Range (SFDR)

SFDR is the difference, in decibels (dB), between the rms

amplitude of the output signal and the peak spurious signal

over the specified bandwidth.

Noise Spectral Density (NSD)

Noise spectral density is the average noise power normalized to

a 1 Hz bandwidth, with the DAC converting and producing an

output tone.

Signal-to-Noise Ratio (SNR)

SNR is the ratio of the rms value of the measured output signal

to the rms sum of all other spectral components below the

Nyquist frequency, excluding the first six harmonics and dc.

The value for SNR is expressed in decibels.

Signal to Noise and Distortion (SINAD)

The ratio of the total signal power level (wanted signal + noise +

distortion or SND) to unwanted signal power (noise +

distortion or ND).

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