AD9739-R2-EBZ datasheet(17/48 Pages) AD

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Data Sheet

AD9739

Rev. B | Page 17 of 48

TERMINOLOGY

Linearity Error (Integral Nonlinearity or INL)

The maximum deviation of the actual analog output from the

ideal output, determined by a straight line drawn from 0 to

full scale.

Differential Nonlinearity (DNL)

The measure of the variation in analog value, normalized to full

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

Monotonicity

A DAC is monotonic if the output either increases or remains

constant as the digital input increases.

Offset Error

The deviation of the output current from the ideal of 0 is called

the offset error. For IOUTP, 0 mA output is expected when the

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

inputs are set to 1.

Gain Error

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.

Output Compliance Range

The range of allowable voltage at the output of a current output

DAC. Operation beyond the maximum compliance limits may

cause either output stage saturation or breakdown, resulting in

nonlinear performance.

Temperature Drift

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.

Power Supply Rejection (PSR)

The maximum change in the full-scale output as the supplies

are varied from nominal to minimum and maximum specified

voltages.

Spurious-Free Dynamic Range (SFDR)

The difference, in decibels (dB), between the rms amplitude of

the output signal and the peak spurious signal over the specified

bandwidth.

Total Harmonic Distortion (THD)

The ratio of the rms sum of the first six harmonic components

to the rms value of the measured input signal. It is expressed as

a percentage or in decibels (dB).

Noise Spectral Density (NSD)

NSD is the converter noise power per unit of bandwidth. This

is usually specified in dBm/Hz in the presence of a 0 dBm

full-scale signal.

Adjacent Channel Leakage Ratio (ACLR)

The adjacent channel leakage (power) ratio is a ratio, in dBc, of the

measured power within a channel relative to its adjacent channels.

Modulation Error Ratio (MER)

Modulated signals create a discrete set of output values referred

to as a constellation. Each symbol creates an output signal

corresponding to one point on the constellation. MER is a

measure of the discrepancy between the average output symbol

magnitude and the rms error magnitude of the individual symbol.

Intermodulation Distortion (IMD)

IMD is the result of two or more signals at different frequencies

mixing together. Many products are created according to the

formula, aF1 ± bF2, where a and b are integer values.

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