AD9119BBCZ datasheet(35/66 Pages) AD

35 / 66 page

Data Sheet

AD9119/AD9129

Rev. B | Page 35 of 66

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 zero 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 zero.

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 degree

Celsius (°C). For reference drift, the drift is reported in ppm per °C.

Power Supply Rejection

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

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)

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 ratio, in dBc, between the measured power within a channel

relative to its adjacent channels.

Adjacent Channel Power Ratio (ACPR)

The ratio, in dBc, between the total power of an adjacent channel

(intermodulation signal) to the main channel's power (useful

signal).

Modulation Error Ratio (MER)

A measure of the discrepancy between the average output

symbol magnitude and the rms error magnitude of the individual

symbol. Modulated signals create a discrete set of output values

referred to as a constellation, and each symbol creates an output

signal corresponding to one point on the constellation.

Intermodulation Distortion (IMD)

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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