AD9726 datasheet(10/24 Pages) AD

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AD9726

Rev. A | Page 10 of 24

TERMINOLOGY

Integral Nonlinearity (INL)

The maximum deviation of the actual analog output from the

ideal output, as determined by a straight line drawn from zero

scale to full scale.

Differential Nonlinearity (DNL)

A measure of the maximum deviation in analog output associated

with any single value change in the digital input code relative to

an ideal LSB.

Offset Error

The deviation of the output current from the ideal zero-scale

current. For differential outputs, 0 mA is expected at IOUTA when

all inputs are low, and 0 mA is expected at IOUTB when all inputs

are high.

Monotonicity

A DAC is monotonic if the analog output increases or remains

constant in response to an increase in the digital input.

Gain Error

The deviation of the output current from the ideal full-scale

current. Actual full-scale output current is determined by

subtracting the output when all inputs are low from the output

when all inputs are high.

Output Compliance Range

The range of allowable voltage seen by the analog output of a

current output DAC. Operation beyond the compliance limits

may cause output stage saturation and/or breakdown resulting

in nonlinear performance.

Temperature Drift

Temperature drift is specified as the maximum change in a

parameter from ambient temperature (25°C) to either TMIN

or TMAX and is typically reported as ppm/°C.

Power Supply Rejection

The maximum change in the full-scale output as all power

supplies are varied over their respective operating voltage range.

Spurious-Free Dynamic Range (SFDR)

The difference in decibels between the peak amplitude of a test

tone and the peak amplitude of the largest spurious signal over

the specified bandwidth.

Intermodulation Distortion (IMD)

The difference in decibels between the maximum peak

amplitude of two test tones and the maximum peak amplitude

of the distortion products created from the sum or difference

of integer multiples of the test tones.

Adjacent Channel Leakage Ratio (ACLR)

The ratio between the measured power of a wideband signal

within a channel relative to the measured power in an empty

adjacent channel.

Noise Spectral Density (NSD)

The measured noise power over a 1 Hz bandwidth seen at the

analog output.

Total Harmonic Distortion (THD)

The ratio in decibels of the rms power sum of the first six

harmonic components to the rms power of the output signal.

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