AD9765AST datasheet(20/44 Pages) AD

20 / 44 page

AD9763/AD9765/AD9767

Data Sheet

Rev. G | Page 20 of 44

TERMINOLOGY

Linearity Error (Integral Nonlinearity or INL)

Linearity error 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 DAC 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 IOUTA, 0 mA output is expected when the inputs are all 0s.

For IOUTB, 0 mA output is expected when all inputs are set to 1s.

Gain Error

Gain error is the difference between the actual and ideal output

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

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

Output Compliance Range

The output compliance range is 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

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 part per million (ppm)

of full-scale range (FSR) per degree Celsius. For reference drift,

the drift is reported in ppm per degree Celsius (ppm/°C).

Power Supply Rejection (PSR)

PSR is the maximum change in the full-scale output as the

supplies are varied from nominal to minimum and maximum

specified voltages.

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.

Glitch Impulse

Asymmetrical switching times in a DAC give rise to undesired

output transients that are quantified by a glitch impulse. It is

specified as the net area of the glitch in picovolts per second (pV-s).

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)

THD is 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).

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