AD9716-EBZ datasheet(29/48 Pages) AD

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AD9714/AD9715/AD9716/AD9717

Rev. 0 | Page 29 of 48

TERMINOLOGY

Linearity Error or Integral Nonlinearity (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 scale 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 IOUTP, 0 mA output is expected when the

inputs are all 0. For IOUTN, 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 difference between

the output when all inputs are set to 1 and the output when all

inputs are set to 0.

Output Compliance Range

Output compliant range 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 value (25°C) to the value at either TMIN or TMAX.

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

scale range per degree Celsius (ppm FSR/°C). For reference

drift, the drift is reported in parts per million per degree

Celsius (ppm/°C).

Power Supply Rejection

Power supply rejection is the maximum change in the full-scale

output as the supplies are varied from minimum to maximum

specified voltages.

Settling Time

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

remain within a specified error band around its final value,

measured from the start of the output transition.

Spurious Free Dynamic Range (SFDR)

SFDR is the difference, in decibels, between the peak amplitude

of the output signal and the peak spurious signal between dc

and the frequency equal to half the input data rate.

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 fundamental.

It is expressed as a percentage or in decibels.

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.

Adjacent Channel Leakage Ratio (ACLR)

ACLR is the ratio in dBc between the measured power within

a channel relative to its adjacent channel.

Complex Image Rejection

In a traditional two-part upconversion, two images are created

around the second IF frequency. These images have the effect of

wasting transmitter power and system bandwidth. By placing

the real part of a second complex modulator in series with the

first complex modulator, either the upper or lower frequency

image near the second IF can be rejected.

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