AD9772A-EB datasheet(12/40 Pages) AD

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AD9772A

Rev. C | Page 12 of 40

TERMINOLOGY

Linearity Error (Also Called Integral Nonlinearity or INL)

Linearity error is defined as the maximum deviation of the

actual analog output from the ideal output and is 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 that is 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

span. 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 ppm of full-scale range (FSR)

per °C. For reference drift, the drift is reported in ppm per °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 about its final value. It is

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 pV-s.

Spurious-Free Dynamic Range

Spurious-free dynamic range is the difference, in decibels,

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 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.

Pass Band

Pass band is the frequency band in which any input applied

therein passes unattenuated to the DAC output.

Stop-Band Rejection

Stop-band rejection is the amount of attenuation of a frequency

outside the pass band applied to the DAC relative to a full-scale

signal applied at the DAC input within the pass band.

Group Delay

Group delay is the number of input clocks between an impulse

applied at the device input and the peak DAC output current.

Impulse Response

Impulse response is the response of the device to an impulse

applied to the input.

Adjacent-Channel Power Ratio (ACPR)

ACPR is a ratio, in dBc, between the measured power within a

channel relative to its adjacent channel.

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