AD9754ARURL7 datasheet(6/24 Pages) AD

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AD9754

–6–

REV. A

DEFINITIONS OF SPECIFICATIONS

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, determined by a

straight line drawn from zero to full scale.

Differential Nonlinearity (or 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.

Offset Error

The deviation of the output current from the ideal of zero is

called offset error. 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

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 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 T

MIN 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

The maximum change in the full-scale output as the supplies

are varied over a specified range.

Settling Time

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 pV-s.

Spurious-Free Dynamic Range

The difference, in dB, between the rms amplitude of the output

signal and the peak spurious signal over the specified bandwidth.

Total Harmonic Distortion

THD is the ratio of the sum of the rms value of the first six

harmonic components to the rms value of the measured output

signal. It is expressed as a percentage or in decibels (dB).

Multitone Power Ratio

The spurious-free dynamic range for an output containing mul-

tiple carrier tones of equal amplitude. It is measured as the

difference between the rms amplitude of a carrier tone to the

peak spurious signal in the region of a removed tone.

150pF

+1.20V REF

AVDD

ACOM

REFLO

ICOMP

PMOS

CURRENT SOURCE

ARRAY

SEGMENTED SWITCHES

FOR DB13–DB5

LSB

SWITCHES

REFIO

FS ADJ

DVDD

DCOM

CLOCK

+5V

RSET

0.1 F

DVDD

DCOM

IOUTA

IOUTB

0.1 F

AD9754

SLEEP

RETIMED

CLOCK

OUTPUT*

LATCHES

DIGITAL

DATA

TEKTRONIX AWG-2021

w/OPTION 4

LECROY 9210

PULSE GENERATOR

CLOCK

OUTPUT

20pF

100

TO HP3589A

SPECTRUM/

NETWORK

ANALYZER

INPUT

MINI-CIRCUITS

T1-1T

* AWG2021 CLOCK RETIMED

SUCH THAT DIGITAL DATA

TRANSITIONS ON FALLING EDGE

OF 50% DUTY CYCLE CLOCK.

+5V

Figure 2. Basic AC Characterization Test Setup

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