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Data Sheet

AD9704/AD9705/AD9706/AD9707

Rev. D | Page 29 of 42

TERMINOLOGY

Linearity Error (Integral Nonlinearity or INL)

INL 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 digital-to-analog converter 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 1.

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

ideal gain is calculated using the measured VREF. Therefore,

the gain error does not include effects of the reference.

Output Compliance Range

Output compliance 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 (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 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 picovolt-seconds (pV-s).

Spurious-Free Dynamic Range (SFDR)

SFDR is 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).

Multitone Power Ratio

Multitone power ratio is the spurious-free dynamic range

containing multiple 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.

Noise Spectral Density (NSD)

Noise spectral density is the average noise power normalized to

a 1 Hz bandwidth, with the DAC converting and producing an

output tone.

0.1µF

DIGITAL DATA

SOURCE DPG

DIGITAL

DATA

LATCHES

CURRENT

SOURCE

ARRAY

SLEEP/CSB

SPI

IOUTB

IOUTA

OTCM

REFIO

FS ADJ

CLKVDD

CLKCOM

CLOCK

OUTPUT

CLK–

CLK+

ACOM

AVDD

DVDD

DCOM

1.0V REF

1.7V TO 3.6V

AD9707

Ω

JTX-4-10T+

ADT4-6T+

Ω

LSB

SWITCHES

SEGMENTED

SWITCHES

RSET

16k

Ω

1.7V TO 3.6V

AD9512

CLK1

CLKB

1.7V TO 3.6V

LOW JITTER

RF SOURCE

Figure 70. Basic AC Characterization Test Setup

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