AD9753AST datasheet(7/28 Pages) AD

7 / 28 page

REV. B

AD9753

–7–

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, 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 D/A converter is monotonic if the output either increases or

remains constant as the digital input increases.

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

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

degree Celsius. For reference drift, the drift is reported in ppm

per degree Celsius.

Power Supply Rejection

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

are varied from minimum to maximum specified voltages.

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)

THD is the ratio of the rms sum of the first six harmonic com-

ponents to the rms value of the measured fundamental. It is

expressed as a percentage or in decibels (dB).

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 Power Ratio (ACPR)

A ratio in dBc between the measured power within a channel

relative to its adjacent channel.

AD9753

IOUTA

IOUTB

SEGMENTED

SWITCHES FOR

DB0 TO DB11

DAC

FSADJ

REFIO

1.2V REF

CLK+

PLLLOCK

DIGITAL DATA INPUTS

0.1 F

RSET

MINI

CIRCUITS

T1-1T

TO ROHDE &

SCHWARZ

FSEA30

SPECTRUM

ANALYZER

DB0 – DB11

TEKTRONIX DG2020

AWG2021 w/OPTION 4

LECROY 9210

PULSE GENERATOR

(FOR DATA RETIMING)

DCOM

PMOS CURRENT

SOURCE ARRAY

AVDD

3.0V TO 3.6V

DVDD

2–1 MUX

PORT 1 LATCH

DAC LATCH

ACOM

PORT 2 LATCH

CLK–

PLL

CIRCUITRY

PLLVDD

CLKVDD

RESET

LPF

CLKCOM

DIV0

DIV1

DB0 – DB11

MINI

CIRCUITS

T1-1T

3.0V TO 3.6V

HP8644

SIGNAL

GENERATOR

PLL ENABLED

PLL DISABLED

Figure 2. Basic AC Characterization Test Setup

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