REV. 0

AD9709

–6–

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.

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

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.

AVDD

DIGITAL

DATA

DB0-DB7

GAINCTRL

50

DVDD

DCOM

RETIMED CLOCK OUTPUT

LECROY 9210

PULSE

GENERATOR

TEKTRONIX

AWG-2021

w/OPTION 4

WRT1/

IQWRT

1.2V REF

2k

CHANNEL 1 LATCH

CHANNEL 2 LATCH

PMOS

CURRENT

SOURCE

ARRAY

PMOS

CURRENT

SOURCE

ARRAY

SEGMENTED

SWITCHES

FOR DAC1

SEGMENTED

SWITCHES FOR

DAC2

LSB

SWITCH

LSB

SWITCH

MULTIPLEXING LOGIC

AD9709

DCOM ACOM

MODE

SLEEP

CLK2/

IQRESET

CLK1/

IQCLK

5V

FSADJ1

2k

REFIO

0.1 F

FSADJ2

DB0-DB7

WRT2/

IQSEL

50

5V

MINI CIRCUITS

T1-1T

TO HP3589A

SPECTRUM/

NETWORK

ANALYZER

*AWG2021 CLOCK RETIMED SUCH THAT DIGITAL DATA TRANSITIONS

ON FALLING EDGE OF 50% DUTY CYCLE CLOCK

DVDD

DAC2

LATCH

DAC1

LATCH

CLK

DIVIDER

50

Figure 2. Basic AC Characterization Test Setup for AD9709, Testing Port 1 in Dual Port Mode, Using Independent

GAINCTRL Resistors on FSADJ1 and FSADJ2

Temperature Drift

Temperature drift is specified as the maximum change from the

ambient (25

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

range (FSR) per degree C. For reference drift, the drift is

reported in ppm per degree C.

Power Supply Rejection

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

are varied from nominal to minimum and 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 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).