AD9744 데이터 시트보기 (PDF) - Analog Devices

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AD9744

14-Bit, 210 MSPS TxDAC D/A converter

Analog Devices 

AD9744

TERMINOLOGY

Linearity Error (Also Called Integral Nonlinearity or INL)

It 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 DAC 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 the 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

It 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.

3.3V

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)

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

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 spuri-

ous signal in the region of a removed tone.

DVDD

DCOM

0.1µF

RSET

2kΩ 3.3V

REFLO

1.2V REF

REFIO

FS ADJ

150pF

AVDD

ACOM

AD9744

PMOS

CURRENT SOURCE

ARRAY

DVDD

DCOM

SEGMENTED SWITCHES

FOR DB13–DB5

LSB

SWITCHES

IOUTA

IOUTB

CLOCK

50Ω

SLEEP

LATCHES

MODE

RETIMED

50Ω

CLOCK

OUTPUT*

CLOCK

DIGITAL

DATA

LECROY 9210

OUTPUT

TEKTRONIX AWG-2021

PULSE GENERATOR

WITH OPTION 4

MINI-CIRCUITS

T1-1T

RHODE & SCHWARZ

FSEA30

SPECTRUM

ANALYZER

50Ω

*AWG2021 CLOCK RETIMED

SO THAT THE DIGITAL DATA

TRANSITIONS ON FALLING EDGE

OF 50% DUTY CYCLE CLOCK.

Figure 5. Basic AC Characterization Test Set-Up (SOIC/TSSOP Packages)

Rev. B | Page 8 of 32

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