AD5044 datasheet(14/24 Pages) AD

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AD5066

Rev. A | Page 14 of 24

TERMINOLOGY

Relative Accuracy or Integral Nonlinearity (INL)

Relative accuracy or INL is a measure of the maximum

deviation in LSBs from a straight line passing through the

endpoints of the DAC transfer function. Figure 4, Figure 5,

and Figure 6 show typical INL vs. code plots.

Differential Nonlinearity (DNL)

DNL is the difference between the measured change and the

ideal 1 LSB change between any two adjacent codes. A specified

differential nonlinearity of ±1 LSB maximum ensures mono-

tonicity. Figure 7, Figure 8, and Figure 9 show typical DNL vs.

code plots.

Zero-Code Error

Zero-code error is a measure of the output error when zero

code (0x0000) is loaded into the DAC register. Ideally, the

output should be 0 V. The zero-code error is always positive in

the AD5066, because the output of the DAC cannot go below

0 V. Zero-code error is expressed in millivolts. Figure 17 shows

a typical zero-code error vs. supply voltage plot.

Gain Error

Gain error is a measure of the span error of the DAC. It is the

deviation in slope of the DAC transfer characteristic from the

ideal, expressed as a percentage of the full-scale range.

Gain Error Drift

Gain error drift is a measure of the change in gain error with

changes in temperature. It is expressed in (ppm of full-scale

range)/°C.

Zero-Code Error Drift

Zero-code error drift is a measure of the change in zero-code

error with a change in temperature. It is expressed in microvolts

per degrees Celsius.

Full-Scale Error

Full-scale error is a measure of the output error when a full-

scale code (0xFFFF) is loaded into the DAC register. Ideally, the

output should be VREF − 1 LSB. Full-scale error is expressed as a

percentage of the full-scale range.

Digital-to-Analog Glitch Impulse

Digital-to-analog glitch impulse is the impulse injected into the

analog output when the input code in the DAC register changes

state. It is normally specified as the area of the glitch in nanovolts

per second and is measured when the digital input code is

changed by 1 LSB at the major carry transition (0x7FFF to

0x8000). See Figure 28.

DC Power Supply Rejection Ratio (PSRR)

DC PSRR indicates how the output of the DAC is affected by

changes in the supply voltage. DC PSRR is the ratio of the

change in VOUT to a change in VDD for full-scale output of the

DAC. It is measured in decibels.

DC Crosstalk

DC crosstalk is the dc change in the output level of one DAC in

response to a change in the output of another DAC. It is measured

with a full-scale output change on one DAC (or soft power-down

and power-up) while monitoring another DAC kept at midscale.

It is expressed in microvolts.

Reference Feedthrough

Reference feedthrough is the ratio of the amplitude of the signal

at the DAC output to the reference input when the DAC output

is not being updated (that is, LDAC

Digital Feedthrough

is high). It is expressed in

decibels.

Digital feedthrough is a measure of the impulse injected into

the analog output of a DAC from the digital input pins of the

device but is measured when the DAC is not being written to

(SYNC

Digital Crosstalk

held high). It is specified in nanovolts per second and

measured with one simultaneous DIN and SCLK pulse loaded

to the DAC.

Digital crosstalk is the glitch impulse transferred to the output

of one DAC at midscale in response to a full-scale code change

(all 0s to all 1s or vice versa) in the input register of another

DAC. It is measured in standalone mode and is expressed in

nanovolts per second.

Analog Crosstalk

Analog crosstalk is the glitch impulse transferred to the output

of one DAC due to a change in the output of another DAC. It is

measured by loading one of the input registers with a full-scale

code change (all 0s to all 1s or vice versa) while keeping LDAC

high and then pulsing

DAC-to-DAC Crosstalk

LDAC low and monitoring the output of

the DAC whose digital code has not changed. The area of the

glitch is expressed in nanovolts per second.

DAC-to-DAC crosstalk is the glitch impulse transferred to the

output of one DAC due to a digital code change and subsequent

output change of another DAC. This includes both digital and

analog crosstalk. It is measured by loading one of the DACs

with a full-scale code change (all 0s to all 1s or vice versa) with

LDAC

Total Harmonic Distortion (THD)

low and monitoring the output of another DAC. The

energy of the glitch is expressed in nanovolts per second.

THD is the difference between an ideal sine wave and its

attenuated version using the DAC. The sine wave is used as

the reference for the DAC, and the THD is a measure of the

harmonics present on the DAC output. It is measured in

decibels.

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