AD5381 datasheet(17/40 Pages) AD

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Data Sheet

AD5381

Rev. D | Page 17 of 40

TERMINOLOGY

Relative Accuracy

Relative accuracy, or endpoint linearity, is a measure of the

maximum deviation froma straight line passing through the

endpoints of the DAC transfer function. It is measuredafter

adjusting for zero-scale error and full-scale error, and is

expressedin LSB.

Differential Nonlinearity

Differential nonlinearity is the difference betweenthe measured

change and the ideal 1 LSB change between any two adjacent

codes. A specified differential nonlinearity of 1 LSB maximum

ensures monotonicity.

Zero-Scale Error

Zero-scale error is the errorin the DAC output voltagewhen all

0s are loaded into the DAC register. Ideally, with all 0s loaded

to the DAC and m = all 1s, c = 2n – 1

VOUT

(Zero-Scale) = 0 V

Zero-scale error is a measureof the difference between VOUT

(actual) and VOUT (ideal), expressed in mV. It is mainly due to

offsets in the output amplifier.

Offset Error

Offset error is a measure of the differencebetween VOUT

(actual) and VOUT (ideal)in the linear region of the transfer

function, expressed in mV. Offset error is measured on the

AD5381-5 with Code 32 loaded into the DAC register, and on

the AD5381-3 with Code 64.

Gain Error

Gain Error is specified in the linear region of the output range

between VOUT= 10 mV and VOUT = AVDD – 50 mV. It is

the deviation in slope of the DAC transfer characteristicfrom

the ideal and is expressedin %FSR with the DAC output

unloaded.

DC Crosstalk

This is the dc change in the output level of one DAC at

midscale in response to a full-scale code(all 0s to all 1s, and

vice versa)and output change of all other DACs.It is expressed

in LSB.

DC Output Impedance

This is the effective output source resistance.It is dominated by

package lead resistance.

Output Voltage SettlingTime

This is the amount of time it takes for the output of a DAC to

settle to a specified level for a ¼ to ¾ full-scale input change,

and is measuredfrom the BUSYrising edge.

Digital-to-AnalogGlitch Energy

This is the amount of energy injected into the analog output at

the major code transition. It is specified as the area of the glitch

in nV-s. It is measuredby toggling the DAC registerdata

between 0x7FF and 0x800.

DAC-to-DAC Crosstalk

DAC-to-DACcrosstalkis the glitch impulse that appearsat the

output of one DAC due to both the digital change and the

subsequent analog output change at another DAC. The victim

channel is loaded with midscale. DAC-to-DACcrosstalkis

specified in nV-s.

Digital Crosstalk

The glitch impulse transferred to the output of one converter

due to a change in the DAC register code of another converter

is defined as the digital crosstalkand is specified in nV-s.

Digital Feedthrough

When the device is not selected, high frequency logicactivity

on the device’s digital inputs can be capacitively coupled both

across and through the device to show up as noise on the

VOUT pins. It can also be coupled along the supply and

ground lines. This noise is digital feedthrough.

Output Noise Spectral Density

This is a measure of internally generatedrandomnoise.

Random noise is characterized as a spectral density (voltageper

√Hertz). It is measured by loading all DACs to midscaleand

measuring noise at the output. It is measured in nV/√Hzin a

1 Hz bandwidth at 10 kHz.

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