AD5384BBC-5 datasheet(17/36 Pages) AD

17 / 36 page

AD5384

Rev. A | Page 17 of 36

TERMINOLOGY

Relative Accuracy

Relative accuracy or endpoint linearity is a measure of the

maximum deviation from a straight line passing through the

endpoints of the DAC transfer function. It is measured after

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

expressed in LSB.

Differential Nonlinearity

Differential nonlinearity 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 monotonicity.

Zero-Scale Error

Zero-scale error is the error in the DAC output voltage when 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 measure of 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 difference between VOUT

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

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

AD5384-5 with Code 32 loaded into the DAC register, and on

the AD5384-3 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 characteristic from the

ideal and is expressed in %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 Settling Time

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 measured from the BUSY rising edge.

Digital-to-Analog Glitch 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 measured by toggling the DAC register data

between 0x1FFF and 0x2000.

DAC-to-DAC Crosstalk

DAC-to-DAC crosstalk is the glitch impulse that appears at the

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

sequent analog output change at another DAC. The victim

channel is loaded with midscale. DAC-to-DAC crosstalk is

specified in nV-s.

Digital Crosstalk

Digital crosstalk is the glitch impulse transferred to the output

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

another converter. It is specified is specified in nV-s.

Digital Feedthrough

When the device is not selected, high frequency logic activity

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 generated random noise. Random

noise is characterized as a spectral density (voltage per √Hertz).

It is measured by loading all DACs to midscale and measuring

noise at the output. It is measured in nV/√Hz in a 1 Hz band-

width at 10 kHz.

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