AD5372BSTZ datasheet(14/28 Pages) AD

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AD5372/AD5373

Rev. C | Page 14 of 28

TERMINOLOGY

Integral Nonlinearity (INL)

Integral nonlinearity, 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 least significant bits (LSB).

Differential Nonlinearity (DNL)

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. Zero-scale error is a

measure of the difference between VOUT (actual) and VOUT

(ideal), expressed in millivolts, when the channel is at its mini-

mum value. Zero-scale error is mainly due to offsets in the

output amplifier.

Full-Scale Error

Full-scale error is the error in the DAC output voltage when

all 1s are loaded into the DAC register. Full-scale error is a

measure of the difference between VOUT (actual) and VOUT

(ideal), expressed in millivolts, when the channel is at its maxi-

mum value. Full-scale error does not include zero-scale error.

Gain Error

Gain error is the difference between full-scale error and

zero-scale error. It is expressed as a percentage of the full-

scale range (FSR).

Gain Error = Full-Scale Error − Zero-Scale Error

VOUT Temperature Coefficient

The VOUT temperature coefficient includes output error

contributions from linearity, offset, and gain drift.

DC Output Impedance

DC output impedance is the effective output source resistance.

It is dominated by package lead resistance.

DC Crosstalk

The DAC outputs are buffered by op amps that share common

VDD and VSS power supplies. If the dc load current changes in

one channel (due to an update), this change can result in a

further dc change in one or more channel outputs. This effect is

more significant at high load currents and is reduced as the load

currents are reduced. With high impedance loads, the effect is

virtually immeasurable. Multiple VDD and VSS terminals are

provided to minimize dc crosstalk.

Output Voltage Settling Time

Output voltage settling time is the amount of time it takes for

the output of a DAC to settle to a specified level for a full-scale

input change.

Digital-to-Analog Glitch Energy

Digital-to-analog glitch energy is the amount of energy that is

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 0x7FFF and 0x8000

(AD5372) or 0x1FFF and 0x2000 (AD5373).

Channel-to-Channel Isolation

Channel-to-channel isolation refers to the proportion of input

signal from the reference input of one DAC that appears at the

output of another DAC operating from another reference. It is

expressed in decibels and measured at midscale.

DAC-to-DAC Crosstalk

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

the output of one converter due to both the digital change

and subsequent analog output change at another converter. It

is specified in nV-s.

Digital Crosstalk

Digital crosstalk is defined as 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 in nV-s.

Digital Feedthrough

When the device is not selected, high frequency logic activity

on the digital inputs of the device can be capacitively coupled

both across and through the device to appear 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

Output noise spectral density is a measure of internally

generated random noise. Random noise is characterized as a

spectral density (voltage per √Hz). It is measured by loading

all DACs to midscale and measuring noise at the output. It is

measured in nV/√Hz.

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