AD5758 datasheet(29/72 Pages) AD

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Data Sheet

AD5758

Rev. 0 | Page 29 of 72

TERMINOLOGY

Total Unadjusted Error (TUE)

TUE is a measure of the output error taking all the various

errors into account, namely INL error, offset error, gain error,

and output drift over supplies, temperature, and time. TUE is

expressed in % FSR.

Relative Accuracy or Integral Nonlinearity (INL)

For the DAC, relative accuracy, or INL, is a measure of the

maximum deviation, in LSBs or % FSR, from the best fit line

passing through the DAC transfer function.

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 monoton-

icity. This DAC is guaranteed monotonic by design.

Monotonicity

A DAC is monotonic if the output either increases or remains

constant for increasing digital input code. The AD5758 is

monotonic over its full operating temperature range.

Zero-Scale/Negative Full-Scale Error

Zero-scale/negative full-scale error is the error in the DAC

output voltage when 0x0000 (straight binary coding) is loaded

to the DAC output register.

Zero-Scale Temperature Coefficient (TC)

Zero-scale TC is a measure of the change in zero-scale error

with a change in temperature. Zero-scale error TC is expressed

in ppm FSR/°C.

Bipolar Zero Error

Bipolar zero error is the deviation of the analog output from the

ideal half-scale output of 0 V when the DAC output register is

loaded with 0x8000 (straight binary coding).

Bipolar Zero Temperature Coefficient (TC)

Bipolar zero TC is a measure of the change in the bipolar zero

error with a change in temperature. It is expressed in ppm FSR/°C.

Offset Error

Offset error is the deviation of the analog output from the ideal and

is measured using ¼ scale and ¾ scale digital code measurements.

It is expressed in % FSR.

Offset Error (TC)

Offset error TC is a measure of the change in the offset error

with a change in temperature. It is expressed in ppm FSR/°C.

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 in % FSR.

Gain Error Temperature Coefficient (TC)

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

changes in temperature. Gain error TC is expressed in

ppm FSR/°C.

Full-Scale Error

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

code is loaded to the DAC output register. Ideally, the output is

full-scale − 1 LSB. Full-scale error is expressed in % FSR.

Headroom

This is the difference between the voltage required at the output

(programmed voltage in voltage output mode and programmed

current × RLOAD in current output mode) and the voltage supplied

by the positive supply rail, VDPC+. Headroom is relevant when

the output is positive with respect to ground.

Footroom

Footroom is the difference between the voltage required at

the output (programmed voltage in voltage output mode and

programmed current × RLOAD in current output mode) and the

voltage supplied by the negative supply rail, AVSS. Footroom is

relevant when the output is negative with respect to ground.

VOUT/−VSENSE Common-Mode Rejection Ratio (CMRR)

VOUT/−VSENSE CMRR is the error in VOUT voltage due to changes

in –VSENSE voltage.

Current Loop Compliance Voltage

The maximum voltage at the VIOUT pin for which the output

current is equal to the programmed value.

Voltage Reference TC

Voltage reference TC is a measure of the change in the reference

output voltage with a change in temperature. The reference TC

is calculated using the box method, which defines the TC as the

maximum change in the reference output over a given temperature

range expressed in ppm/°C, as follows:





















TempRange

NOM

REF

MIN

REF

MAX

REF

where:

VREF_MAX

is the maximum reference output measured over the

total temperature range.

VREF_MIN

is the minimum reference output measured over the

total temperature range.

VREF_NOM

is the nominal reference output voltage, 2.5 V.

TempRange

is the specified temperature range, −40°C to

+115°C.

Line Regulation

Line regulation is the change in reference output voltage due to

a specified change in power supply voltage. It is expressed in

ppm/V.

Load Regulation

Load regulation is the change in reference output voltage due to

a specified change in reference load current. It is expressed in

ppm/mA.

AD5758 Datasheet(PDF) 29 Page - Analog Devices

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