AD5753 datasheet(29/75 Pages) AD

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Data Sheet

ADFS5758

Rev. 0 | Page 29 of 75

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

monotonicity.

Monotonicity

A DAC is monotonic if the output either increases or remains

constant for increasing digital input code. The ADFS5758 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

Headroom 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 Thermal Hysteresis

Voltage reference thermal hysteresis is the difference in output

voltage measured at 25°C compared to the output voltage

measured at 25°C after cycling the temperature from 25°C

to −40°C to +105°C and then back to 25°C.

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

+105°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.

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