AD5413 datasheet(23/49 Pages) AD

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Data Sheet

AD5413

Rev. 0 | Page 23 of 49

TERMINOLOGY

Total Unadjusted Error (TUE)

TUE is a measure of the output error that takes into account

various errors including 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 from the best fit line passing through the

DAC transfer function. INL is expressed either in LSBs or % FSR.

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 a ±1 LSB maximum ensures

monotonicity.

Monotonicity

A DAC is monotonic if the output either increases or remains

constant for increasing digital input code. The AD5413 is

monotonic over the full operating temperature range.

Zero-Scale or Negative Full-Scale Error

Zero-scale, or 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

Zero-scale temperature coefficient is a measure of the change in

the zero-scale error with a change in temperature. Zero-scale

error temperature coefficient 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

Bipolar zero temperature coefficient is a measure of the change

in the bipolar zero error with a change in temperature. Bipolar

zero temperature coefficient 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. Offset error is expressed in % FSR.

Offset Error Temperature Coefficient

Offset error temperature coefficient is a measure of the change

in the offset error with a change in temperature. Offset error

temperature coefficient is expressed in ppm FSR/°C.

Gain Error

Gain error is a measure of the span error of the DAC and is the

DAC transfer characteristic slope deviation from the ideal

value. Gain error is expressed in % FSR.

Gain Error Temperature Coefficient

Gain error temperature coefficient is a measure of the change

in gain error with changes in temperature. Gain error

temperature coefficient 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.

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

VOUT or −VSENSE CMRR is the error in VOUT that occurs because

of changes in −VSENSE.

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, then to +105°C, and then back to +25°C.

Reference Temperature Coefficient

Voltage reference temperature coefficient is a measure of the

change in the reference output voltage with a change in

temperature. To calculate the voltage reference temperature

coefficient, use the box method. This method defines the

temperature coefficient as the maximum change in the reference

output over a given temperature range expressed in ppm/°C, and

is calculated as follows:













REF MAX

REF MIN

REF NOM

VTemperature Range

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, which in this

case is 2.5 V.

Temperature Range is the specified temperature range, −40°C

to +105°C.

Line Regulation

Line regulation is the change in reference output voltage that

occurs because of a specified change in power supply voltage.

Line regulation is expressed in ppm/V.

Load Regulation

Load regulation is the change in reference output voltage that

occurs because of a specified change in reference load current.

Load regulation is expressed in ppm/mA.

Output Voltage Settling Time

Output voltage settling time is the amount of time the output

takes to settle to a specified level for a full-scale input change.

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