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Data Sheet

AD3530/AD3530R

TERMINOLOGY

analog.com

Rev. 0 | 19 of 45

Relative Accuracy or Integral Nonlinearity (INL)

For the DAC, relative accuracy or integral nonlinearity is a meas-

urement of the maximum deviation, in LSBs, from a straight line

passing through the endpoints of the DAC transfer function.

Differential Nonlinearity (DNL)

Differential nonlinearity is the difference between the measured

change and the ideal 1 LSB change between any two adjacent

codes.

Offset Error

Offset error is a measure of the difference between VOUT (actual)

and VOUT (ideal) expressed in mV in the linear region of the transfer

function. Offset error is measured with Code 256 loaded in the DAC

Offset Error Drift

The offset error drift is a measurement of the relative variation of

the offset with temperature. It is expressed in ppm/°C. Total offset at

a given temperature is calculated as

Deviation

at T=Deviation at 25°C

+TC×T−25×VRANGE

106

Full-Scale and Zero-Scale Error

These errors measure the deviation from the ideal value at full

scale and zero scale, at 25°C. The error is expressed as % of

full-scale range (FSR).

Full-Scale and Zero-Scale Error Drift

These parameters measure the variation of the zero-scale and

full-scale voltage as a function of the temperature, relative to the

ideal zero-scale and full-scale voltages. They are expressed in

ppm/°C. The total deviation over temperature is calculated using

the same equation as offset error drift.

DC PSRR and AC PSRR

PSRR indicates how the output of the DAC is affected by changes

in the supply voltage. PSRR is the ratio of the change in VOUT to

a change in the supplies for midscale output of the DAC. For DC

PSRR, it is measured in mV/V and VDD is varied by ±10%. While

for AC PSRR, it is measured in dB and a ±200mV p-p AC sweep

signal is injected on VDD.

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 given step

change.

Digital-to-Analog Glitch Impulse

Digital-to-analog glitch impulse is the impulse injected into the

analog output when the input code in the DAC register changes

state. It is normally specified as the area of the glitch in nV × sec

and is measured when the digital input code is changed by 1 LSB.

Digital Feedthrough

Digital feedthrough is a measure of the impulse injected into the

analog output of the DAC from the digital inputs of the DAC, but it is

measured when the DAC output is not updated. Digital feedthrough

is specified in nV × sec and measured with a full-scale code change

on the data bus, which means from all 0s to all 1s and vice versa.

Output Noise Spectral Density

Noise spectral density is a measurement of the internally generated

random noise. Noise is measured at the DAC output when it is

loaded with the midscale code and center frequency set to 10kHz. It

is measured in nV/

Hz.

Total Harmonic Distortion (THD)

THD is the difference between an ideal sine wave and the attenuat-

ed version using the DAC. The sine wave is used as the reference

for the DAC, and the THD is a measurement of the harmonics

present on the DAC output. It is measured in dB.

Voltage Reference Temperature Coefficient

(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 shown in the following equation:

TC= VREF_MAX−VREF_MIN

VREF_NOM×TEMP_RANGE

×106

(1)

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, 2.5V.

TEMP_RANGE is the specified temperature range, −40°C to

+125°C.

DC Crosstalk

DC crosstalk is the DC change in the output level of one DAC in

response to a change in the output of another DAC. It is measured

with a full-scale output change on one DAC (or soft power-down

and power-up) while monitoring another DAC kept at midscale. It

is expressed in μV. DC crosstalk due to load current change is a

measure of the impact that a change in load current on one DAC

has to another DAC kept at midscale. It is expressed in μV/mA.

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