AD5671R datasheet(21/31 Pages) AD

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Data Sheet

AD5673R/AD5677R

Rev. 0 | Page 21 of 31

TERMINOLOGY

Relative Accuracy or Integral Nonlinearity (INL)

For the DAC, relative accuracy or integral nonlinearity is a

measurement 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. A specified differential nonlinearity of ±1 LSB maximum

ensures monotonicity. These DACs are guaranteed monotonic

by design.

Zero Code Error

Zero code error is a measurement of the output error when zero

code (0x0000) is loaded to the DAC register. The ideal output is

0 V. The zero code error is always positive because the output of

the DAC cannot go below 0 V due to a combination of the offset

errors in the DAC and the output amplifier. Zero code error is

expressed in mV.

Full-Scale Error

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

scale code (0xFFFF) is loaded to the DAC register. The ideal

output is VREF − 1 LSB (gain = 1) or 2 × VREF (gain = 2). Full-

scale error is expressed in percent of full-scale range (% of FSR).

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 as % of FSR.

Offset Error Drift

Offset error drift is a measurement of the change in offset error

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

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 register. It can be negative or positive.

DC Power Supply Rejection Ratio (PSRR)

The dc power supply rejection ratio indicates how the output of

the DAC is affected by changes in the supply voltage. PSRR is

the ratio of the change in VOUTx to a change in VDD for full-scale

output of the DAC. It is measured in mV/V. VREF is held at 2 V,

and VDD is varied by ±10%.

Output Voltage Settling Time

The 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 ¼ to ¾

full-scale input 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 at the major carry transition (0x7FFF to 0x8000).

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 is measured when the DAC output is not updated. It is

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

on the data bus, that is, from all 0s to all 1s and vice versa.

Noise Spectral Density (NSD)

Noise spectral density is a measurement of the internally

generated random noise. Random noise is characterized as a

spectral density (nV/√Hz). It is measured by loading the DAC

to midscale and measuring noise at the output. It is measured in

nV/√Hz.

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 on

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

Digital Crosstalk

Digital crosstalk is the glitch impulse transferred to the output

of one DAC at midscale in response to a full-scale code change

(all 0s to all 1s and vice versa) in the input register of another

DAC. It is measured in standalone mode and is expressed in

nV-sec.

Analog Crosstalk

Analog crosstalk is the glitch impulse transferred to the output

of one DAC due to a change in the output of another DAC. It is

measured by first loading one of the input registers with a full-

scale code change (all 0s to all 1s and vice versa). Then, execute

a software LDAC and monitor the output of the DAC whose

digital code was not changed. The area of the glitch is expressed

in nV-sec.

DAC to DAC Crosstalk

DAC to DAC crosstalk is the glitch impulse transferred to the

output of one DAC due to a digital code change and subsequent

analog output change of another DAC. DAC to DAC crosstalk is

measured with a full-scale change on one DAC output (all 0s to

all 1s and vice versa), using the write to and update commands,

while monitoring the other DAC output kept at midscale. The

energy of the glitch is expressed in nV-sec.

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