AD5675R datasheet(18/28 Pages) AD

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Data Sheet

AD5676

Rev. B | Page 17 of 27

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)

DNL is the difference between the measured change and the

ideal 1 LSB change between any two adjacent codes. A specified

DNL of ±1 LSB maximum ensures monotonicity. The AD5676

is 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. Ideally, the 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. Ideally, the

output should be VDD − 1 LSB. 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)

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

the 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

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 and is measured from the rising edge of SYNC.

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)

NSD 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 to

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. To

measure analog crosstalk, load 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. It is measured by

loading the attack channel with a full-scale code change (all 0s

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

commands while monitoring the output of the victim channel

that is at midscale. The energy of the glitch is expressed in nV-sec.

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