ADT7516 datasheet(17/44 Pages) AD

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ADT7516/ADT7517/ADT7519

Rev. B | Page 17 of 44

TERMINOLOGY

Relative Accuracy

Relative accuracy or integral nonlinearity (INL) is a measure of

the maximum deviation, in LSBs, from a straight line passing

through the endpoints of the transfer function. Typical INL vs.

code plots are shown in Figure 8, Figure 9, and Figure 10.

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 ±0.9 LSB maximum

ensures monotonicity. Typical DAC DNL vs. code plots can be

seen in Figure 11, Figure 12, and Figure 13.

Total Unadjusted Error (TUE)

Total unadjusted error is a comprehensive specification that

includes the sum of the relative accuracy error, gain error, and

offset error under a specified set of conditions.

Offset Error

Offset error is a measure of the offset error of the DAC and the

output amplifier (see Figure 40 and Figure 41). It can be

negative or positive, and it is expressed in mV.

Offset Error Match

Offset error match is the difference in offset error between any

two channels.

Gain Error

Gain error is a measure of the span error of the DAC. It is the

deviation in slope of the actual DAC transfer characteristic from

the ideal expressed as a percentage of the full-scale range.

Gain Error Match

Gain error match is the difference in gain error between any

two channels.

Offset Error Drift

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

with changes in temperature. It is expressed in ppm of

full-scale range/°C.

Gain Error Drift

Gain error drift is a measure of the change in gain error

with changes in temperature. It is expressed in ppm of

full-scale range/°C.

Long-Term Temperature Drift

Long-term temperature drift is a measure of the change in

temperature error with the passage of time. It is expressed in °C.

The concept of long-term stability has been used for many years

to describe the amount an IC parameter shifts during its

lifetime. This is a concept that has typically been applied to both

voltage references and monolithic temperature sensors.

Unfortunately, integrated circuits cannot be evaluated at room

temperature (25°C) for 10 years or so to determine this shift.

Manufacturers perform accelerated lifetime testing of integrated

circuits by operating ICs at elevated temperatures (between

125°C and 150°C) over a shorter period (typically between

500 hours and 1000 hours). As a result, the lifetime of an

integrated circuit is significantly accelerated due to the increase

in rates of reaction within the semiconductor material.

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 a change in VDD for full-scale output of the DAC. It is

measured in dB. VREF is held at 2 V and VDD is varied ±10%.

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 while

monitoring another DAC. It is expressed in μV.

Reference Feedthrough

Reference feedthrough is the ratio of the amplitude of the signal

at the DAC output to the reference input when the DAC output

is not being updated (that is, LDAC is high). It is expressed in dB.

Channel-to-Channel Isolation

Channel-to-channel isolation is the ratio of the amplitude of the

signal at the output of one DAC to a sine wave on the reference

input of another DAC. It is measured in dB.

Major Code Transition Glitch Energy

Major code transition glitch energy is the energy of the impulse

injected into the analog output when the code in the DAC

glitch in nV-s and is measured when the digital code is changed

by 1 LSB at the major carry transition (011 . . . 11 to 100 . . . 00

or 100 . . . 00 to 011 . . . 11).

Digital Feedthrough

Digital feedthrough is a measure of the impulse injected into

the analog output of a DAC from the digital input pins of the

device. However, it is measured when the DAC is not being

written to. It is specified in nV-s and is measured with a full-

scale change on the digital input pins, that is, from all 0s to all

1s or vice versa.

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-s.

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