AD7416ARMZ datasheet(10/24 Pages) AD

10 / 24 page

AD7416/AD7417/AD7418

Rev. I | Page 10 of 24

TERMINOLOGY

Relative Accuracy

Relative accuracy or endpoint nonlinearity is the maximum

deviation from a straight line passing through the endpoints of

the ADC transfer function.

Differential Nonlinearity

This is the difference between the measured and the ideal 1 LSB

change between any two adjacent codes in the ADC.

Offset Error

This is the deviation of the first code transition (0000…000) to

(0000…001) from the ideal, that is, GND + 1 LSB.

Offset Error Match

This is the difference in offset error between any two channels.

Gain Error

This is the deviation of the last code transition (1111…110) to

(1111…111) from the ideal, that is, VREF − 1 LSB, after the

offset error has been adjusted out.

Gain Error Match

This is the difference in gain error between any two channels.

Track-and-Hold Acquisition Time

Track-and-hold acquisition time is the time required for the

output of the track-and-hold amplifier to reach its final value,

within ±½ LSB, after the end of conversion (the point at which

the track-and-hold returns to track mode). It also applies to

situations where a change in the selected input channel takes

place or where there is a step input change on the input voltage

applied to the selected AIN input of the AD7417 or AD7418. It

means that the user must wait for the duration of the track-and-

hold acquisition time after the end of conversion, or after a

channel change or step input change to AIN before starting

another conversion, to ensure that the part operates to

specification.

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