EVAL-AD7879EBZ datasheet(11/36 Pages) AD

Part #	EVAL-AD7879EBZ

Description	Low Voltage Controller for Touch Screens

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AD7879

Rev. 0 | Page 11 of 36

TERMINOLOGY

Integral Nonlinearity (INL)

INL is the maximum deviation from a straight line passing

through the endpoints of the ADC transfer function. The end-

points of the transfer function are zero scale at 1 LSB below the

first code transition and full scale at 1 LSB above the last code

transition.

Differential Nonlinearity (DNL)

DNL is the difference between the measured and the ideal

1 LSB change between any two adjacent codes in the ADC.

Offset Error

Offset error is the deviation of the first code transition

(00 … 000) to (00 … 001) from the ideal (AGND + 1 LSB).

Gain Error

Gain error is the deviation of the last code transition

(111 … 110) to (111 … 111) from the ideal (VREF − 1 LSB)

after the offset error has been adjusted out.

On Resistance

On resistance is a measure of the ohmic resistance between the

drain and the source of the switch drivers.

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