AD7843ARQ View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD7843ARQ

Touch Screen Digitizer

Analog Devices 

TERMINOLOGY

Integral Nonlinearity

This is the maximum deviation from a straight line passing

through the endpoints of the ADC transfer function. The

endpoints of the transfer function are zero scale, a point 1 LSB

below the first code transition, and full scale, a point 1 LSB

above the last code transition.

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 (00…000) to

(00…001) from the ideal, that is, AGND + 1 LSB.

Gain Error

This 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.

AD7843

Track-and-Hold Acquisition Time

The track-and-hold amplifier enters the acquisition phase on

the fifth falling edge of DCLK after the START bit has been

detected. Three DCLK cycles are allowed for the track-and-hold

acquisition time. The input signal is fully acquired to the 12-bit

level within this time even with the maximum specified DCLK

frequency. See the Analog Input section for more details.

On Resistance

This is a measure of the ohmic resistance between the drain and

source of the switch drivers.

Rev. B | Page 7 of 20

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