2.375V to 5.25V, 4-Wire Touch-Screen Controller

with Internal Reference and Temperature Sensor

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21

Differential Nonlinearity

Differential nonlinearity (DNL) is the difference between

an actual step width and the ideal value of 1LSB. A

DNL error specification of less than 1LSB guarantees

no missing codes and a monotonic transfer function.

Aperture Jitter

the time between the samples.

Aperture Delay

falling edge of the sampling clock and the instant when

an actual sample is taken.

Chip Information

TRANSISTOR COUNT: 12,000

PROCESS: 0.6µm BiCMOS

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

SERIAL/CONVERSION CLOCK

CHIP SELECT

SERIAL DATA IN

CONVERTER STATUS

SERIAL DATA OUT

PEN INTERRUPT

50kΩ

X+

Y+

X-

Y-

GND

BAT

AUX

VOLTAGE

REGULATOR

AUXILIARY

INPUT

TO BATTERY

TOUCH

SCREEN

2.375V TO 5.5V

1µF TO 10µF

OPTIONAL

0.1µF

0.1µF

MXB7846

DCLK

CS

DIN

PENIRQ

BUSY

DOUT

REF

Typical Application Circuit