Datasheet Summary
a
Features
4-Wire Touch Screen Interface Specified Throughput Rate of 125 kSPS Low Power Consumption: 1.37 mW Max at 125 kSPS with VCC = 3.6 V Single Supply, VCC of 2.2 V to 5.25 V Ratiometric Conversion High-Speed Serial Interface Programmable 8- or 12-Bit Resolution Two Auxiliary Analog Inputs Shutdown Mode: 1 A max 16-Lead QSOP and TSSOP Packages APPLICATIONS Personal Digital Assistants Smart Hand-Held Devices Touch Screen Monitors Point-of-Sales Terminals Pagers
X+ X- Y+ Y-
Touch Screen Digitizer AD7843
FUNCTIONAL BLOCK DIAGRAM
+VCC PENIRQ
PEN INTERRUPT
T/H 4-TO-1 I/P MUX
IN3 IN4 VREF CHARGE REDISTRIBUTION DAC
+VCC SAR + ADC CONTROL LOGIC
SPORT
GENERAL...