GENERAL DESCRIPTION
The AD7843 is a 12-bit successive-approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screens. The part operates from a single 2.2 V to 5.25 V power supply and features throughput rates greater than 125 kSPS.

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 μA max
   16-Lead QSOP and TSSOP Packages

APPLICATIONS
   Personal Digital Assistants
   Smart Hand-Held Devices
   Touch Screen Monitors
   Point-of-Sales Terminals
   Pagers