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-bit or 12-bit resolution
   2 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