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