Microprocessor-Compatible, 5-1/2 Digit A/D Converter

The Intersil HI-7159A is a monolithic A/D converter that uses a unique dual slope technique which allows it to resolve input changes as small as 1 part in 200,000 (10µV) without the use of critical external components. Its digital autozeroing feature virtually eliminates zero drift over temperature. The device is fabricated in Intersil’ proprietary low noise BiMOS process, resulting in exceptional linearity and noise performance.

Features

• ±200,000 Count A/D Converter

• 2V Full Scale Reading With 10µV Resolution

• 15 Conversions Per Second in 51/2 Digit Mode

• 60 Conversions Per Second in 41/2 Digit Mode

• Serial or Parallel Interface Modes

• Four Selectable Baud Rates

• Differential Analog Input

• Differential Reference Input

• Digital Autozero

Applications

• Weigh Scales

• Part Counting Scales

• Laboratory Instruments

• Process Control/Monitoring

• Energy Management

• Seismic Monitoring