The Intersil HI7190 is a monolithic instrumentation, sigma delta A/D converter which operates from ±5V supplies. Both the signal and reference inputs are fully differential for maximum flexibility and performance. An internal Programmable Gain Instrumentation Amplifier (PGIA) provides input gains from 1 to 128 eliminating the need for external pre-amplifiers. The on-demand converter autocalibrate function is capable of removing offset and gain errors existing in external and internal circuitry. The on-board user programmable digital filter provides over 120dB of 60/50Hz noise rejection and allows fine tuning of resolution and conversion speed over a wide dynamic range. The HI7190 and HI7191 are functionally the same device, but the HI7190 has tighter linearity specifications.

Features

• 22-Bit Resolution with No Missing Code

• 0.0007 Integral Non-Linearity (Typ)

• 20mV to ±2.5V Full Scale Input Ranges

• Internal PGIA with Gains of 1 to 128

• Serial Data I/O Interface, SPI Compatible

• Differential Analog and Reference Inputs

• Internal or System Calibration

• 120dB Rejection of 60/50Hz Line Noise

• Settling Time of 4 Conversions (Max) for a Step Input

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• Process Control and Measurement

• Industrial Weight Scales

• Part Counting Scales

• Laboratory Instrumentation

• Seismic Monitoring

• Magnetic Field Monitoring

• Additional Reference Literature

- Technical Brief, TB348 “HI7190/1 Negative Full Scale Error vs Conversion Frequency”

- Application Note, AN9504 “A Brief Intro to Sigma Delta Conversion”

- Technical Brief, TB329 “Intersil Sigma Delta Calibration Technique”

- Application Note, AN9505 “Using the HI7190 Evaluation Kit”

- Technical Brief, TB331 “Using the HI7190 Serial Interface”

- Application Note, AN9527 “Interfacing HI7190 to a Microcontroller”

- Application Note, AN9532 “Using HI7190 in a Multiplexed System”

- Application Note, AN9601 “Using HI7190 with a Single +5V Supply”