Description

The HI7188 is an easy-to-use 8-Channel sigma-delta programmable A/D subsystem ideal for low frequency physical and electrical measurements in scientific, medical, and industrial applications. The subsystem has complete on-chip capabilities to support moving the intelligence from the system controller and towards the sensors. This gives the designer faster and more flexible configurability without the traditional drawbacks of low throughput per channel, higher power or cost per channel. Extreme design complexity and excessive software overhead is eliminated.

Features

• Fully Differential 8-Channel Multiplexer and Reference

• Automatic Channel Switching with Zero Latency

• 240 Conversions Per Second Per Channel

• 16-Bit Resolution with No Missing Codes

• 0.0015 Integral Non-Linearity

• Fully Software Configurable

- -120dB Rejection of 60/50Hz Line Noise

- Channel Conversion Order and Number of Active Channels

- True Bipolar or Unipolar Input Range Per Channel

- PGIA Gain Per Channel

- 2-Wire or 3-Wire Interface

• Chopper Stabilized PGIA with Gains of 1 to 8

• Serial Data I/O Interface, SPI Compatible

• 3 Point System Calibration

• Low Power Dissipation of 30mW (Typ)

Applications

• Multi-Channel Industrial Process Controls

• Weight Scales

• Medical Patient Monitoring

• Laboratory Instrumentation

• Gas Monitoring System

• Reference Literature

- AN9504 “A Brief Introduction to Sigma Delta Conversion”

- TB329 “Intersil Sigma-Delta Calibration Techniques”

- AN9518 “Using the HI7188 Evaluation Kit”

- AN9610 “Interfacing the HI7188 to a Microcontroller”

- AN9538 “Using the HI7188 Serial Interface”