Description:The Intersil HI7191 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 auto-calibrate function is capable of removing offset and gain errors existing in external and internal circuitry. The on-boar
A good PCB layout for the HI7191IBZ involves separating analog and digital grounds, using a solid ground plane, and placing decoupling capacitors close to the device. Additionally, keeping the analog and digital signal traces separate and avoiding crossing them can help minimize noise.
To ensure proper calibration, follow the calibration procedure outlined in the datasheet, which involves applying a known temperature to the device and adjusting the offset and gain registers accordingly. It's also important to perform calibration over the entire operating temperature range.
The recommended power-up sequence for the HI7191IBZ is to apply VCC first, followed by VLOGIC, and then the analog input voltage. This sequence helps prevent damage to the device and ensures proper operation.
To handle the HI7191IBZ's output data, use a 16-bit signed integer to store the temperature data, and apply the correct scaling factor to convert the output code to a temperature value in Celsius or Fahrenheit. Additionally, consider using a digital filter to reduce noise and improve accuracy.
When designing a system with the HI7191IBZ, consider the thermal resistance of the device, the thermal interface material, and the heat sink design. Ensure good thermal contact between the device and the heat sink, and consider using thermal simulation tools to optimize the design.
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HI7191IBZ Overview
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