AN4022| Application Note
Maxim > App Notes > SENSOR SIGNAL CONDITIONERS Keywords: MAX1452, Sensor, Signal Conditioner, Low cost, Precision, Pressure sensor, PRT, Thermocouple, RTD, Thick Film, Thin Film, Strain gauge, Signal conditioning
Mar 01, 2007
APPLICATION NOTE 4022
MAX1452 Nonlinearity-Correction Application Circuit
Abstract: The MAX1452 is a high-performance analog signal conditioner that has been widely accepted and is used in a variety of industrial and automotive applications. Sensor-output nonlinearity correction is a critical requirement in some applications. Although nonlinearity correction has not been implemented in the MAX1452, it can be achieved simply by using an additional three resistors in the application circuit. This application note presents such a circuit and provides data that supports its effectiveness.
Introduction
In sensor applications that have nonlinear outputs (such as humidity sensors), it is important that the signal conditioner be able to correct the nonlinearity of the sensor output. This application note describes how to use the MAX1452--a popular low-cost, high-performance signal conditioner with on-chip flash memory, an on-chip temperature sensor, and a fully analog signal path--to correct the nonlinearity of a sensor output. Although a nonlinearity-correction function has not been implemented in the MAX1452, it can be achieved by a very simple external circuit that utilizes three additional resistors in the application circuit. Please note that this approach is only possible using the MAX1452 in bridge-voltage-drive mode and cannot be implemented in the MAX1455, since bridge-drive mode is not possible in the MAX1455.
Figure 1. Basic nonlinearity-correction circuit.
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