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MAX1450

Low-Cost, 1%-Accurate Signal Conditioner for Piezoresistive Sensors

Digitally Compensates Sensors to 1% Accuracy

Overview

Technical Documents

Ordering Info

Status

Not Recommended for New Designs

Description

The MAX1450 sensor signal conditioner is optimized for piezoresistive sensor calibration and temperature compensation. It includes an adjustable current source for sensor excitation and a 3-bit programmable-gain amplifier (PGA). Achieving a total typical error factor within 1% of the sensor's inherent repeatability errors, the MAX1450 compensates offset, full-span output (FSO), offset tempco, FSO tempco, and FSO nonlinearity of silicon piezoresistive sensors via external trimmable resistors, potentiometers, or digital-to-analog converters (DACs).

The MAX1450 is capable of compensating sensors that display close error distributions with a single temperature point, making it ideal for low-cost, medium-accuracy applications. Although optimized for use with popular piezoresistive sensors, it may also be used with other resistive sensor types such as strain gauges.

Data Sheet

Download	Rev 1	(PDF, 552kB)
E-Mail

An evaluation kit is available: MAX1450EVKIT

Key Features

1% Sensor Signal Conditioning
Corrects Sensor Errors Using Coefficients Stored in External Trimmable Resistors, Potentiometers, or DACs
Compensates Offset, Offset TC, FSO, FSO TC, and FSO Linearity
Rail-to-Rail Analog Output
Programmable Current Source for Sensor Excitation
Fast Signal-Path Settling Time (< 1ms)
Accepts Sensor Outputs from 10mV/V to 30mV/V
Fully Analog Signal Path
Contains PGA, current source

Applications/Uses

Automotive Electronics
Hydraulic Systems
Manifold Absolute Pressure (MAP) Sensors
Piezoresistive Pressure and Acceleration Transducers and Transmitters

Key Specifications:

Sensor Signal Conditioners

Part Number

Sensing Element

PGA Gain

Calibration Method

Accuracy
(%FSO)

Output Type

I_CC
(mA)

I_BRIDGE
(mA)

V_SUPPLY
(V)

max

typ

MAX1450

PRT

Resistive Bridge

Strain Gauge

39 to 221 (8 gains)

External trimmable resistor

Analog

2.8

0.1 to 2.0

4.5 to 5.5

See All Sensor Signal Conditioners (10)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Functional Diagram

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-1365 Rev 1; 2005-09-08
This page last modified: 2009-11-05