Dual-Channel, Platinum, RTD-to-Voltage Signal Conditioner

Replaces Expensive, Discrete Solutions while Reducing Board Space by Offering Complete Automotive Fault Protection Against ESD (±8kV Rated) and Short-to-Battery Fault, Plus Sensitive Microcontroller Inputs Protection
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This product is Not Recommended for New Designs. Some versions may be No Longer Available or being discontinued and subject to Last Time Buy, after which new orders can not be placed. See Ordering Information for details.


The MAX6603 dual-channel, platinum RTD-to-voltage signal conditioner excites and amplifies the signal from two external 200Ω platinum-resistive temperature devices (Pt RTD) to achieve high-voltage, level-filtered signals for temperature measurements. The MAX6603 provides a direct ratiometric output voltage to simplify the interface to microcontrollers with integrated analog-to-digital converters (ADCs). External precision resistors and calibration processes are not needed. The MAX6603 provides the necessary signal-conditioning functions, including ratiometric excitation current, amplification, buffered voltage outputs, diagnostic fault detections, and input protection. The MAX6603 amplifies signals from two RTDs operating over the -40°C to +1000°C temperature range and provides the temperature information as two independent analog voltages. The MAX6603 features a ±6°C (max) accuracy over the +400°C to +600°C temperature range.

The MAX6603 has overvoltage protection up to +16V on RTD inputs, and ±5kV electrostatic discharge (ESD) protection at RTD input pins for reliable operation where RTD temperature-sensing probes are used. The MAX6603 monitors the RTD for faults and asserts the respective active-low DG output low for fault conditions. The analog voltage outputs can be readily connected to a variety of microcontrollers.

The MAX6603 is available in a small, 10-pin TDFN-EP package and operates over the -40°C to +125°C automotive temperature range from a single +3V to +5.5V power supply.

Data Sheet

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Key Features

  • Amplifies Pt RTD Temperature Signals
  • ±5kV ESD Protection on RTD Inputs
  • +16V Overvoltage Fault Protection on RTD Inputs
  • Low RTD Excitation Current Minimizes Self-Heating Errors
  • Small, 10-Pin TDFN Package
  • Fully Ratiometric Operation
  • No Calibration Required for Standard RTDs
  • RTD Diagnostic Check
  • High Accuracy: ±6°C (max) from +400°C to +600°C


  • Automotive
  • Automotive Exhaust Temperature Monitoring
  • Automotive Sensors
  • Braking Systems
  • Engine Control Management to Meet EURO IV Regulations
  • Food Transportation Monitoring Systems
  • Industrial Process Measurements
  • Industrial Temperature Sensors


MAX6603: Typical Operating Circuit
Typical Operating Circuit

More Information

Topmark Coding MAX6603
New Product Press Release   2006-05-12 ]

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Document Ref.: 19-3975 Rev 0; 2006-05-02
This page last modified: 2007-08-17