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07-12-2011

Temperature-to-Voltage Converter Measures Remote Diodes with 1°C Accuracy

Linear Technology » LTC2997

Linear Technology introduced a high accuracy temperature-to-voltage converter with built-in series resistance cancellation for 2.5 V to 5.5 V systems. Many low voltage systems today rely on temperature to assess overall system health and reliability. Traditional implementations require a series of filters, a precise reference and a current source, resulting in a complex conversion scheme prone to inaccuracies if not carefully designed.

Linear Technology - LTC2997

The LTC2997 is a simple temperature monitoring solution that measures a remote diode's temperature with ±1°C accuracy or local temperature with ±1.5°C accuracy, and outputs a voltage proportional to absolute temperature. The LTC2997 provides a precise, space-saving, micropower temperature monitoring solution.

The LTC2997's simplicity, accuracy and micropower consumption caters to a wide variety of applications, including system thermal control, energy harvesting, desktop and notebook computers, network servers and environmental monitoring. Two current sense inputs can be configured to measure either local or remote temperature. A built-in algorithm cancels the errors due to sensor series resistance when measuring a diode or transistor voltages. A 1.8 V voltage reference output is also available to share with an external ADC or for generating temperature threshold voltages to compare against the VPTAT output.

The LTC2997 is offered in commercial, industrial and automotive versions, supporting operating temperature ranges from 0 to 70 °C, -40 to 85 °C and -40 to 125 °C, respectively. The LTC2997 is available today in a small RoHS compliant, 6-pin, 2 mm x 3 mm DFN package. Pricing starts at $1.45 each in 1,000 piece quantities.

Features

  • Converts Remote Sensor or Internal Diode
  • Temperature to Analog Voltage
  • ±1°C Remote Temperature Accuracy
  • ±1.5°C Internal Temperature Accuracy
  • Built-In Series Resistance Cancellation
  • 2.5V to 5.5V Supply Voltage
  • 1.8V Reference Voltage Output
  • 3.5ms VPTAT Update Time
  • 4mV/°C Output Gain
  • 170μA Quiescent Current
  • Available in 6-Pin 2mm × 3mm DFN Package

Applications

  • Temperature Measurement
  • Remote Temperature Measurement
  • Environmental Monitoring
  • System Thermal Control
  • Desktop and Notebook Computers
  • Network Servers

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