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Design Notes

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  Measuring 18 2-Wire RTDs with the LTC2983 &mdash DN1035
  PDF, 242 Кб, Файл опубликован: 30 окт 2015
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  Measuring 18 2-Wire RTDs with the LTC2983
  Design Note 1035
  Tom Domanski
  Introduction
  A single LTC В®2983 temperature measurement device
  can support up to 18 2-wire RTD probes, as shown
  in Figure 1. Each RTD measurement involves simultaneous sensing of two voltages developed across
  RSENSE and the RTD probe RTDx due to the current
  IS. Each voltage is sensed differentially, and given
  the LTC2983’s high common mode rejection ratio,
  the number of RTDs in the stack does not adversely
  affect the individual measurements.
  The choice of the RTD probe depends on the system
  accuracy and sensitivity requirements. For example,
  given that 2-wire probes are used, the PT-1000 may
  prove more robust in the presence of wiring’s parasitic resistance.
  Once the RTDs are selected, IS and RSENSE should be
  chosen so that voltage at the top of the resistor stack (V at the CH1 input) does not exceed the input common mode limit of the LTC2983 over the operating
  temperature range of the system. This requirement
  is expressed as:
  N
  вЋ›пЈ«
  вЋћпЈ¶ …

Статьи

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  Measuring 18 2-Wire RTDs with the LTC2983 High Accuracy Digital Temperature Measurement System &mdash LT Journal
  PDF, 171 Кб, Файл опубликован: 11 авг 2016
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  Measuring 18 2-Wire RTDs with the LTC2983 High Accuracy
  Digital Temperature Measurement System
  Tom Domanski The LTC2983 measures a wide variety of temperature
  sensors and digitally outputs the result, in В°C or В°F, with
  0.1В°C accuracy and 0.001В°C resolution. It can measure
  the temperature of virtually all standard (type B, E, J,
  K, N, S, R, T) or custom thermocouples, automatically
  compensate for cold junction temperatures and linearize
  the results. The device can also measure temperature with
  standard 2-, 3-, or 4-wire RTDs, thermistors and diodes.
  A single LTC2983 temperature measurement device can support up to 18 2-wire
  RTD probes, as shown in Figure 1. Each
  RTD measurement involves simultaneous
  sensing of two voltages developed across
  RSENSE and the RTD probe RTDx due to
  the current IS . Each voltage is sensed
  differentially, and given the LTC2983’s high
  common mode rejection ratio, the number
  of RTDs in the stack does not adversely
  affect the individual measurements.
  The choice of the RTD probe depends
  on the system accuracy and sensitivity
  requirements. For example, given that …

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  Robust Industrial Sensing with the Temperature-to-Bits Family &mdash LT Journal
  PDF, 1.0 Мб, Файл опубликован: 19 апр 2017
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  April 2017 I N T H I S I S S U E choose cool running, high
  power POL regulators and
  save board space 10 Volume 27 Number 1 Robust Industrial Sensing with the
  Temperature-to-Bits Family
  Logan Cummings accurate temperature
  measurements using
  devices with different
  ideality factors 18 battery charger features
  MPPT for solar panels 22 MOSFET safe operating
  area and hot swap circuits
  27 Precision temperature measurements provide important data points
  for industrial control systems to maximize efficiency, safety and
  reliability. Of course, industrial environments are challenging for
  performing precision measurements. High voltages, large sources
  of EMI and long cable runs between sensor and measurement
  device all conspire to deter accuracy. This article shows how to
  overcome these barriers, and improve the noise immunity and
  overvoltage tolerance of the LTCВ®2983, LTC2984 and LTC2986
  temp-to-bits devices, without degrading measurement accuracy.
  With up to 20 input channels, the temp-to-bits
  family is well suited for industrial temperature
  monitoring. Multiple sensors can be used to evaluate
  temperature gradients and identify anomalous …

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  Temperature-to-Bits: One IC for All Sensor Types, 0.1°C Conformity &mdash LT Journal
  PDF, 494 Кб, Файл опубликован: 22 янв 2015
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  January 2015 I N T H I S I S S U E Mike Engelhardt shows
  how LTspiceВ® is head of the
  SPICE pack 10 clocking solutions: 1.4GHz
  low jitter PLL with clock
  distribution 17 1.5A monolithic buck-boost
  DC/DC, 2.5V–15V VIN and
  VOUT 24 DC/DC for hundreds of
  watts, 60V VIN or VOUT 28 analysis of Hot Swapв„ў
  circuits with foldback
  current limit 34 Volume 24 Number 4 Temperature-to-Bits: One IC for All
  Sensor Types, 0.1В°C Conformity
  Michael Mayes Temperature measurement is not new. Galileo invented a
  rudimentary thermometer capable of detecting temperature
  changes, and two hundred years later, Seebeck discovered the
  thermocouple. Given the long history of temperature measurement
  and its extensive use today, one would think that accuracy
  problems were all but eliminated. Not so. Even though methods
  for extracting temperature from sensor elements are well known,
  accurately measuring temperatures to better than 0.5В°C or
  В®
  0.1В°C accuracy remains a challenge. The LTC 2983 enables up
  to 0.1В°C temperature conformity (measured accuracy against
  a precision temperature calibrator), as shown in Figure 1. …

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Классификация производителя

• Monitor, Control and Protection > Temperature Monitors > Digital Temperature Measurement Systems