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  Ultraprecise Instrumentation Amplifier Makes Robust Thermocouple Interface &mdash DN302
  PDF, 73 Kb, 档案已发布: Jan 1, 2003
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  Ultraprecise Instrumentation Amplifier Makes
  Robust Thermocouple Interface – Design Note 302
  Jon Munson
  Introduction
  The versatile and precise LTC В®2053 instrumentation
  amplifier provides an excellent platform for robust, low
  power instrumentation products—as exemplified below
  by the battery-powered thermocouple amplifier circuit.
  The LTC2053 offers exceptionally low 10ОјV maximum
  input offset along with 116dB typical CMRR and PSRR,
  a result of a combination of switched capacitor and zerodrift op amp technologies. It is optimized for low voltage
  supplies from 2.7V to 11V single ended or up to В±5.5V with
  split supplies. The LTC2053 is ideal for battery-powered
  instrument applications because of its low 850ОјA typical
  current draw. The gain is easily programmed with two
  resistors, as shown in Figure 1, just like a traditional
  non-inverting op amp. The LTC2053 also features low
  1/f noise and rail-to-rail I/O to maximize dynamic range.
  The Requirements of Thermocouple Amplification
  A robust thermocouple amplification circuit must meet
  several specific requirements. First, a commonly used
  type K thermocouple develops 40.6ОјV/В°C, and a standard
  readout scale is 10mV/В°C, so a precision ampliп¬Ѓer with …

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• Signal Conditioning > Thermocouple Compensators