Temperature Measurement via Thermocouple (OPA335)

2016-01-26 16:03  
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This article describes the Temperature Measurement via Thermocouple (OPA335). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:OPA335.

This is a temperature measurement circuit using thermocouple. This is a low-frequency application. It will allow the OPA335 to be switched directly into the signal path. This circuit has low noise, high accuracy, and low drift. Here is the circuit :

Temperature Measurement via Thermocouple circuit schematic diagram

The 4.096-V bridge supply is provided by a precision voltage reference. A negative temperature coefficient of? diode D1′s forward voltage is -2 mV/oC. It also provides cold junction compensation via the resistor network R1 to R3. R6 is used to obtain the zero adjustment for a defined minimum temperature. The gain for the output amplifier is set by R8 and R7.

This circuit has 16-bit or better accuracy at high gain in low-voltage applications because the single-supply amplifier provide an open loop gain of 130dB. This circuit has an auto zeroing, that is used to provide typical values of 1 μV of input offset and 20 nV/oC of offset drift over temperature and? remove 1/f noise.


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