The thermocouple AD switch circuit

Published:2011/6/3 1:06:00 Author:Seven | Keyword: thermocouple, AD switch circuit | From:SeekIC

Figure 1-7 the thermocouple temperature control circuitThis is a temperature control circuit of 5V single power supply and 12 bit cold pole compensation, which has the functions of shutting-off. The supervision is done by a J thermocouple. LT1025A is a compensation circuit of the thermocouple cold pole, LTC1050 is the wave-cutting computing amplifier which is used to magnify the signals. The RC net of 47KΩ and 1μF can filter noises when the signal is coming in to the A/D converter. LT1297 is the A/D converter, LTC1257 is the reference power supply, and the output of LTC1257 is the temperature control signal in system supervision.



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