Can any one give me the information that in that following circuit why we are using Resistor "R5" And "R6" Is it pullup /Pulldown resistor or something else.
Thanks And BR
Hello Sanjeev,Those resistors are used to limit the current through the Wheatstone bridge, set the common-mode voltage to 2.5V (when RTD=100ohms), and limit the differential input voltage. Please see the attached TINA-TI schematic and simulations for further understanding. You will notice the INA114 will saturate quickly without R5 and R6.
Another note is that with dual supplies (+/-15V) the INA114 can output +/-13.7V (typical). The ADS7870 is a 5V ADC. Be sure to protect the input of the ADC if this is the desired solution. An alternate option would be to consider our ADS1147.
Precision Analog Applications
Thanks Pete for the suggestion i will go through, i think this is useful for me.
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