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Tool/software: Code Composer Studio
Dear TI officer and members,
Currently, I am using the CC2541 to collect an analog signal.
The amplifier of OPA4140 was adapted as shown in the listed figure.
Here is the problem that the OPA4140 is every hot (close to 80 C in the ambient environment of 25 C) due to the large input current of 120 mA, which is overcurrent.
This is impossible under the normal condition. I can not find the reason. Please help me.
The positive and negative voltages are provided by TPS65133 dual-output supply.
Best regards,
Derrick
Dear Green,
Thanks so much for your information. I built the model in TINA-TI. But the ERC always told me the invalid device. Can you help me resolve this problem? thank so much.
Best regards,
Derrick
Dear Green,
Thanks so much for your help. You are right. The noise is very large due to the MEG resistor. In order to reduce the noise, how many value resistance you recommend?
This circuit is used to be a sensor for input voltage range from -0.2- +0.2 V.
Many thanks!