Single 5V supply AD826 Hot and not working close to zero

Dear Sir,

We are using AD826 as buffer before an ADC. 5V DC single supply. Gain is 1.

When input is close to zero or zero (not negative however) we experience inconsistency on the output and AD826 is heating. Seems to work as we increase input voltage for example to 1V.

Is there any limitation using the input close to 0V on this opamp with 0/5V DC supply ? Checking the datasheet, I was not able to locate any information on the datasheet.

Best regards

Parents
  • The AD826 is not rail to rail input.  On ground and 5V, you have to keep the inputs between +1.2V and  3..8V

    Also, for duals, you have to correctly tie off the unused section.  Hook it up as a follower and put the non-inverting

    input on 2.5V.

    "Checking the datasheet, I was not able to locate any information on the datasheet."  See input voltage range.

    Harry

Reply
  • The AD826 is not rail to rail input.  On ground and 5V, you have to keep the inputs between +1.2V and  3..8V

    Also, for duals, you have to correctly tie off the unused section.  Hook it up as a follower and put the non-inverting

    input on 2.5V.

    "Checking the datasheet, I was not able to locate any information on the datasheet."  See input voltage range.

    Harry

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