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TLV7032: voltage reference

Brian Zoro
Expert 4020 points

Part Number: TLV7032

hi team,

Once of our customer is currently evaluation TLV7032DSGR.
Could you kindly have a quick look into below customer question(s) and help providing feedback?

I have some questions regarding the TLV7032DSGR, which could be a good option for one of our products:

  • For simplicity we want to use this comparator with a reference voltage of Vcc and a signal which moves around Vcc and therefore, can also be higher than Vcc.
  • According to the datasheet the recommended input voltage range goes up to Vcc+0.1V, but the absolute maximum rating goes up to 7V. Therefore, I assume the inputs are not diode-clamped to Vcc. Can you confirm that?
  • Anyway, the current through the inputs is also limited by external resistors to a maximum of a few µA.
  • I tested the circuit also with input voltages of up to Vcc+2V (before the current limiting resistor) and a reference of Vcc. The circuit worked without problems. Do you see any potential risk if we use the comparator this way?


Thanks!
Regards,
Brian

  • 0
    TI__Genius 11701 points

    Hi Brian,

    Yes that is correct, for TLV7032, the inputs are only diode-clamped to VEE, not VCC. This means that the inputs can go up to 7V without causing damage to the device. However, because you are operating outside the recommended operating conditions for the input voltage range (VEE - 0.V to VCC + 0.1V), then we cannot warranty the behavior and specs of the datasheet. It's possible you may see some issues in spec degradation when you're operating outside the range. With that said, since you are current limiting, and you are satisfied with the results and behavior, I don't expect to see any other problems or damages. 

    -Chi

  • 0
    Guru 140200 points

    Hi Brian,

    why not using simple voltage dividers and moving the input voltages into the specified common mode input voltage range of TLV7032? See section 6.3 of dahasteet.

    Kai

  • 0 in reply to kai klaas69
    TI__Genius 11701 points

    Thanks Kai for your input. 

    Brian, 

    I am going to close this post to reach out to you offline.