Am I exceeding the maximum ratings?











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I'm using LMC6482 opamp with +/-15V rail voltages and having weird behavior. This means Vcc is +15V and Vee is -15V in my case.



Am I exceeding the specs? The jargon in the datasheet is not clear or should I say I'm not familiar with it.






op-amp power







share|improve this question
























  • You could do 15V and 0V, but that probably won't meet your needs.
    – StainlessSteelRat
    2 days ago















up vote
10
down vote

favorite












I'm using LMC6482 opamp with +/-15V rail voltages and having weird behavior. This means Vcc is +15V and Vee is -15V in my case.



Am I exceeding the specs? The jargon in the datasheet is not clear or should I say I'm not familiar with it.






op-amp power







share|improve this question
























  • You could do 15V and 0V, but that probably won't meet your needs.
    – StainlessSteelRat
    2 days ago













up vote
10
down vote

favorite









up vote
10
down vote

favorite











I'm using LMC6482 opamp with +/-15V rail voltages and having weird behavior. This means Vcc is +15V and Vee is -15V in my case.



Am I exceeding the specs? The jargon in the datasheet is not clear or should I say I'm not familiar with it.






op-amp power







share|improve this question















I'm using LMC6482 opamp with +/-15V rail voltages and having weird behavior. This means Vcc is +15V and Vee is -15V in my case.



Am I exceeding the specs? The jargon in the datasheet is not clear or should I say I'm not familiar with it.






op-amp power




op-amp power






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 2 days ago









Transistor

79k777172




79k777172










asked 2 days ago









user164567

663518




663518












  • You could do 15V and 0V, but that probably won't meet your needs.
    – StainlessSteelRat
    2 days ago


















  • You could do 15V and 0V, but that probably won't meet your needs.
    – StainlessSteelRat
    2 days ago
















You could do 15V and 0V, but that probably won't meet your needs.
– StainlessSteelRat
2 days ago




You could do 15V and 0V, but that probably won't meet your needs.
– StainlessSteelRat
2 days ago










4 Answers
4






active

oldest

votes

















up vote
22
down vote













Yes, you are exceeding the specs. Look at table 6.1 of the DATASHEET on page 3:



enter image description here



It clearly states the maximum difference between the V+ and V- pins is 16V. This means you can have +8V and -8V, as the difference is 16V.



As you have it right now, your difference is 30V, which is almost double the maximum ratings. Chances are, you have damaged the op-amp and it will need to be replaced. You should ALWAYS check the maximum ratings of any IC you are using if you are worried. If you can, try and be within the maximum, so +7.5V and -7.5V would work nicely here, for a total of 15V supply.






share|improve this answer



















  • 3




    OP did check the maximum ratings, but was confused. And it seems to be guaranteed to function well for a 15 volt supply, so ±7.5 would be nice.
    – pipe
    2 days ago






  • 8




    "The jargon in the datasheet is not clear" sounds to me like he actually read it but did not understand it.
    – pipe
    2 days ago






  • 4




    Also worth noting that the chip is designed for a nominal supply voltage of 3V, 5V, or 15V. 16V is the absolute maximum but it should not be the design voltage. We never design to absolute maximums - we usually design with safety margins specifically to avoid them.
    – J...
    2 days ago








  • 7




    "You should ALWAYS check the maximum ratings" - NO NO NO. You should check the (recommended) operating conditions! Please don't point anyone (especially not newbies) at the absolute maxima.
    – Wouter van Ooijen
    2 days ago








  • 1




    I would think it's a given that you don't go all the way to the maximum. That's why you check them. You should always check the maximum to make sure you stay within them
    – MCG
    2 days ago




















up vote
11
down vote













enter image description here



Figure 1. Vmax.



This line of the datasheet is stating that the maximum voltage difference between V+ and V- is 16 V.



You have probably damaged the op-amp.






share|improve this answer





















  • Oh I thought it is +16 to -16. :(( And it is damaged yes it doesn't function as it supposed to.
    – user164567
    2 days ago








  • 1




    I've never seen it written that way before but I take it to mean you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other. Sorry for your loss!
    – Transistor
    2 days ago






  • 1




    "you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other." Absolute maximum ratings should not be used for normal operation, so 0/15V or .15/0 V or -7/+7 V or a lower voltage.
    – Uwe
    yesterday


















up vote
8
down vote













I read your question as "yes I've read the datasheet, but its unclear". So let's address how to read the supply voltage range specification as the manufacturer Texas Instruments write it in their original product data sheet:




Supply Voltage (V+ - V-)... MAX 16V




You have a V+ of 15V and a V- of -15V.
Now we use the formula from the data sheet and get:



(15 - (-15)) = 15 + 15 = 30V


That's the way to interpret this voltage range specification. So yes, you are exceeding specified maximum supply voltage range by 14V.






share|improve this answer




























    up vote
    8
    down vote













    Other answers mentione the asbsolute maximum ratings, which is NOT what youy should look for when designing a functional system. Instead, you should use the recommended operating conditions. In this case, those specify 15.5V.



    enter image description here



    In your case, you could check the absolute maxima to find out whether your chip had a chance of survival. As others have pointed out, that is not the case.






    share|improve this answer

















    • 2




      Finally the only one answer using the recommended operating conditions! So the opamp may be used with very low voltages too, for instance -2/+2 V or 0/4 V. When reading a datasheet it is very important to look for both absolute maximum ratings and recommended operating conditions and read and respect them both. When using -7.5/+7.5 V, spikes on supply voltages should not exceed 0.25 V.
      – Uwe
      yesterday













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    4 Answers
    4






    active

    oldest

    votes








    4 Answers
    4






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    22
    down vote













    Yes, you are exceeding the specs. Look at table 6.1 of the DATASHEET on page 3:



    enter image description here



    It clearly states the maximum difference between the V+ and V- pins is 16V. This means you can have +8V and -8V, as the difference is 16V.



    As you have it right now, your difference is 30V, which is almost double the maximum ratings. Chances are, you have damaged the op-amp and it will need to be replaced. You should ALWAYS check the maximum ratings of any IC you are using if you are worried. If you can, try and be within the maximum, so +7.5V and -7.5V would work nicely here, for a total of 15V supply.






    share|improve this answer



















    • 3




      OP did check the maximum ratings, but was confused. And it seems to be guaranteed to function well for a 15 volt supply, so ±7.5 would be nice.
      – pipe
      2 days ago






    • 8




      "The jargon in the datasheet is not clear" sounds to me like he actually read it but did not understand it.
      – pipe
      2 days ago






    • 4




      Also worth noting that the chip is designed for a nominal supply voltage of 3V, 5V, or 15V. 16V is the absolute maximum but it should not be the design voltage. We never design to absolute maximums - we usually design with safety margins specifically to avoid them.
      – J...
      2 days ago








    • 7




      "You should ALWAYS check the maximum ratings" - NO NO NO. You should check the (recommended) operating conditions! Please don't point anyone (especially not newbies) at the absolute maxima.
      – Wouter van Ooijen
      2 days ago








    • 1




      I would think it's a given that you don't go all the way to the maximum. That's why you check them. You should always check the maximum to make sure you stay within them
      – MCG
      2 days ago

















    up vote
    22
    down vote













    Yes, you are exceeding the specs. Look at table 6.1 of the DATASHEET on page 3:



    enter image description here



    It clearly states the maximum difference between the V+ and V- pins is 16V. This means you can have +8V and -8V, as the difference is 16V.



    As you have it right now, your difference is 30V, which is almost double the maximum ratings. Chances are, you have damaged the op-amp and it will need to be replaced. You should ALWAYS check the maximum ratings of any IC you are using if you are worried. If you can, try and be within the maximum, so +7.5V and -7.5V would work nicely here, for a total of 15V supply.






    share|improve this answer



















    • 3




      OP did check the maximum ratings, but was confused. And it seems to be guaranteed to function well for a 15 volt supply, so ±7.5 would be nice.
      – pipe
      2 days ago






    • 8




      "The jargon in the datasheet is not clear" sounds to me like he actually read it but did not understand it.
      – pipe
      2 days ago






    • 4




      Also worth noting that the chip is designed for a nominal supply voltage of 3V, 5V, or 15V. 16V is the absolute maximum but it should not be the design voltage. We never design to absolute maximums - we usually design with safety margins specifically to avoid them.
      – J...
      2 days ago








    • 7




      "You should ALWAYS check the maximum ratings" - NO NO NO. You should check the (recommended) operating conditions! Please don't point anyone (especially not newbies) at the absolute maxima.
      – Wouter van Ooijen
      2 days ago








    • 1




      I would think it's a given that you don't go all the way to the maximum. That's why you check them. You should always check the maximum to make sure you stay within them
      – MCG
      2 days ago















    up vote
    22
    down vote










    up vote
    22
    down vote









    Yes, you are exceeding the specs. Look at table 6.1 of the DATASHEET on page 3:



    enter image description here



    It clearly states the maximum difference between the V+ and V- pins is 16V. This means you can have +8V and -8V, as the difference is 16V.



    As you have it right now, your difference is 30V, which is almost double the maximum ratings. Chances are, you have damaged the op-amp and it will need to be replaced. You should ALWAYS check the maximum ratings of any IC you are using if you are worried. If you can, try and be within the maximum, so +7.5V and -7.5V would work nicely here, for a total of 15V supply.






    share|improve this answer














    Yes, you are exceeding the specs. Look at table 6.1 of the DATASHEET on page 3:



    enter image description here



    It clearly states the maximum difference between the V+ and V- pins is 16V. This means you can have +8V and -8V, as the difference is 16V.



    As you have it right now, your difference is 30V, which is almost double the maximum ratings. Chances are, you have damaged the op-amp and it will need to be replaced. You should ALWAYS check the maximum ratings of any IC you are using if you are worried. If you can, try and be within the maximum, so +7.5V and -7.5V would work nicely here, for a total of 15V supply.







    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited 2 days ago

























    answered 2 days ago









    MCG

    5,62731443




    5,62731443








    • 3




      OP did check the maximum ratings, but was confused. And it seems to be guaranteed to function well for a 15 volt supply, so ±7.5 would be nice.
      – pipe
      2 days ago






    • 8




      "The jargon in the datasheet is not clear" sounds to me like he actually read it but did not understand it.
      – pipe
      2 days ago






    • 4




      Also worth noting that the chip is designed for a nominal supply voltage of 3V, 5V, or 15V. 16V is the absolute maximum but it should not be the design voltage. We never design to absolute maximums - we usually design with safety margins specifically to avoid them.
      – J...
      2 days ago








    • 7




      "You should ALWAYS check the maximum ratings" - NO NO NO. You should check the (recommended) operating conditions! Please don't point anyone (especially not newbies) at the absolute maxima.
      – Wouter van Ooijen
      2 days ago








    • 1




      I would think it's a given that you don't go all the way to the maximum. That's why you check them. You should always check the maximum to make sure you stay within them
      – MCG
      2 days ago
















    • 3




      OP did check the maximum ratings, but was confused. And it seems to be guaranteed to function well for a 15 volt supply, so ±7.5 would be nice.
      – pipe
      2 days ago






    • 8




      "The jargon in the datasheet is not clear" sounds to me like he actually read it but did not understand it.
      – pipe
      2 days ago






    • 4




      Also worth noting that the chip is designed for a nominal supply voltage of 3V, 5V, or 15V. 16V is the absolute maximum but it should not be the design voltage. We never design to absolute maximums - we usually design with safety margins specifically to avoid them.
      – J...
      2 days ago








    • 7




      "You should ALWAYS check the maximum ratings" - NO NO NO. You should check the (recommended) operating conditions! Please don't point anyone (especially not newbies) at the absolute maxima.
      – Wouter van Ooijen
      2 days ago








    • 1




      I would think it's a given that you don't go all the way to the maximum. That's why you check them. You should always check the maximum to make sure you stay within them
      – MCG
      2 days ago










    3




    3




    OP did check the maximum ratings, but was confused. And it seems to be guaranteed to function well for a 15 volt supply, so ±7.5 would be nice.
    – pipe
    2 days ago




    OP did check the maximum ratings, but was confused. And it seems to be guaranteed to function well for a 15 volt supply, so ±7.5 would be nice.
    – pipe
    2 days ago




    8




    8




    "The jargon in the datasheet is not clear" sounds to me like he actually read it but did not understand it.
    – pipe
    2 days ago




    "The jargon in the datasheet is not clear" sounds to me like he actually read it but did not understand it.
    – pipe
    2 days ago




    4




    4




    Also worth noting that the chip is designed for a nominal supply voltage of 3V, 5V, or 15V. 16V is the absolute maximum but it should not be the design voltage. We never design to absolute maximums - we usually design with safety margins specifically to avoid them.
    – J...
    2 days ago






    Also worth noting that the chip is designed for a nominal supply voltage of 3V, 5V, or 15V. 16V is the absolute maximum but it should not be the design voltage. We never design to absolute maximums - we usually design with safety margins specifically to avoid them.
    – J...
    2 days ago






    7




    7




    "You should ALWAYS check the maximum ratings" - NO NO NO. You should check the (recommended) operating conditions! Please don't point anyone (especially not newbies) at the absolute maxima.
    – Wouter van Ooijen
    2 days ago






    "You should ALWAYS check the maximum ratings" - NO NO NO. You should check the (recommended) operating conditions! Please don't point anyone (especially not newbies) at the absolute maxima.
    – Wouter van Ooijen
    2 days ago






    1




    1




    I would think it's a given that you don't go all the way to the maximum. That's why you check them. You should always check the maximum to make sure you stay within them
    – MCG
    2 days ago






    I would think it's a given that you don't go all the way to the maximum. That's why you check them. You should always check the maximum to make sure you stay within them
    – MCG
    2 days ago














    up vote
    11
    down vote













    enter image description here



    Figure 1. Vmax.



    This line of the datasheet is stating that the maximum voltage difference between V+ and V- is 16 V.



    You have probably damaged the op-amp.






    share|improve this answer





















    • Oh I thought it is +16 to -16. :(( And it is damaged yes it doesn't function as it supposed to.
      – user164567
      2 days ago








    • 1




      I've never seen it written that way before but I take it to mean you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other. Sorry for your loss!
      – Transistor
      2 days ago






    • 1




      "you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other." Absolute maximum ratings should not be used for normal operation, so 0/15V or .15/0 V or -7/+7 V or a lower voltage.
      – Uwe
      yesterday















    up vote
    11
    down vote













    enter image description here



    Figure 1. Vmax.



    This line of the datasheet is stating that the maximum voltage difference between V+ and V- is 16 V.



    You have probably damaged the op-amp.






    share|improve this answer





















    • Oh I thought it is +16 to -16. :(( And it is damaged yes it doesn't function as it supposed to.
      – user164567
      2 days ago








    • 1




      I've never seen it written that way before but I take it to mean you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other. Sorry for your loss!
      – Transistor
      2 days ago






    • 1




      "you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other." Absolute maximum ratings should not be used for normal operation, so 0/15V or .15/0 V or -7/+7 V or a lower voltage.
      – Uwe
      yesterday













    up vote
    11
    down vote










    up vote
    11
    down vote









    enter image description here



    Figure 1. Vmax.



    This line of the datasheet is stating that the maximum voltage difference between V+ and V- is 16 V.



    You have probably damaged the op-amp.






    share|improve this answer












    enter image description here



    Figure 1. Vmax.



    This line of the datasheet is stating that the maximum voltage difference between V+ and V- is 16 V.



    You have probably damaged the op-amp.







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 2 days ago









    Transistor

    79k777172




    79k777172












    • Oh I thought it is +16 to -16. :(( And it is damaged yes it doesn't function as it supposed to.
      – user164567
      2 days ago








    • 1




      I've never seen it written that way before but I take it to mean you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other. Sorry for your loss!
      – Transistor
      2 days ago






    • 1




      "you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other." Absolute maximum ratings should not be used for normal operation, so 0/15V or .15/0 V or -7/+7 V or a lower voltage.
      – Uwe
      yesterday


















    • Oh I thought it is +16 to -16. :(( And it is damaged yes it doesn't function as it supposed to.
      – user164567
      2 days ago








    • 1




      I've never seen it written that way before but I take it to mean you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other. Sorry for your loss!
      – Transistor
      2 days ago






    • 1




      "you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other." Absolute maximum ratings should not be used for normal operation, so 0/15V or .15/0 V or -7/+7 V or a lower voltage.
      – Uwe
      yesterday
















    Oh I thought it is +16 to -16. :(( And it is damaged yes it doesn't function as it supposed to.
    – user164567
    2 days ago






    Oh I thought it is +16 to -16. :(( And it is damaged yes it doesn't function as it supposed to.
    – user164567
    2 days ago






    1




    1




    I've never seen it written that way before but I take it to mean you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other. Sorry for your loss!
    – Transistor
    2 days ago




    I've never seen it written that way before but I take it to mean you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other. Sorry for your loss!
    – Transistor
    2 days ago




    1




    1




    "you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other." Absolute maximum ratings should not be used for normal operation, so 0/15V or .15/0 V or -7/+7 V or a lower voltage.
    – Uwe
    yesterday




    "you can run it 0/16V or -16/0 V or -5/+5 or any other combination provided that it's 16 V max from one to the other." Absolute maximum ratings should not be used for normal operation, so 0/15V or .15/0 V or -7/+7 V or a lower voltage.
    – Uwe
    yesterday










    up vote
    8
    down vote













    I read your question as "yes I've read the datasheet, but its unclear". So let's address how to read the supply voltage range specification as the manufacturer Texas Instruments write it in their original product data sheet:




    Supply Voltage (V+ - V-)... MAX 16V




    You have a V+ of 15V and a V- of -15V.
    Now we use the formula from the data sheet and get:



    (15 - (-15)) = 15 + 15 = 30V


    That's the way to interpret this voltage range specification. So yes, you are exceeding specified maximum supply voltage range by 14V.






    share|improve this answer

























      up vote
      8
      down vote













      I read your question as "yes I've read the datasheet, but its unclear". So let's address how to read the supply voltage range specification as the manufacturer Texas Instruments write it in their original product data sheet:




      Supply Voltage (V+ - V-)... MAX 16V




      You have a V+ of 15V and a V- of -15V.
      Now we use the formula from the data sheet and get:



      (15 - (-15)) = 15 + 15 = 30V


      That's the way to interpret this voltage range specification. So yes, you are exceeding specified maximum supply voltage range by 14V.






      share|improve this answer























        up vote
        8
        down vote










        up vote
        8
        down vote









        I read your question as "yes I've read the datasheet, but its unclear". So let's address how to read the supply voltage range specification as the manufacturer Texas Instruments write it in their original product data sheet:




        Supply Voltage (V+ - V-)... MAX 16V




        You have a V+ of 15V and a V- of -15V.
        Now we use the formula from the data sheet and get:



        (15 - (-15)) = 15 + 15 = 30V


        That's the way to interpret this voltage range specification. So yes, you are exceeding specified maximum supply voltage range by 14V.






        share|improve this answer












        I read your question as "yes I've read the datasheet, but its unclear". So let's address how to read the supply voltage range specification as the manufacturer Texas Instruments write it in their original product data sheet:




        Supply Voltage (V+ - V-)... MAX 16V




        You have a V+ of 15V and a V- of -15V.
        Now we use the formula from the data sheet and get:



        (15 - (-15)) = 15 + 15 = 30V


        That's the way to interpret this voltage range specification. So yes, you are exceeding specified maximum supply voltage range by 14V.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 2 days ago









        dlatikay

        501210




        501210






















            up vote
            8
            down vote













            Other answers mentione the asbsolute maximum ratings, which is NOT what youy should look for when designing a functional system. Instead, you should use the recommended operating conditions. In this case, those specify 15.5V.



            enter image description here



            In your case, you could check the absolute maxima to find out whether your chip had a chance of survival. As others have pointed out, that is not the case.






            share|improve this answer

















            • 2




              Finally the only one answer using the recommended operating conditions! So the opamp may be used with very low voltages too, for instance -2/+2 V or 0/4 V. When reading a datasheet it is very important to look for both absolute maximum ratings and recommended operating conditions and read and respect them both. When using -7.5/+7.5 V, spikes on supply voltages should not exceed 0.25 V.
              – Uwe
              yesterday

















            up vote
            8
            down vote













            Other answers mentione the asbsolute maximum ratings, which is NOT what youy should look for when designing a functional system. Instead, you should use the recommended operating conditions. In this case, those specify 15.5V.



            enter image description here



            In your case, you could check the absolute maxima to find out whether your chip had a chance of survival. As others have pointed out, that is not the case.






            share|improve this answer

















            • 2




              Finally the only one answer using the recommended operating conditions! So the opamp may be used with very low voltages too, for instance -2/+2 V or 0/4 V. When reading a datasheet it is very important to look for both absolute maximum ratings and recommended operating conditions and read and respect them both. When using -7.5/+7.5 V, spikes on supply voltages should not exceed 0.25 V.
              – Uwe
              yesterday















            up vote
            8
            down vote










            up vote
            8
            down vote









            Other answers mentione the asbsolute maximum ratings, which is NOT what youy should look for when designing a functional system. Instead, you should use the recommended operating conditions. In this case, those specify 15.5V.



            enter image description here



            In your case, you could check the absolute maxima to find out whether your chip had a chance of survival. As others have pointed out, that is not the case.






            share|improve this answer












            Other answers mentione the asbsolute maximum ratings, which is NOT what youy should look for when designing a functional system. Instead, you should use the recommended operating conditions. In this case, those specify 15.5V.



            enter image description here



            In your case, you could check the absolute maxima to find out whether your chip had a chance of survival. As others have pointed out, that is not the case.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 2 days ago









            Wouter van Ooijen

            44k150117




            44k150117








            • 2




              Finally the only one answer using the recommended operating conditions! So the opamp may be used with very low voltages too, for instance -2/+2 V or 0/4 V. When reading a datasheet it is very important to look for both absolute maximum ratings and recommended operating conditions and read and respect them both. When using -7.5/+7.5 V, spikes on supply voltages should not exceed 0.25 V.
              – Uwe
              yesterday
















            • 2




              Finally the only one answer using the recommended operating conditions! So the opamp may be used with very low voltages too, for instance -2/+2 V or 0/4 V. When reading a datasheet it is very important to look for both absolute maximum ratings and recommended operating conditions and read and respect them both. When using -7.5/+7.5 V, spikes on supply voltages should not exceed 0.25 V.
              – Uwe
              yesterday










            2




            2




            Finally the only one answer using the recommended operating conditions! So the opamp may be used with very low voltages too, for instance -2/+2 V or 0/4 V. When reading a datasheet it is very important to look for both absolute maximum ratings and recommended operating conditions and read and respect them both. When using -7.5/+7.5 V, spikes on supply voltages should not exceed 0.25 V.
            – Uwe
            yesterday






            Finally the only one answer using the recommended operating conditions! So the opamp may be used with very low voltages too, for instance -2/+2 V or 0/4 V. When reading a datasheet it is very important to look for both absolute maximum ratings and recommended operating conditions and read and respect them both. When using -7.5/+7.5 V, spikes on supply voltages should not exceed 0.25 V.
            – Uwe
            yesterday




















             

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