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LM96080 fully compatible with LM80?

Gabriel Perez
Prodigy 40 points
Other Parts Discussed in Thread: LM96080, LM80

Hello,

My question is basically centered around the fact that ADC values stored for the LM96080 are 10bit long vs 8bits in the LM80.

I'm trying to figure out how the part maintains SW  compatibility given the that the width of the returned data (expected) is 10 and not 8.

The only thing I can think of is truncation of the lower 2 bits, but I have not being able to receive an official confirmation from TI.

Can someone help?

Thanks

  • 0
    TI__Expert 4905 points

    Hi Gabriel,

    See attached file for a detailed comparison of the two devices. If you need anything else please let me know!

     

    Take care,

    Emmy Denton
    Precission Systems Applications
    Silicon Valley Analog
    Texas Instruments


    8321.LM96080toLM80Comparison20120402.zip

     

  • 0 in reply to Emmy Denton
    Prodigy 40 points

    Hello,

    Tha attachment helped a lot with the question I posted above. However, there is one more detail concerning

    the "pin compatibility" for both parts:

    Supply Voltage: Does the LM96080 take supply voltages as low as 2.8V like the LM80? I can see from the data sheet it is not the case, but just wanted to confirm.

     Hysterisis Voltage: What is the hysterisis voltage for LM80? these values are presented in the LM96080, but there is no information on its equivalent for the LM80. It would be nice to have this data to evaluate full compatibility.

    Thanks

  • 0 in reply to Gabriel Perez
    TI__Expert 4905 points

    Hi,

    The parts are pin compatible. As a matter of fact if you have source code for the LM80, you should be able to put the LM96080 down on the board and it should work. You should only need to change your code if you want to take advantage of the extended resolution of the LM96080 or some other function as listed in the document I sent you.

    As for your new questions:

    Supply Voltage: as the comparison document states the LM96080 is only guaranteed for operation down to 3.0V and up to 5.5V. There is a whole section that describes the power supply differences. Please read it.

    Hysteresis Voltage: both devices have comparable hysteresis - we just did not specify it on the LM80. No worries here either.

    Take care,

    Emmy

    Precision Systems Applications