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TLV5638-EP: Offset difference between channel A and B of the same device

Torben Hensel
Prodigy 30 points
Part Number: TLV5638-EP

Hello,

is the any Information on how much the zero-scale offset differers between channel A and B on the same chip?

I have not found that Information in the datasheet. So I would assume the worst case from one output being at the lower end of the Zero-scale error and the other at the upper end. That would be 48 mV according to the datasheet.

Am I right or can you narrow it a bit down?

Thanks

  • 0
    TI__Mastermind 18546 points

    Hi Hensel,

    Your understanding is correct, since we say zero scale error as +/-24mV, one output can be at -24mV and other output can be at +24mV for code zero. So worst case can be 48mV as you inferred from datasheet. Since this device has only Unipolar output, you will never see an offset of -24mV at the output of either amplifiers.

    What does this means that if you load DAC with all zero codes, one will output +48mV (worst case) and other can be still zero. and if you keep increasing DAC code, there will be a point, at which you will see a positive change in voltage for the DAC which was previously zero volts, that can be couple of LSB's code change corresponding to +24mV.

    May I know what kind of application you are looking with TLV5638-EP?

    Regards,

    AK

  • 0 in reply to Akhilesh K
    Prodigy 30 points

    Yes, it is a 0 to 5 V Output for a sensor. And a good Zero (<15mV) is important.

    As I see it, there is no problem to correct an negative offset by software, in exchange  for same resolution. But a positive offset has to be dealed with in Hardware.

    Thanks for your fast answer.

    Regards

    TH

  • 0 in reply to Torben Hensel
    TI__Mastermind 18546 points

    Hi Hensel,

    Absolutely, you can always correct negative offset in exchange for resolution. Did you have a look at other dual output DAC in our portfolio? If you are looking for EP product with 12bit , this is the option,

    Let me know you need any other help regarding the same.

    Regards,

    AK

  • 0 in reply to Akhilesh K
    Prodigy 30 points

    Yes I looked at your portfolio and it is the only one with the right temperature range for our application.

    Thanks again for your fast answers.

    Regards,

    TH