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OP Amp parameters question

Kuo Nowal
Expert 2315 points
Other Parts Discussed in Thread: LM158, OPA333, TL072, OPA2333


Hi Sir,


About TI's OP Amp Specifications, please let me know, thank you.

Rail to Rail in web select tool, it is often written in, in / out, in to V-, in to V +, in datasheet which parameters can be seen to be above state? Different Rail to Rail applicable where?

E.g,

LM158 >> in to V-

OPA333 >> in / out

TL072 >> in to V +

 

ADI OP Amp is to be defined as a parameter Amps per Package, which means ??

TI's OP Amp specifications, that have this parameter ??

  • 0
    TI__Prodigy 575 points
    Hello Kuo,

    The "Rail to Rail" parameter refer's to a device's input voltage range and output voltage swing limitations. They can best be described as follows:

    In: Full input voltage range up to or beyond both the positive and negative supply rails
    In to V-: Input voltage range up to or beyond the negative supply rail
    In to V+: Input voltage range up to or beyond the positive supply rail
    Out: Full output voltage swing between the positive and negative supply rails

    Specifically, for the examples you provided:

    LM158: Input signal can be as low as ground (0V)
    OPA333: Input signal range can be up to 100mV beyond the supply rails, and the output signal can swing within 50mV of the supply rails
    TL072: Input signal can be as high as the maximum supply voltage of +36V

    Regarding your other parameter question, I believe what you are asking about is the total number of amplifiers that make up a given device. At TI, we define this parameter as the "Number of Channels". A single channel device will contain one amplifier in a given package; a 2-channel device will have 2 amplifiers, and so on.

    For example, the OPA333 is a single channel device and contains one amplifier internally, whereas the OPA2333 is a dual-channel device, meaning it is composed internally of two OPA333s. Note that the pin configurations will differ between single and multi-channel devices, so please refer to the datasheets for specific pin differences.

    Thank you for your interest in TI's devices, and please let us know if we can be of any further support on E2E.

    Christopher Stemple
    Product Marketing - Operational Amplifiers
  • 0 in reply to Christopher Stemple
    Expert 2315 points
    Hi Sir,

    Thanks for your reply, is helpful for me.

    if OK, can let me know different rail to rail application where
    What application have In to V-
    What application have In to V+
    What application have In to Full input voltage range
    What application have In to Full output voltage swing
  • 0 in reply to Kuo Nowal
    TI__Guru*** 140146 points
    Kuo,

    In order,
    Low side current sense
    High side current sense
    Unity gain
    ADC signal scaling. Unity gain for both full.
  • 0 in reply to Ron Michallick
    TI__Prodigy 575 points
    Kuo,

    Following up on Ron's recommendations, I want to encourage you to check out TI Precision Labs, which is a video series dedicated to explaining different op amp characteristics in depth. We have a module dedicate specifically to input and output limitations, which you can view here:

    training.ti.com/ti-precision-labs-op-amps-input-and-output-limitations

    You'll need to login with your myTI account.

    Thanks again for your interest and I believe the Precision Labs video will give you a lot of insight into op amp common mode limitations.

    Chris