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OPA656: Table 7.6 Electrical Characteristics : +/-5V: High Grade DC Specifications

Robert Fusco
Prodigy 120 points
Part Number: OPA656
Other Parts Discussed in Thread: OPA657

Why does Table 7.6 Title indicate +/-5V?  Other specs don't provide a voltage in the title/header, so are presumed to be be 4.5-5.5V.  This may be obvious, but please confirm that the High Grade specifications are also over 4.5-5.5V, not just at 5.00V. 

In Table 7.6, Input Offset voltage is specified under MIN.  This should be MAX.  Also units are incorrect, mA and dB mixed in Table 7.5.  

Thanks

  • 0
    Guru 140200 points
    Hi Robert,

    "specified operating voltage" is +/-5V. See page 6 of datasheet. So, all the data should be valid for +/-5V supply voltage. For +/-4.5V...+/-5.5V supply voltages the most parameters should be very similar, though.

    Kai
  • 0 in reply to kai klaas69
    Prodigy 120 points
    Your first sentence seems to be saying specified operating voltage is +/-5.00V, tolerance +/- 0.00V. "should be valid" and "should be similar" are not what I am seeking to confirm.
    Also, will TI fix the other errors, or at least acknowledge that these are errors?
    Thanks,
    Bob
  • 0 in reply to Robert Fusco
    TI__Genius 15565 points
    Hello Robert,

    Thank you for bringing the errors to our attention, we will look into getting this updated.

    Both tables were tested under a configuration of +/-5V. I imagine the 4.5V - 5V you are referring to is the one found under PSRR? That is specifically for the PSRR spec to test the functionality of the device as the power supply is varied.

    The "High Grade" specs are referring to the OPA656UB and OPA656NB packages whose specs vary from other package types and are shown in table 7.6, any spec not listed under table 7.6 is the same for both high-grade and standard-grade devices. Hope this clarifies things.

    Best,
    Hasan Babiker
  • 0 in reply to Hasan Babiker31
    Prodigy 120 points

    It's still not clear to me if Table 7.6 min/max specs are at 5.00V, or over the range 4.5V - 5.5V.

    For example, the first spec is Input Offset Voltage.  Over -40 to +85C junction temperature range, is Vos guaranteed to be <0.9V at 5.00V, or over the range 4.5-5.5V? 

  • 0 in reply to Robert Fusco
    TI__Genius 15565 points
    Hello Robert,

    Both tables 7.5 & 7.6 are specified at +/- 5V. The datasheet will be updated to reflect this similar to what is shown in the datasheet of the OPA657.

    Best,
    Hasan Babiker
  • 0 in reply to Hasan Babiker31
    Prodigy 120 points
    OK. This presents a bit of a challenge for designs with 4.99V or 5.01V supplies. We'll accommodate for that somehow.
    Thanks,
  • 0 in reply to Robert Fusco
    Guru 140200 points

    Hi Robert,

    when you look into the datasheet of a usual OPAmp you will find that many parameters are specified for a supply voltage of +/-15V, e.g. But, of course, this does not mean that the OPAmp must be supplied with +/-15V...

    Kai