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XTR300: OPA OUTPUT SWING TO RAIL.

Kengo.Y
Guru 11255 points
Part Number: XTR300

Hi team,

I'm looking at Figure 8 of the datasheet.
I know this data is a typ value.
How much variation can you think of MIN/MAX of this value?
It does not have to be a guaranteed value.



Sincerely.
Kengo.

  • 0
    Guru 317370 points

    The typical output impedance is usually half that of the worst-case output impedance.

    This device does not have rail-to-rail outputs, so you cannot use twice the voltage drop. But can estimate if from the current: the typical 20 mA curve should be approximately the same as the worst-case 10 mA curve.

  • +1 in reply to Clemens Ladisch
    TI__Guru 55466 points

    Hi Kengo,

    The XTR300 datasheet Electrical Characteristic table on page 5 offers a Voltage Output Swing from Rail specification of minimum (V-) +3V and maximum V(+) -3V at 25C with a load of IDRV=± 24mA.  Figure 8 shows a typical output swing of |Vs - VOUT| = ~1.825V from the rail at 25C, and typical output swing |Vs - VOUT| = 2.0V at ~85C and |Vs - VOUT| = ~1.62V at -40C with +24mA load. 

    As you have mentioned, the datasheet does not provide a Min/Max specification for output swing over temperature and current. Assuming a similar rate of change for the max 3V output swing at 25C from the rail with 24mA load, a rough estimate for output swing would be around ~3.3V from the rail with ± 24mA load at +85C and ~2.8V with ± 24mA load at -40C.

    Thank you and Regards,

    Luis

  • 0 in reply to Luis Chioye
    Guru 11255 points

    HI Luis,

    Thank you for your reply.
    I understood about ± 24mA load.
    How about ± 10mA load?
    There is no MIN / MAX data at 10mA in the datasheet, so I'd like to know a value.
    (*Don't need guaranteeing.)

    Sincerely.
    Kengo.

  • +1 in reply to Kengo.Y
    TI__Guru 55466 points

    Hi Kengo,

    Unfortunately, I don't have additional output swing vs current and temperature data beyond the datasheet plots.

     Figure 8 shows a typical output swing of |Vs - VOUT| = ~1.5V from the rail at 25C, and typical output swing |Vs - VOUT| = 1.57V at ~85C and |Vs - VOUT| = ~1.42V at -40C with +10mA load.   

    An extrapolation or a rough estimate for max output swing to rail would be around |Vs - VOUT| = ~2.48V at 25C,  ~2.55V at +85C and ~2.4V at -40C with ± 10mA load.

    Thank you and Regards,

    Luis