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REF6050: Remote Sensing

ttd
Mastermind 8720 points
Part Number: REF6050
Other Parts Discussed in Thread: ADS8862

Dear Technical Support Team,

Do the OUT_S and GND_S of the REF6050 support pin remote sensing?
We currently have the REF6050 mounted on a universal board with 5V power and GND wired to the target.
If remote sensing is possible, let me also place the GNS_S and OUT_S wires close to the target to see if I can ignore the effects of drops, etc. caused by the cables.

Best Regards,

ttd

  • 0
    TI__Genius 9310 points

    Hello ttd,

    Yes, OUT_F and OUT_S pins should be shorted as close to the target as possible to reduce IR drop. What is the application of REF6050 in this case?

    Thanks,

    Jackson

  • 0 in reply to Jackson Wightman
    Mastermind 8720 points

    Hi Jackson,

    Thank you for your reply.

    Application is ADS8862(680ksps) reference  voltage for 5V.

    MY board has REF5050 so I will try to change from REF5050 to REF6050 for improving settling error.

    Following are configuration on the universal board(Stripboard). REF5050 accept 8V but REF6050 doesn't it. So inserted LDO.

    8V⇒LOD(TPA7A4901)⇒5.4V⇒REF6050⇒5V⇒ADS8862

     ADS8862 Datasheet has REF6050 configuration. In my board has 120kΩ for SS(±3mA).

    Figure 63. DAQ Circuit for a 1.5-µs, Full-Scale Step Response

    Best Regards,

    ttd

  • 0 in reply to ttd
    Mastermind 8720 points

    Hi Jackson,

    I understood that remote sensing on the board would be ok, but in my case, it is wired with from 2 cm to 5cm of cable from REF6050 on the universal board(Stripboard).
    I am concerned if the remote sensing will keep it within the expected range. I'd like to supply 5V on ADC REFPIN.


    I think remote sensing of general power supply ICs can only correct about several 10mV.

    How about range(mV) for IR drop correction?

    REF has low current, so I think that IR drop may not be a problem(a fine adjustment of mV?)

    Best Regards,

    ttd

  • 0 in reply to ttd
    TI__Genius 9310 points

    Hi ttd,

    I don't foresee 5cm being an issue. What is the expected range of accuracy that you are trying to meet for your system?

    Thanks,

    Jackson