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ISO122 Power-up sequence

Toshio Ushikubo
Mastermind 9620 points

Other Parts Discussed in Thread: ISO122

Hello,

Please advice ISO122 power-up sequence restriction of –Vs1, +Vs1, -Vs2 and +Vs2.

Regards.

  • 0
    TI__Guru* 93105 points

    Ushikubo-san,

    The intended power-up cycle for the ISO122 is the same as it is for nearly all analog integrated circuits; they are intended to have all supplies - positive and negative - brought up simultaneously. That is the way they are powered on and off during internal test and characterization. No special characterization evaluating different power supply sequencing is done.

    Regards, Thomas

    PA - Linear Applications Engineering 

  • 0 in reply to Thomas Kuehl
    Mastermind 9620 points

    Hello Tomas-san,

    Thank you for your answer.

    Please answer additional question.

    < Q1 >

    Are there any power-up restriction between  Vs1 and Vs2 ?

    < Q2 >

    Customer plan to supply “15V +/-5%” to +Vs1/+Vs2 and “-15V +/-5%” to –Vs1/-Vs2.

    Please advice if above tolerance between + and – power supply is OK.

    Best Regards.

  • 0 in reply to Toshio Ushikubo
    TI__Guru* 93105 points

    Ushikubo-san,

    The normal ISO122 power sequence has all of the supplies, +Vs1, -Vs1, +Vs2, -Vs2 powered up, or down, at the same time. No formal characterization of other power sequences has been done. Although no damage has been reported when customer's have brought +Vs1/-Vs1 before +Vs2/-Vs2, or visa versa, the output behavior during such power sequences has not be characterized and cannot be assured.

    The customer's plan to employ 15V +/-5%” to +Vs1/+Vs2 and “-15V +/-5%” to –Vs1/-Vs2 is very good.

    Regards, Thomas

    PA - Linear Applications Engineering