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ADC128S102 output state at loss of power

Steve Maltrud
Prodigy 250 points
Other Parts Discussed in Thread: ADC128S102

Two questions re: the ADC128S102:

1)  Can tell me what happens to Dout on the ADC128S102 when input power goes to zero.  Does the Dout go to high impedance or does it load the line somehow?

 

2)  Also, can you you please supply to me the failure rate information on this part?  Purchase part number is 5962R0722701VZA (ADC128S102WGRQV).

Thanks,

Steve Maltrud

Avnet FAE, Denver

  • 0
    TI__Genius 17125 points

    Hello Steve,

    Please note that we have  forums specifically for precision data converters and for high reliability products.

    On your first question, are you asking what is the stat of Dout if you have no analog input on any of the channels, or if you don't haven supply voltage to one of the supply lines (Va or Vd)?

    Without an analog input on the active channel,  ideally Dout should be continuously low for an output of 0 LSB.  The serial data from Dout could be something higher based on offset error and noise in the application.

    Generic FIT rate data can be found under the package and quality tab on the ADC128S102QML product page on ti.com.

    www.ti.com/.../quality

    Let me now if this answers your question by checking the verified answered box or please reply with more details.

  • 0 in reply to Kirby Kruckmeyer96848
    Prodigy 250 points

    Kirby,

     

    Thanks for the answer.  Hope you’re doing well.  With respect to the 1st question, I was more asking about the latter – what is the Dout condition with loss of Voltage rails (Va and Vd). 

     

    Also thanks for the Vout condition when analog input is lost.  This info will also be helpful to my customer.

     

    Thanks,

     

    Steve

  • 0 in reply to Steve Maltrud
    TI__Genius 17125 points

    Hi Steve,

    First off, be sure not to violate the abs max limits of the part, in that no pin should be taken 0.3V above Va.   This includes Vd and Dout.

    Dout does not have a tristate or high impedance mode.