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TI Home » TI E2E Community » Support Forums » Data Converters » Precision Data Converters » Precision Data Converters Forum » AMC7812 Internal DAC resistance
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AMC7812 Internal DAC resistance

AMC7812 Internal DAC resistance

This question is answered
Carlos Luis Bernal Quintero
Posted by Carlos Luis Bernal Quintero
on Jul 18 2012 22:32 PM
Prodigy30 points

I'm using the AMC7812's DACs to margin some Voltage regulators. I have a series resitor connected between the AMC DAC output and the VR's feedback.

While the DAC is not configured the internal resistor ~10K affects my feedback voltage.  How do you recomend to use the AMC to margin VRs?

 

12 bit DAC AMC7812 DAC Internal resistor
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  • Tony Calabria
    Posted by Tony Calabria
    on Jul 19 2012 17:50 PM
    Verified Answer
    Verified by Tom Hendrick
    Mastermind42750 points

    Hi Carlos,

    I do not believe that the internal 10k pull down resistor can be disabled. Could you send a schematic of your output to show what you are doing.

    Regards,

    Tony Calabria

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  • Carlos Luis Bernal Quintero
    Posted by Carlos Luis Bernal Quintero
    on Jul 21 2012 09:43 AM
    Prodigy30 points

    Thank you Tony.

    Attached you'll find a simplified diagram of our margining interface

    Regards,

     

    CLBernal

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  • Tom Hendrick
    Posted by Tom Hendrick
    on Jul 29 2012 13:47 PM
    Guru86220 points

    Hi Carlos,

    The 10K internal to the AMC7812 cannot be disabled - have you considered using an analog switch to isolate your regulator?  Perhaps something like the MAX4954 would be useful as a means to isolate/open the circuit.

     

    Regards,

    Tom

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  • Carlos Luis Bernal Quintero
    Posted by Carlos Luis Bernal Quintero
    on Jul 29 2012 22:27 PM
    Verified Answer
    Verified by Carlos Luis Bernal Quintero
    Prodigy30 points

    Thank you Tom.

    That's what we will do for Rev B but i was looking for a software solution for Rev A.

    Regards,

    CLBernal

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