Does the output noise of the ADM7154/ADM7155 scale with the output voltage?

Q 

Does the output noise of the ADM7154/ADM7155 scale with the output voltage?

 

A 

Unlike the majority of low noise LDOs where the output noise increases with the
output voltage,  the unique architecture of the ADM7154/ADM7155 keeps
the output noise independent of  output voltage for the fixed output
voltage models. 
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Anonymous
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  • Hello All, can anyone please let me know what is the value of the voltages on the REF_SENSE , REF & VREG pins of ADM7154ACPZ-3.3?

  • in reply to sidmohan

    Hi Sidmohan,

     

    1. REF - The REF voltage, and internal reference voltage, is proportional to the VOUT voltage. So, if VOUT=3.3V, then the internal reference and VREF is 3.3V’s. The path from the internal reference to VREF to VOUT is kept in unity gain configuration. REF and REF_SENSE need to be shorted together, so this is always in unity gain configuration.
    2. VREG – The VREG is programmed to be “VREG = VOUT + 0.3V or 2.0V, whichever is greater”. This is designed to optimize headroom and PSRR.

     

    Thanks,

    Alex

Comment
  • in reply to sidmohan

    Hi Sidmohan,

     

    1. REF - The REF voltage, and internal reference voltage, is proportional to the VOUT voltage. So, if VOUT=3.3V, then the internal reference and VREF is 3.3V’s. The path from the internal reference to VREF to VOUT is kept in unity gain configuration. REF and REF_SENSE need to be shorted together, so this is always in unity gain configuration.
    2. VREG – The VREG is programmed to be “VREG = VOUT + 0.3V or 2.0V, whichever is greater”. This is designed to optimize headroom and PSRR.

     

    Thanks,

    Alex

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