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REF5050: Output Noise Spectral Density

Paul Zhu
Prodigy 40 points

Part Number: REF5050

In REF50 datasheet, does figure 7-14 Noise Spectral Density show data for REF5025? Somewhere in the datasheet it says with higher output voltage, the noise spectral density needs to be scaled proportionally, so how would REF5050 noise spectral density look?

Thanks!

  • +1
    TI__Expert 8630 points

    Hi Paul,

    For figure 7-14, the noise density is given in units of nV/V/(sqrt(Hz)), so to find the values for REF5050 using the plot, you would multiply the output voltage (5 V) times the number of nV/V/(sqrt(Hz)). For example, assuming at 20 Hz we see a value of approximately 35 nV/V/sqrt(Hz), we would multiply that number by 5 V and get approximately 175 nV/sqrt(Hz).

    Similarly, in the electrical characteristics table, the output voltage noise is given as 0.9 µVrms/V. Using at REF5050, for example, this would be 0.9 µVrms * 5 V = 4.5 µVrms.

    Thanks,

    Jackson