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Capacitor for LTC2986 VREFOUT

  • I have a design based on the LTC2986, but currently having trouble about capacitors of VREFOUT.

    The design files, including Gerbers and PDF artwork, as well as PDF schematic can be found on the DC2608A, but I am confused about the capacitor of VREFOUT. I find a 10uF capacitor and a 1 Ω resister in series.

    So, I want to know ,is this 1Ω resister necessary, or does there need ESR about capacitor?