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About Viso of ADum5402

Typical specifications are at TA = 25°C, VDD1 = VSEL = VISO = 5 V. Minimum/maximum specifications apply over the entire recommended operation range which is 4.5 V ≤ VDD1, VSEL, VISO ≤ 5.5 V; and −40°C ≤ TA ≤ +105°C, unless otherwise noted. Switching specifications are tested with CL = 15 pF and CMOS signal levels, unless otherwise noted.

Viso : Min 4.7V, Typ 5.0V, Max 5.4V (IISO=0mA)


VDD1&VSEL is the case from 4.9V to 5.1V, How much voltage is the MIN and MAX of Viso characteristics?


-40°C ≤ TA ≤ +85°C

4.9V≤ VDD1, VSEL ≤5.1V

70mA ≤ IISO ≤ 80mA

Load Regulation, please estimated at 5% (IISO = 10 mA to 90 mA ) of the worst.

For example, if the MAX of Viso is 5.1V, 5.1 × 0.05 = 0.255V

Therefore, MAX of Viso is, 5.1 + 0.255V = 5.255V

Best regard,

  • Bee: The ADum540x is only specified for load regulation for the datasheet conditions, which at 10 to 90mA exceed your conditions, so 5% change will apply to 70 to 80mA load as well.

    If the output were at the maximum of 5.4V and then loaded 70 to 80mA, the output voltage could vary a max of 5%, which could be 5.4V + 0.27V = 5.67V max.

    Regards, Brian

  • Dear Mr. Bkennedy,

    Thank you for letting me know.

    Even VDD1 = 5.1V (Input Voltage), it's not a VISO = 5.1V (Output Voltage).

    Even VDD1 = 5.1V, MAX of VISO might become 5.67V in the worst case.

    I understand (process capability, device mismatch, etc.).

    Thank you very much.

    Best regards,