Hi Frank, Yes, you can connect the same supply to VNN and VSUB. Please make sure the output doesn't go too much lower than VNN during transient (overshoot). Less than 5% overshoot is reasonable. You have to turn on -48V first, then 3.3V, 1.8V, -10V, 10V and then 48V. When turning off, you need to turn off the 48V, 10V, -10V, 1.8V, 3.3V and then last -48V. Regards, Charles
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