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Power-on reset of AD5791

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Product Number: AD5791,DAC
Software Version: AD5791,DAC

Hi everyone:

The device incorporates a power-on reset circuit that ensures the DAC output powers up to 0 V and in a known output impedance state. But  there are so many powers of  AD5791, such as VDD, VCC, VSS, IOVCC ,So, Which power supply does power-on reset refer to?And AD5791 has POWER-UP SEQUENCE,VDD should before VCC,when VDD power on but VCC not ,what state of the DAC output?

Thanks