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What power supplies does the AD7961 require? Does it power down?
The AD7961 operates from 1.8V and 5V supplies (VDD1 = +5V, VDD2 = +1.8V, VIO = +1.8V), dissipating only 39 mW at 5-MSPS when converting in self-clocked mode. The power dissipation scales linearly with throughput. When powering up the AD7961 device, first apply 1.8 V (VDD2, VIO) to the device, then ramp 5 V (VDD1) and apply an external reference voltage. Apply the analog inputs last. The AD7961 powers down when EN3 to EN0 = X000 and operates in snooze mode when EN3 to EN0 = XX11 using the correct reference choice. Refer to CN-277 or UG-581 for complete information on how to generate the required supplies for the AD7961.