PCM3060: Vcc, Vdd Sequence

Hello,

Yes, it is recommended that VCC powers first, and then VDD.  The easiest way to achieve this is to have the VDD supply derived from the VCC supply.  This is explained in the Power Supply section near the end of the datasheet:

The digital and analog power supply lines to the PCM3060 should be bypassed to the corresponding ground pins with 0.1-µF ceramic and 10-µF electrolytic capacitors as close to the pins as possible to maximize the dynamic performance of the ADC and DAC. Although the PCM3060 has two power lines to maximize the potential of dynamic performance, using one common source, 5-V power supply for VCC and a 3.3-V power supply for VDD which is generated from the 5-V power supply for VCC, is recommended to avoid unexpected problems, such as latch-up, from incorrect power supply sequencing.

Hi Kuramochi,

Yes, the customer's suggestion will work fine.  The VDD 3.3V supply does not need to be derived from the +5V VCC supply, but does need to rise after VCC as they're planning.