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Q: What is the correct power supply sequence for the ADAS3023 to operate properly?
A: The ADAS3023 requires these five supplies: AVDD = +5V, DVDD = + 5V, VDDH = + 15V, VSSH = - 15V, and VIO = 1.8V to 5V. The user must bring up the ADAS3023 power supplies in the following sequence in order to operate it normally:
In order to operate the ADAS3023 from a + 5V single supply, the user would need to generate the required +/-15V high voltage supplies using one of our switching converters such as the ADP1613/14 in SEPIC-Cuk topology. Refer to CN-201 for complete information on this test setup.
My customer understands the need for sequencing the supplies. Due to board constraints, they do not have board space for to add a power sequencer. They wanted to know if it is possible (or if anyone has done it) to put an R before decoupling capacitor to form different time constant to reach the sequence?
Its recommended to follow the exact sequence to make sure the parts works normally.Here's the link of discussion for recommended power up sequence. https://ez.analog.com/thread/79375#comment-235711