Hi, Jason.
It's the best practice to use RESET pulse to initialize the ADAS3023 after following the recommended power up sequence on page 24 in the datasheet. There is a description of RESET and PD timing requirements (figure 46) on page 26 in the datasheet. RESET must be applied after returning PD to low to restore the ADAS3023 digital core, including CFG register, to its default state and the user has to keep RESET low for another 100ns after PD release. Therefore, the desired CFG must be rewritten to the device and one dummy conversion must be completed before the device operation is restored to the configuration programmed prior to PD assertion.
Note that upon the device returning from power-down mode or from a reset when the default CFG is not used, there is no tACQ requirement because the first two conversions from power-up are undefined/invalid because the one-deep delay pipeline requirement must be satisfied to reconfigure the device to the desired setting.
Regards,
Karen