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Questions about I/O ,crystal of nRF51822

Hi

I want to use the nRF51822 to do the BLE product.I have read the datasheet of nRF51822.I have some questions:

1、Can the I/O of nRF51822 support 4.5V~5V input? 2、Can nRF51822 use the active oscillator?I think it is more stable than passive crysta. 3、For the power mode,if I have done as "nRF51822 QFN48 schematic with internal DC/DC converter",however,when the DC/DC is disable,is 51822 works in the LDO mode?

Look forward to your reply.Thank you very much.

King regards, Alice

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