Can the ADF4350 be programmed with the CE pin pulled low?
Register contents can be changed when the device is in powerdown (Either software or hardware enabled).
But the part needs to be powered up for the band select logic to choose the correct frequency. This occurs during an update of R0. So it is possible to update all other registers while the part is in powerdown. But it must be powered up to do a correct R0 update.
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