I want to run an AM1808 at 456 MHz. The recommended operating conditions at this frequency, as given in the data sheet, are 1.3 V for CVDD and RVDD.
In the Power-On sequence paragraph (data sheet § 5.3.1), I see the following :
1) "If the RTC is not used, RTC_CVDD should be connected to CVDD." This is a problem for me because I want to have CVDD at 1.3 V and the maximum recommended operating condition for RTC_CVDD is 1.32 V. If I connect CVDD with RTC_CVDD, I should have less than 1.5 % tolerance on my 1.3 V rail. Is there another solution?
2) Core logic supplies. CVDD should be first then all static core logic supplies. However, as I have RVDD at 1.3 V, all static core logic supplies are not going to be controlled from the same power supply and powered up together unless I connect everything to the 1.3 V supply but with the same 1.5 % tolerance problem as stated above.
What are the recommended power connections and power-on sequence if the operating frequency is 456 MHz (and if the RTC is not used) ?
