ADF41020: FAQ

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ADF41020 volatile registers

Question In the datasheet of ADF41020 it says under “applications” mobile systems, automotive systems and handheld radios. Surely the PLL chips inside have to be non-volatile. But ADF41020 seems to…
Differences between ADF41020 and ADF4108

Question What is the differences between ADF41020 and ADF4108? Answer The ADF41020 covers 4-18GHz compared to 1-8GHz for the ADF4108. The ADF41020 is software compatible with the ADF4106/07/08.
External Capacitors

Question What type of external caps is required for charge pump caps and decoupling caps. Answer Small ceramic caps are fine (0603 or 0402 size). COG capacitors are preferred.
Fixed divide-by-4 prescalar

Question Are there any “gotchas” when using the part? Answer With the fixed divide-by-4 prescalar the RF frequency step size is 4x the PFD frequency.
Layout Considerations

Question Are there any layout considerations when designing in this device. Answer The decoupling caps should be placed as close as possible to the device. RF transmission lines are required to carry…
Suitable Reference Sources

Question What reference sources are suitable? Answer This is often determined by the application. But sinusoidal, low noise references such as TCXO’s, or better OCXO’s are recommended. Clock distribution…

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