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Question about Bandwidth in AD6688 Datasheet

Thread Summary

The user asked about the full-power bandwidths of 1.2 GHz and 9 GHz for the AD6688. The final answer clarifies that the AD6688 can sample analog signals up to 5 GHz with proper ADC performance, while it can sample up to 9 GHz with reduced performance.
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Category: Datasheet/Specs
Product Number: AD6688

AD6688 Datasheet:1.The AD6688 is a 1.2 GHz bandwidth, mixed-signal, direct radio frequency (RF) sampling receiver.

                                2.Wide full power bandwidth supports IF sampling of signals up to 9 GHz (−3 dB point).

                                3.This product is designed to support communications applications capable of direct sampling wide bandwidth analog signals of up to 5 GHz.

Question:

1.How should we understand the full-power bandwidths of 1.2 GHz and 9 GHz?

2.How can we directly sample an analog signal with a 5 GHz bandwidth?