Analog Devices ADRV9001 User Manual page 116

Reference Manual
FREQUENCY HOPPING
At the first hop signal rising edge, the ADRV9001 reads the hop table entry from table A (the single entry) and prepares that frequency for
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the next hopping frame. One PLL starts to retune to this new frequency at the same hop edge. Around the same time, start to load table
B and make sure the loading of table B completes before the hop signal edge when the table B is read (the first falling edge). Note at the
first hop signal rising edge, the ADRV9001 switches to table B, which currently has no frequency information as the loading might not have
completed. Therefore, the ADRV9A001 does not read from table B yet at this point. It reads from table B at the upcoming hop signal edge
(the first falling edge).
At the first falling edge of the hop signal, the ADRV9001 reads the new entry from table B and switches to table A. This hop frame (from the
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first falling edge to the second rising edge) uses the table A entry.
At the next hop edge (the second rising edge) the BBIC should complete loading a new frequency entry into table A. This frame (from
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second rising edge to second falling edge) uses the table B entry. And the process is repeated.
By following this process, the user can provide a new frequency on the fly to the ADRV9001 at each HOP edge.
Note that there is no need to load just a single entry. With the automatic ping pong mode, user can load from 1 to 64 entries. However, ensure
the frame timing length is sufficient to load the table before the automatic switch.
Example 2: Loading a Larger Set of Frequencies with Manual Table Switch
This example, as shown in Figure
the new table. This is like the first example. However it requires an additional Hop Table Select signal to switch to the new table. Configure the
table indexing mode to automatic increment or index by pin.
Load a larger frequency hopping table, which is used in multiple hop frames. Once the table is loaded into the memory, set the Hop Select
DGPIO pin, allowing the ADRV9001 to start reading from the second table at the next Hop edge.
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Figure 109. Load New Frequencies with Automatic Ping Pong with PLL Mux Mode
Figure 110. Loading a Larger Set of Frequencies with Manual Table Switch with PLL Mux Mode
110, demonstrates how to load a larger set of frequencies on the fly, and then use a DGPIO pin to switch to
ADRV9001
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