Additional Frequency Hopping Operations - Analog Devices ADRV9005 Reference Manual

Reference Manual
FREQUENCY HOPPING
Minimum FH Frame Timing
As per Table 48 and Table 54, the minimum frame timing can be achieved by using:
PLL Mux with hop table preprocess mode
►
300 MHz device clock (Max PFD is actually 307.2 MHz which could produce marginally faster retune time)
►
1200 k loop filter bandwidth.
►
The above figure shows a strategy to allow for the minimum frame timing. As detailed previously, the minimum PLL retune time is 16.1 µs as
per Table 54. As mux mode uses two PLLs that are switched between, only one PLL needs to be active at a time. Furthermore, the PLL only
needs to be tuned for one dwell time, as shown. The remainder of the time, both PLLs can be retuning for upcoming frames. In practice, this
means that a PLL can take 1 dwell time and 2 transition times to retune. The time needed for transition and dwell timing is user defined. Using
this strategy, the minimum frame time can be reached.
Note: in 'mux with hop table preprocess' mode, t

ADDITIONAL FREQUENCY HOPPING OPERATIONS

Receiver Only with Long Propagation Delay
The ADRV9001 supports the scenario when Rx propagation delay is greater than the duration of a hopping frame. This, however, is only
supported with the Rx-only modes. The Tx-only mode is described in the next section.
To achieve this, set the timing parameter, enableHoldDelay, to the propagation delay to keep the Rx datapath and interface on after the hopping
frame, or a series of hopping frames, has ended on air.
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Figure 124. Minimum Frame Timing Strategy
is not part of the frame time as this processing is done at the initialization stage.
FHProcessing
Figure 125 shows an example timing diagram with the PLL Mux mode.
ADRV9001
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