Analog Devices ADRV9005 Reference Manual page 134

Reference Manual ADRV9001
FREQUENCY HOPPING
Figure 126. Tx Only with Long Propagation Delay for PLL Mux Mode
For the PLL Retune mode, the difference is the transmitter setup rising edge, which now marks the beginning of the interface. "txAnalogPower-
OnFrameDelay" starts to decrease when the hop signal first samples a High of transmitter setup signal, until it is decreased to 0. When
reaching 0, the transmitter analog is powered on as there is no 1 frame delay in the PLL Retune mode. The value remains 0 until the transmitter
is sampled with low, and the value is then set back to the original value.
Figure 127. Tx Only with Long Propagation Delay for PLL Retune Mode
Transmitter Only with Short Propagation Delay
There is a restriction to how long before the hop edge the transmitter setup falling edge must come. For profiles with very short propagation
delays, this means the interface is on longer than required for valid data to reach the analog front end.
Figure 128 shows one option to pad the data with zeros or a known pattern and start transmitting as soon as the interface is enabled. This way,
although the interface is on earlier, the transmitted data is a known pattern when it reaches the analog front end.
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