Frequency Hopping Table - Analog Devices ADRV9001 User Manual

Reference Manual
FREQUENCY HOPPING
The following timing diagram describes the PLL Retune mode.
Figure 105 shows that, with the PLL Retune mode, the same PLL is used (either PLL1 or PLL2). Once the hop frame ends, it starts to retune
to the new frequency. Another major difference from the PLL Mux mode is that the rising edge of Tx_Setup or Rx_Setup before a HOP signal
edge (the start of hop frame n or end of hop frame n-1) indicates if the hope frame n is operated on Tx or Rx instead of n+1. There is no one
frame delay in the PLL Retune mode. In another word, to operate Tx on hop frame n+1, the rising edge should appear at hop frame n.
PLL lock time depends on the PLL reference frequency, which is discussed later.
The four hopping modes, as shown in

FREQUENCY HOPPING TABLE

Hopping Table Definition and Entries
All modes of FH require the use of a frequency hopping table. A frequency hopping table is a list of frequencies and other operational
parameters for each hop frame.
The ADRV9001 supports the loading of two tables (table A and B), each with a minimum length of 1, and a maximum length of 64 entries (a
total of 128 hop entries/frequencies, if two tables are used).
An entry in the frequency hopping table is defined as in
Table 46. Hop Table Entry
Parameter
hopFrequencyHz
rx1OffsetFrequencyHz
rx2OffsetFrequencyHz
rx1GainIndex
rx2GainIndex
Tx1Attenuation_mdB
Tx2Attenuation_mdB
The channel(s) enabled for each hop frame are not known at initialization. Therefore, the hopping table does not present this information.
During FH operation, the BBIC employs the channel setup signals to inform the ADRV9001 on the channel to enable, as described earlier.
Therefore, each entry in the hop table contains parameters for both Rx and Tx, and it only utilizes the relevant parameters based on the
channel setup signals, depending on whether an upcoming hopping frame is operating on Rx or Tx. The irrelevant parameters are ignored.
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Figure 105. PLL Retune Timing Diagram Example
Table 45, also specify the method of loading a hopping table, which is discussed in the following sections.
Table 46.
Descriptions
Operating frequency, in Hz.
The intermediate frequency, if a frame is Rx1.
The intermediate frequency, if a frame is Rx2.
Starting gain index, if frame is Rx1.
Starting gain index, if frame is Rx2.
Starting attenuation level, in mdB, if frame is Tx1.
Starting attenuation level, in mdB, if frame is Tx2.
ADRV9001
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