Preliminary Technical Data
UG-1828
Rev. PrC | Page 107 of 338
Table 37. Channel Selection
Channel Use
Case
Profile Propagation Delay Requirements
Number of
Channels
Selectable Mode
TRx
Propagation delay must be less than the duration of a single hop
frame.
1T1R
All modes
2T2R
LO mux with hop table
real time update
LO retune with hop
table real time update
Rx
Propagation delay can be greater than the duration of a hop
frame.
1R
All modes
2R
LO mux with hop table
real time update
LO retune with hop
table real time update
Tx
Propagation delay can be greater than the duration of a hop
frame.
1T
All modes
2T
LO mux with hop table
real time update
LO retune with hop
table real time update
FREQUENCY HOPPING OPERATION RANGES
Operation Ranges
•
The full Rx gain range available in regular mode is supported in frequency hopping mode.
•
The full Tx attenuation range available in regular mode is support in frequency hopping mode.
FREQUENCY HOPPING TABLE
Hopping Table Definition and Entries
All modes of frequency hopping require the use of a frequency hopping table. A frequency hopping table is a list of frequency and other
operational parameters for each hop frame. At initialization, the user will provide ADRV9001 a frequency hopping table, as well as the
number of entries, or frequencies, within that table.
ADRV9001 supports the loading of two tables (table A and table 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 loaded).
An entry in the frequency hopping table is defined as follows.
Table 38. Hop Table Entry
Parameter
Descriptions
hopFrequencyHz
Operating frequency, in Hz.
rx1OffsetFrequencyHz
rx2OffsetFrequencyHz
The intermediate frequency, if a frame is Rx.
rxGainIndex
Starting gain index, if frame is Rx.
TxAttenuation_mdB
Starting attenuation level, in mdB, if frame is Tx.
The channel(s) which will be enabled each hop frame is not known at initialization. During frequency hopping operation, the user will
use the channel setup signals to inform ADRV9001 on which channel to enable. Therefore, each entry in the hop table contains
parameters for both Rx and Tx and it processes the entry appropriately, depending on whether an upcoming hop frame is operating on
Rx or Tx.
Note there will be examples provided in the TES. And the ranges of the fields should be the same as non-frequency hopping mode.
Frequency Hopping Table Modes
ADRV9001 supports utilizing the frequency hopping tables in several different ways. This section details the available methods of
updating, indexing, and switching between frequency hopping tables.
During operation, an entry in the table is read at the channel setup rising edge. Therefore, like the channel information, the hop entry is
read one hop frame in advance. This gives time to prepare the channel and retune the LO.
Automatic Increment
The standard mode of operation in ADRV9001 is automatic increment mode. In this mode, frequency hopping begins at index 0, and
continues to iterate over the table until the number of table entries has been reached. Once reached, it wraps back around to index 0.
