Analog Devices ADRV9002

Preliminary Technical Data UG-1828
Rev. PrB | Page 101 of 277
24159-500
DWELL
DWELL
Rx1/2
FRAME
Rx1/2
FRAME
TRANSITION
TRANSITION
DWELL
TRANSITION
HOP
Rx1 SETUP
Rx2 SETUP
t
Rx1/2Prepare
t
Rx2RiseToOn
t
Rx1RiseToOn
t
Rx1RiseToOn
t
Rx1/2Prepare
t
Rx2RiseToOn
Figure 104. Diversity Timing Example, Rx1/Rx2
FREQUENCY HOPPING WITH RX/ORX GAIN CONTROL
In frequency hopping operation, the user can configure the Rx gain control to either be manual gain control, or AGC slow loop.
The user can configure the AGC as in non-FH mode.
When configuring the AGC, the user can either set the AGC to either be reset at the start of each Rx frame to a starting gain index, or to
continue from the previous Rx frame.
AGC Configuration
In the ADRV9001, the AGC configuration has the following field,
resetOnRxOn
If the user desires the AGC to continue from the previous Rx frame, they should set resetOnRxOn to false. If they want the AGC to reset
to a starting gain index each frame, they should set resetOnRxOn to true.
In frequency hopping, if the AGC is configured and the resetOnRxOn field is true, then the starting Rx gain for each frame will be taken
from the frequency hopping table (see Frequency hopping table section) not from the resetOnRxonGainIndex field in the AGC
configuration.
Manual Gain Control
In this mode, ADRV9001 will program the manual gain index for each frame based on the gain information in the frequency hopping
table (see Frequency hopping table section).
ORx Gain Control
The ORx gain operates in manual gain control. In this mode, the user should set their desired starting gain index prior to enabling ORx.
They can update the gain throughout the ORx frame.
FREQUENCY HOPPING TES EXAMPLES
Here we show two examples of utilizing TES to achieve frequency hopping for ADRV9001.
Example 1: Manual Frequency Hopping
In this mode user does not need to specify timing. In most cases, this is a mode to help users understand how frequency hopping
operates in ADRV9001. Here we use DMR profile as an example. Other profiles are largely the same.
In this example we will show frequency hopping for Tx only Rx only and TRx.
1. Connect.
2. Go to Carriers tab on the left pane.
3. Select Frequency Hopping under Carrier Configuration Mode.
The first three steps are the same for Automated TDD Frequency Hopping as well.