Analog Devices ADRV9001 User Manual page 192

Reference Manual ADRV9001
RECEIVER GAIN CONTROL
Figure 167. TES Configuration for Rx Gain Control Mode and Signal Detector Operation Mode
After configuring the Gain Control Mode and Detection Mode, further configure the interface gain, signal detection parameters, and manual
control parameters under the Gain Control tab in the TES, as shown in Figure 168 , Figure 169, and Figure 170.
The interface gain control parameters shown in Figure 168 are previously discussed. Choose the Manual or Automatic receiver interface gain
control mode and the associated parameters. When the Manual mode is selected, further enter the desired interface gain value. Note that the
interface gain range relates to the selection of the gain table. First select the receiver gain table type. In both modes, configure when the gain
update should take effect. Also configure the RSSI related parameters and choose if the fast attack mode should be enabled. In the Automatic
mode, further configure the Max Signal Level Target, Peak-to-Average Ratio of Applied Signal and Seed/Save Gain Value by specifying a
GPIO pin.
For signal detection parameters shown in Figure 169, configure the signal detection parameters such as Peak Overload Threshold, Peak
Underload Threshold (they apply to both APD and HB detectors), Overload Gain Step, Underload Gain Step, Gain Refresh Period, Max
Gain Index, and Min Gain Index when the Peak Only mode is selected. Note that some selections are grayed out as they are not applicable in
the selected modes. For example, Power Overload Threshold and Power Underload Threshold are only applicable for the Peak and Power
mode. The TES provides sanity checks for the entered parameters so when the value is out of range, the user input is not allowed.
There are several additional configurations:
1. Freeze the signal detection using a specified GPIO pin. If this pin is high during the Automatic mode, it freezes signal detections. So, Rx
gain is not changed regardless of the input Rx signal level.
2. Enable the "lowThreshPreventGainInc" functionality, as discussed previously.
3. Freeze the Rx QEC algorithms when overload happens.
4. Enable the HB detector (if not selected, it is disabled on both the detection modes).
5. Reset the Rx gain index when Rx is enabled.
For the manual control parameters shown in Figure 170, if MGC SPI is configured, further configure other parameters such as the Manual Gain
Index. With the MGC Pin mode, configure the Increment Step Size and Decrement Step Size.
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