Analog Devices ADRV9001 User Manual page 90

Reference Manual
MICROPROCESSOR AND SYSTEM CONTROL
Default Timing Parameters for Receiver Channels
Figure 79 shows the ADRV9001 receiver's required timing parameters and their minimum, maximum, and default values.
some recommendations.
Table 35. User Provided Receiver Timing Parameters
Timing Parameter
enableRiseToAnalogOnDelay
(t )
RxEnaRise2AnaOn
enableRiseToOnDelay (t )
RxEnaRise2On
enableGuardDelay
(t )
RxGT
(not used currently)
enableFallToOffDelay (t )
RxEnaFall2Off
(not used currently)
enableHoldDelay
(t )
RxEnaHold
When the ADRV9001 calculates the default values, it uses the transmit/receive propagation delay internally characterized for different profiles.
Measure the propagation delay for the entire system to determine all the required timing parameters accurately. This includes a power amplifier,
LNA, filters, and anything else that might be between the chip and antenna. During the measurement, set all the timing parameters as the
default values for simplification, and it is also important to use the same profile and configurations as the actual application being deployed.
An example of measuring the receive propagation delay: A typical system level measurement can be done with an RF switch controllable from
the BBIC. Switch off the switch and turn on the receiving signal and switch on the switch and start recording data from the interface. This signal
can be a pattern from a signal generator with an external sync. Then the BBIC can use the external sync to start recording and obtain a very
accurate measurement.
After calculating all the timing parameters required by the ADRV9001, configure them through TES, as shown in
analog.com
Figure 79. Receiver Timing Parameters
Min Value
Max of the following values: 0, t
PowerUpPSM
(for the maximum intended power savings
mode)
enableRiseToAnalogOnDelay +
enableSetupDelay
0
0
enableFallToOffDelay
Max Value Comment
91 ms/scaleFactor Default = min
91 ms/scaleFactor
Default = min
Not needed if not controlling LNA power.
91 ms/scaleFactor
Default = min
Can increase if performance degradation is ob-
served, and the channel is receiving for some time
before the start of the actual frame (forced to 0
currently by the ADRV9001).
91 ms/scaleFactor
Default = min
Can increase if performance degradation is ob-
served, and the channel is receiving for some time
after the end of the actual frame. Can still be used if
not controlling LNA power- down (forced to 0 current-
ly by the ADRV9001).
enableFallToOffDelay +
Default = max
propagationDelay
Can decrease if not all data received on air must be
sent over the interface.
ADRV9001
Table 35 summarizes
Figure 80.
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