Analog Devices ADRV9001 User Manual page 19

Preliminary Technical Data
Functionality Constrains and Limitations
DPD The DPD functionality can be utilized in the 1T1R TDD mode. Maximum channel bandwidth that DPD can support is
imited by ADRV9001 RF bandwidth divided by 3 or by 5. The DPD operation can be performed by ADRV9001 or Rx
data can be sent to baseband processor via Rx data port during Tx operation. Rx path used during DPD operation to
perform Tx observation is also used by the Tx tracking calibrations. In case of external DPD, user has to ensure that
access to the Rx path during Tx slots is time-shared between external DPD operation and Tx calls.
Calibrations During Rx initialization sequence, user needs to ensure that there are no signals present at the Rx input (external LNA
should be disabled) and appropriate termination should be present at LNA output to avoid reflections of Rx
calibration tones. Maximum input signal amplitude should not exceed -82 dBm/MHz for wideband modes, TBD
dBm/MHz for narrowband modes. During Tx initialization sequence user needs to ensure that Power Amplifier is
power down to avoid unwanted emission of Tx calibration tones at the antenna. ADRV9001 needs to access Rx
datapath during Tx time slots for Tx tracking calibration to operate. If user use Tx observation path with DPD
functionality performed by baseband processor then access to the Rx datapath during Tx slots need to be time-
shared between DPD operation and Tx calibrations.
AGPIOs Analog GPIOs (operating at 1.8V level) can be used as read or write digital levels of in the end user system. AGPIOs can
be utilized to control states of external components (e.g. RF Switch) or read back digital logic levels from external
components.
DGPIOs Digital GPIOs can be used to perform real time monitoring of states of internal ADRV9001 blocks. Digital GPIOs
operating as inputs can allow user to control Rx gain, Tx attenuation, AGC operation and other elements of ADRV9001
TRx. Depending on the ADRV9001 operation up to 4 GPIOs may be utilized by data port interface.
AuxADC AuxADC can be used to monitor analog voltage (e.g. temperature sensor). Maximum AuxADC input voltage can not
exceed 0.9V.
AuxDAC AuxDAC can be used to: control VCXO responsible for generating ADRV9001 Device clock, generate pre-configured
ramp up/down signal that can be used to control power amplifier bias, control any circuitry that requires analog
control voltage up to 1.8V.
DEV_CLK_OUT ADRV9001 provides divided down version of DEV_CLK reference clock input signal on the DEV_CLK_OUT output. This
output is intended to provide reference clock signal to the digital components in the overall system. This output can
be configured to be active after power up and before ADRV9001 configuration stage.
Multichip Sync If there is no need for multichip synchronization, ADRV9001 can be initialized using API functions only.
Rev. PrA | Page 19 of 253
UG-1828