Analog Devices ADRV9001 User Manual page 25

Preliminary Technical Data
Functionality Constrains and Limitations
RF Front End For LO generation, ADRV9001 utilize internal VCO that generates square wave type signal. A square wave LO would
produce harmonics. For example: depending of RF matching used on the RF ports user 2nd LO harmonic can be as
high as -50dBc and 3rd harmonic can be as high as -9 dBc. Therefore the RF filtering on the Rx and Tx path must
ensure that signals at the LO harmonic frequencies (up to 9th in some cases) are not affecting overall system
performance.
DPD The DPD functionality is not available when ADRV9001 operates in 2R2T FDD mode.
Calibrations During Rx initialization sequence user needs to ensure that there are no signals 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.
No Tx tracking calibrations are available when ADRV9001 operates in 2R2T FDD mode.
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 or read back digital logic levels from external components.
DGPIOs Unused in this application example.
AuxADC can be used to monitor analog voltage (e.g. temperature sensor). Maximum AuxADC input voltage cannot
AuxADC
exceed 0.9V.
AuxDAC AuxDAC can be used to 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.
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UG-1828