I am using ad9361. I am facing problem that in vco ldo out, there is no
VOLTAGE it is always zero. ADI provided no os driver is successfully running. In RX VCO it is 0.8V but in TX side it is zero.
What may be the reason?
Are you using eval board or custom board? Can you share the pin from where you are checking the voltage? Share the snippet of the portion of the schematic.
I am using custom board and schematic was copied from fcomms2. I am checking voltage on 1 ohm resistor connected to vco voltage out.
Make sure that the voltage at the VDDA_TX_LO pin is 1.3V. Also readback the register 0x051[d0] and make sure that the LDO is not powered down.
in VDDA_TX_LO is 1.3V and LDO is not power down.
But one thing i have observed. when no os is running i am getting one message that
CALIBRATION TIMEOUT (0x05, 0x80).
What may be reason in hardware coz this software is working in development board. that time calibration time out does not come.
Are you getting a voltage at TX VCO LDO out? Also, check the voltage out on the eval board for comparison. Is the board initializing successfully without any error? Can you check which cal is failing by reading back the register 0x017. Cal fails mainly because of improper matching.