some questions about ADF5901 and ADF4159

Hi,

i use ADF5901 with ADF4159. But i have two questions about ADF5901. 

1. Does the output power of TX out of ADF5901 can be changed from -20dBm to +8dBm  by change the Tx AMP CAL REF CODE? i connect a amplifier after ADF5901. So I should check this.

2. I think the VCO-CAL  in ADF5901 is useless  when  i use ADF4159 to control the Vtune of VCO in ADF5901. So i want to know how do i set the N-Divider and R-Divider in ADF5901?  

 Because in a PLL,the  N-divider and R-divider i really use is  in PLL just the ADF4159 but not in VCO just the ADF5901.

look forward for your reply.

Parents
  • Hi,

    I have a question to consult obout Tx output power.

     What is the function of REFin in ADF5901? The datasheet shows that it relates to VCO frequency calibration, does it relate to Tx outout power? I use ADF4159 and ADF5901 to get 24GHz , in my PCB board, the REFin pin of ADF5901 is suspended and has no input signal, and the Tx1 output power is still only -16dBm. I wonder the Tx output power is decided by the power of REFin pin and my design is wrong? The register1 of ADF5901 is the amplitude calibration reference code, so the power of REFin pin is the  reference value for TX output amplitude calibration code?

    What is the registers writing order after initialization sequence?  Does the recalibration sequence decide the Tx output power?

    Thank you very much.

Reply
  • Hi,

    I have a question to consult obout Tx output power.

     What is the function of REFin in ADF5901? The datasheet shows that it relates to VCO frequency calibration, does it relate to Tx outout power? I use ADF4159 and ADF5901 to get 24GHz , in my PCB board, the REFin pin of ADF5901 is suspended and has no input signal, and the Tx1 output power is still only -16dBm. I wonder the Tx output power is decided by the power of REFin pin and my design is wrong? The register1 of ADF5901 is the amplitude calibration reference code, so the power of REFin pin is the  reference value for TX output amplitude calibration code?

    What is the registers writing order after initialization sequence?  Does the recalibration sequence decide the Tx output power?

    Thank you very much.

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