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ADF4159 AUX Power

Thread Summary

The user inquires about using ADF5901 and ADF4159 in single-ended mode, specifically whether the -5 dBm output of ADF5901 meets the -10 dBm minimum input requirement of ADF4159. The support engineer confirms that the -10 dBm minimum input is for single-ended configuration, and the -5 dBm output is sufficient. It is recommended to follow the reference design on the EVAL-RADAR-MMIC evaluation board.
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Category: Hardware
Product Number: ADF4159

If I intend to design an FMCW radar using ADF5901 and ADF4159, and I only want to use the AUX and RFINA in single-ended mode for connection, is this feasible? In this case, should the corresponding complementary AUX be left floating, and RFINB be grounded through a capacitor? Additionally, the datasheet of ADF5901 indicates that its AUX single-ended output is typically -5 dBm. However, for ADF4159, the minimum input of RFIN is -10 dBm, and it is not specified whether this is for single-ended input. Therefore, I would like to confirm whether the -10 dBm here refers to the minimum value for single-ended input; if so, the single-ended output of -5 dBm would meet the requirement.

  • Hi, 

    Yes, minimum value is defined in single ended configuration. You can use ADF4159 and ADF5901 in single ended configurations. However, we recommend following recommended reference design given in the EVAL-RADAR-MMIC evaluation board. 

    Thanks,

    Emrecan

  • Thank you very much for your reply. Let me explain the situation. Actually, I intend to use a non-chip with the ADF4159 for FMCW radar design. Since this chip comes in a BGA package, it is not easy to route one of the pins of the DIV internally. Therefore, I want to connect it to the ADF4159 in a single-ended manner, which is why I consulted the similar case of the 5901 and the 4159.
    The single-ended output of this new chip is -6dBm, so I would like to confirm whether the minimum input of the ADF4159 is single-ended. Based on your explanation, such a connection should be correct. The single-ended output of the 5901 is -5dBm, which is similar to that of my new chip, and both fall within the -10dBm requirement for the single-ended input of the ADF4159. The other end of the ADF4159 is connected to GND via a capacitor.
  • Yes, minimum value is defined in single ended configuration. You can use ADF4159 and ADF5901 in single ended configurations. However, we recommend following recommended reference design given in the EVAL-RADAR-MMIC evaluation board. 

    can you help me with my real situation? Thanks!