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adrf5721

Topic - Hot Switching limit

In reviewing sheet 4 of the data sheet, it states a max hot switching average level of +24dBm for ATT IN and +15dBm for ATT OUT (bidirectional use). We are assuming that bi-directional use means that a maximum of +15dBm can be applied to both ports simultaneously. Is this assumption correct?

However, on the Absolute max ratings sheet, each level is 1dB higher than stated on sheet 4. Also, for ATTOUT, it doesn't state bi-directional use.

Can you please provide further details on how to interpret the max hot switching limit for each port.

Thanks,

Antonio

  • Hi Antonio,

    Hot switching is defined by having the RF power present while when changing states of the switch/attenuator.
    By bi-directional use, we mean that the RF input power may be applied either to the ATTIN port or the ATTOUT port.
    However, the power handling of the ATTIN port and ATTOUT port is different.
    Therefore, the power recommendations when applying the RF input power to the ATTIN port vs ATTOUT port is also different.

       For example, looking at ADRF5721:
       If applying RF input power to the ATTIN port, we recommend a max of +26dBm average and +30dBm peak under steady state conditions.
       If hot switching, this reduces to +24dBm average and +27dBm peak.

       If the RF input power is applied to the ATTOUT port instead, we recommend a max of +18dBm average and +21dBm peak.
       Under hot switching conditions, this reduces to +15dBm average and +18dBm peak.

    Please also keep in mind the power derating over frequency (Figures 2 and 3 on page 6).
    Stresses at or above what is listed in absolute max rating (AMR) may cause permanent damage to the product.

    Hope this helps clear things up.

    Thanks,
    HK.