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AWR2243: Power-On Hours (POH) Specification vs Duty Cycle

David Wu2
Prodigy 120 points
Part Number: AWR2243
Other Parts Discussed in Thread: AWR1843, IWR1642

The AWR2243 and AWR1843 datasheets both specify POH as the following:

1. Is 100% duty cycle defined as continuous-wave transmission (i.e. no chirp idle time)?
2. What kind of POH can we expect at 50% duty cycle for both AWR2243 and AWR1843 (accounting for chirp idle time)?
3. Is it correct that the IC has lower lifetime at 75C Tj compared to 95C Tj?

4. What is the degradation criteria that limits POH? Will the chip still function with degraded performance (e.g. SNR, TX power, etc)?
5. For comparison, IWR1642 specifies 50% duty cycle POH as the following (100,000 hours at 50% duty cycle, 85C Tj). Is this performance representative of other TI radar sensors with the same 45nm RFCMOS technology?


Thanks,

David

  • 0
    TI__Guru 69960 points

    Hello David,

    There is similar thread on this topic, hope that would help you here.

    https://e2e.ti.com/support/sensors/f/1023/t/875913

     

    Regards,

    Jitendra

  • 0
    TI__Guru 58035 points

    Hello David,

    Please find my answers below:

    1. Is 100% duty cycle defined as continuous-wave transmission (i.e. no chirp idle time)?

    <VD> That is correct. This assumes the active chirp time alone.


    2. What kind of POH can we expect at 50% duty cycle for both AWR2243 and AWR1843 (accounting for chirp idle time)?

    <VD> With 50% duty cycle the POH will double since at this point it is limited by the analog/RF turn on time.


    3. Is it correct that the IC has lower lifetime at 75C Tj compared to 95C Tj?

    <VD> The table does not indicate a life time at a specific temperature. It represents a usage profile across the whole -40C to 125C temperature range. The usage assumes 6% usage at -40C , 20% at 75C, 60% at 95C and 9% at 125C. In general more usage at higher temperature will reduce the POH.

    4. What is the degradation criteria that limits POH? Will the chip still function with degraded performance (e.g. SNR, TX power, etc)?

    <VD> The transister FIT (Failure in time) analyses govern the POH. The exact type of failure cannot be predicted.


    5. For comparison, IWR1642 specifies 50% duty cycle POH as the following (100,000 hours at 50% duty cycle, 85C Tj). Is this performance representative of other TI radar sensors with the same 45nm RFCMOS technology?

    <VD> yes, this is same 45nm RFCMOS technology.

    Regards,

    Vivek