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IWR1843: RX gain figure

Pavel Bartoš
Prodigy 70 points
Part Number: IWR1843
Other Parts Discussed in Thread: IWR6843

Tool/software:

Hello,

when reading through the data sheet of IWR1843, we have come across this rx gain graph:



which is exactly the same one as in IWR6843 datasheet:



However we observe completely different behavior behind increasing the rxGain from 30 to 48 on the two chips - IWR6843 and IWR1843.

Do you have any up to date RX gain graph for IWR1843? I highly doubt that the characteristic would be pinpoint the same.

Thank you,

Pavel

  • 0
    TI__Genius 9710 points

    Hi Pavel,

    Please allow me some time till early next week to check this internally and get back to you.

    Regards

    Ankit

  • 0 in reply to Ankit Mohanty
    Prodigy 70 points

    Hi Ankit,

    we have also been able to gain this information from the IWR1843 demo sw:

    /**
         * @brief
                    b5:0  Code for Rx VGA gain\n
                          1 LSB = 1 dB\n
                          Valid values: 
                          For xWR1xxx : all even values from 24 to 52
                          For xWR6x43 : all even values from 30 to 48
                    b7:6  Code for RF gain target (Not applicable for IWR6843 ES1.0, \n
                          RF gain is fixed to 34dB). \n
                          For xWR1243/xWR1443/xWR1642/xWR1843:
                            00 - 30 dB \n
                            01 - 34 dB \n
                            10 - RESERVED \n
                            11 - 26 dB \n
                          For xWR6843 ES 2.0:
                            00 - 30 dB \n
                            01 - 33 dB \n
                            10 - 36 dB \n
                            11 - RESERVED \n
                    b15:8 RESERVED \n
                    In IWR6843 ES1.0 device, Rx Gain is not accurate and not calibrated. \n
                    The RF gain is 34dB and total Rx gain can be varied from 28dB to 56dB \n
         */

    Is it true? Is the Data sheet wrong about range of rxGain for IWR1843?

  • 0 in reply to Pavel Bartoš
    TI__Genius 9710 points

    Thanks Pavel,

    I am still checking these data internally to confirm the exact plot or changes. It might take 48-72 hours to verify this internally.

    Regards

    Ankit

  • +1 in reply to Ankit Mohanty
    TI__Genius 9710 points

    Hi Pavel,

    Thanks for pointing this out. Please find the correct plot for IWR1843 below. We are working towards updating the datasheet within a week.

    Regards

    Ankit