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TRF7964A: About continuous RF output for RFID testing

NAOKI HORITA
Prodigy 10 points
Part Number: TRF7964A


Hello.
I will use TRF7964A(13.56MHzRFID）. Due to Japanese Radio Law regulations, we need to do some preliminary measurements.
I want to make continuous unmodulated（CW) and pseudo-noise(PN) modulated output for the RF test.

By using the direct mode of TRF7964A, the unmodulated output is possible, but PN modulated output is not.
However, it seems that PN modulation output is not possible.

Please let me know if there is any special setting method.
I am using translation software.

  • 0
    TI__Mastermind 24140 points

    Hello Naoki,

    in direct mode 0 or 1 it is possible to modulate the RF at the MOD pin (pin 14). The direct mode setup is described in the data sheet (https://www.ti.com/lit/gpn/trf7964a), chapter 6.10.6.

    If you need more information then please first let me know more details on the PN modulation signal.

    Best regards,

    Andreas.

  • 0 in reply to Andreas Mueller
    Prodigy 10 points

    Thank you for the information
    About PN modulation signal
    According to the Radio Law of Japan, the modulation source must be a standard coding test signal of PN (Pseudo Random Noise) 9 or PN15 stage according to ITU-T Recommendation O.150.
    I understood that the above modulation output can be obtained by giving PN9/15 signals to pin 14 in direct mode, or by continuously writing the corresponding data to the FIFO. I also understood that there is no way to get the above modulation output only by setting.

    Br, Naoki

  • 0
    TI__Mastermind 24140 points

    Hello Naoki,

    so basically the the PN test signal is a digital bit stream of random content.

    I think the direct mode 0 or 1 is indeed the best solution for this test scenario.

    What was your register setup and what unexpected observation did you see?

    Best regards,

    Andreas.

  • 0 in reply to Andreas Mueller
    Prodigy 10 points

    Before adopting the TRF7964A, we were concerned about whether it had an RF test mode. With your advice, I found out how to use the output for RF test and decided to use the TRF7964A. Thank you very much.