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THVD8000: relationship between data rate and carrier frequency?

AnBer
Mastermind 30365 points


Team,

-The datasheet SLLSFD6 at page 4 specifies f0 / 10 for the max data rate.
Does it means that to get a 1 Mbps the carrier f0 need to be set to 5Mhz or do you have to use 10Mhz (which is outside of the supported range)?

How can the data rate be calculated versus the carrier frequency?
Does it requires to test multiple carrier frequency in order to get the wanted data rate? Or is there a formula?

-How long does it takes to switch between TX -> RX and RX -> TX?

Thanks in advance,

A.

  • 0
    TI__Mastermind 25705 points

    A,

    For 1 Mbps data, the corresponding maximum frequency would be 500kHz (010101... pattern). For choosing 5MHz carrier frequency, around 5 cycles show in each bit. In general, any carrier frequency higher than the recommended value would work. However the potential problems are: 1) the carrier frequency could be too high (like you mentioned, out of device's operation range); 2) higher carrier frequency works with less transmission distance due to the cable attenuation.  

    The mode transition time can be found on 6.8 (page 7), which is specified in clocks (carrier frequency dependent).

    Regards,

    Hao