• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 16 subscribers
  • Views 745 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CC1200 Transparent mode baseband data format

Pan Hu2
Prodigy 20 points
Other Parts Discussed in Thread: CC1200

Hi,

Is there anyone knows about the output baseband data format of CC1200 in transparent mode? I tried to find it in the datasheet, but the only thing I have is:

In transparent mode CC1200  outputs the digital baseband signal using a digital interpolation filter to eliminate jitter introduced by digital filtering and demodulation", promising 500kBaud data rate in transparent mode.

It would be great if I can have a definition of the data format. Your help is appreciated, Thanks,

-Pan

  • 0
    TI__Guru**** 317180 points
    Not sure if I understand your question. In transparent mode the RF signal is mixed down and if the deviation is above 0 a '1' is output on a pin, otherwise '0'. Basically it's the raw demodulated data without extra filtering.
  • 0 in reply to TER
    Prodigy 20 points
    Hi TER,

    Thank you for your prompt reply. I think there are two modes if you want to get the demodulated data:
    1. In synchronous serial mode, it is what you've said. I got '1's and '0's at 10kbps if I was transmitting at 10kbps.
    2. In transparent serial mode, I can see very high data rate signal (~1Mbps) and I think this is "filtered digital baseband", some sampled IQ data directly comes from the ADC. I assume that this is different from the raw demodulate data after the demodulator and comparator.

    Please let me know if you think my description is unclear and I truly appreciate your help.

    Thanks,
    -Pan
  • 0 in reply to Pan Hu2
    TI__Guru**** 317180 points
    No, if you have a 10 kbps signal this is a 10 kbps signal both for synchronous serial mode and transparent mode.

    If you get 1 Mbps you either don't use transparent mode or see jitter. Please provide register settings and a plot showing what you are seeing.