• State
  • Locked Locked
  • Replies 6 replies
  • Subscribers 53 subscribers
  • Views 855 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

CC1000: Replacement device for CC1000 with identical features

Ali Fard
Prodigy 40 points
Part Number: CC1000
Other Parts Discussed in Thread: CC1021, CC1125, CC1120

Hi,

I am looking for a RF transceiver part similar to CC1000. CC1000 is not recommended for new designs according to TI website. The recommended parts are not meeting my requirements. 

I am looking for a pue RF transceiver operating within the range of 920MHz-1050MHz wihtout any specific modulation/demodulation protocol. 

I need to have the RX analog IF outputs so that i can have an external ADC. Also, I need to be able to bypass any internal AGC and set the receiver gain manually.

On the transmitt side I am only looking to generate a CW tone, again no modulation. The transmitter output power is flexible, preferrably in the range of 0dBm.

Almost all the parts I find on TI product portfolio have an internal modulator/demodulator for a specific scheme such as FSK - this is not what I am looking for, I just want to generate a CW tone on the transmitter and receiver it with another identical chip at the above specified frequency span. Is there a part that can comply with my requirements? 
Perhaps the existing FSK chips can bypass the modulator/demodulator and purely work in CW mode?

Please advice.

Thank you,

Ali

  • 0
    TI__Guru**** 317180 points
    For TX all our RX chips can send CW. I believe all our RF products have an internal ADC or similar.

    Why do you want to use an external ADC etc?
  • 0 in reply to TER
    Prodigy 40 points
    I need an external ADC because the dynamic range requirements are high in the product. I would need 90-100dB dynamic range and the idea is to have an external LNA, put the TI receiver in low gain mode (high linearity) and use a 15-bit external ADC (1Mbps sample rate). The IF signal is in the order of 50-100kHz.

    Do you have a part that comes with a high resolution ADC where the TX/RX frequency range is covered that I can send/receive a CW?

    Take for example the CC1021 device, how would you put it in CW mode? Can you extend the operating range from 960MHz to 1050MHz?

    Thanks
  • 0 in reply to Ali Fard
    TI__Guru**** 317180 points
    The ADC on CC1120/ CC1125 has between 80 dB and 90 dB dynamic range. The ADC in the other products we have have lower dynamic range.

    Why do you want to receive a CW and why the extreme dynamic range?
  • 0 in reply to TER
    Prodigy 40 points
    The end application is a biomedical device where the typical path loss (or human body loss) is about 90-100dB. It is an imaging application of the human body with large loss.
    Can you generate a CW and have manual control of the receiver gain in CC1120/CC1125?
  • 0 in reply to Ali Fard
    TI__Guru**** 317180 points
    I still don't understand why a CW and why you need to lock the gain?

    If you look at the datasheet for CC1120/ CC1125 it has a sensitivity of -124 dbm for low datarates meaning that if you send with more than 0 dBm you will still be able to receive the signal with some margin. For receiving a CW you can read out the RSSI value directly.
  • 0 in reply to TER
    Prodigy 40 points
    We cannot have automatic gain control running. The reason for it is that the most vital information received is the reflected phase - having automatic gain control mean that the phase can change when you change the gain of the receiver - especially if you change the gain of the RF front-end.
    The RSSI information is an interpolation of the receiver input power - I need the received raw data so I can calculated the amplitude and phase. The RSSI does not give this information. Also the document for CC1120 barely describes the RSSI (just couple of plots) unfortunately.