Cc2510 external reference

Hello, somewhere in the data sheet is told that an external reference signal can be applied at CC2510 XOSC-Q1 instead the crystal itself in Q1/Q2.

 

In this case is there any data about the drive level, and input impedance of the external reference input at Q1?

 

We are designing a quadruple reader and I would like to drive 4 CC2510 from a single 26 MHz TCXO, because this way I can synchro perfectly the 4 transceivers, otherwise, I would need 4 independent crystals and apart from the sync, maybe this solution can be more sensitive to RF crosstalks. The TCXO device I plan to use delivers 0.8Vpp on a 10Kohm, 10pF load with DC coupling. I would like to know if this device is suitable to drive 4 CC2510 either directly or using 4way small signal distribution

Thanks in advance

 

Jaime Martin

  • See section 9.4 p 34 in the datasheet:)

     

    charlotte

  • In reply to CHS:

    Please Charlotte in case you are not concerned with this question can you pass this to somebody else. Some changes were decided in this project, one of them is to discard the "powerful" version using the CC2590. All the tags and readers will be based on CC2510 alone. But I wanted to ask you something else, talking with our partners, I suggested that maybe the CC2530 or other members of the chip family are more suitable for an RFID or RF ID/LOC in an interferred environment than the CC2510. But I don't have access to the technical parameters of quality and traffic of our customer to evaluate the needed BER and bitrate. So i just suggested them that DSSS chips like CC2530 can be better because the channel is notably more robust with spread spectrum techniques and CSMA, and if they are using this system to implement some kind of persons or items presence control or data gathering in an open environment where dozens of WiFi or Zigbee or other more robust systems are working i just figured out that the CC2510 is in inferiority, unless they use very wisely the frequency hopping. Certainly, this can be convenient only for high data rate, not to compare the CC2510 at 2.4kbps with the CC2530 at 250kbps. i am not sure because i don't know how much cochannel interference the CC2510 receiver affords, but without FH the system maybe will be blocked below a positive C/I i.e. with interferences lower than the signal. but since Can you give us some idea fof comparison that I can translate to our partners in order to asses them to choose well?

    Thanks in advance

    Jaime Martin

     

     

  • In reply to CHS:

    Thank you, in pg. 9.4 the drive level and AC coupling for sinewaves is specified, but th data shet has nothing about CC2510 clock input impedance.

     

    Ould anybody give some data about it?

     

    Thanks in advance

     

    jaime martin