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CC1190 868MHz Reference Design Power Output only 20dBm, missing 5dB

oscar bragado zapatero
Prodigy 40 points
Other Parts Discussed in Thread: CC1190, CC1101-CC1190EM869RD, CC1101

Hello,

We are testing CC1190 RF Booster together with a CC1110 (we have been using CC1110 for a couple of years now). We have designed a PCB based on the 868MHz reference design provided by TI

http://focus.ti.com/docs/toolsw/folders/print/cc1101-cc1190em869rd.html

We have assembled two PCBs and we are only getting in both of them 20dB as Power Amplifier Gain , instead of the 25dB maximum gain that CC1190 should deliver. We are testing our PCBs with a CC1110 design with SMA connector connected with a coaxial cable to the input of our CC1190 PCB and we are measuring directly with an Spectrum Analizer connecting the output of our CC11190 with another SMA and a coaxial cable to the input of our Spectrum Analizer.

With this results the maximum output power we can get from both PCBs (CC1110 + CC1190) is +20dBm.

We have purchased from TI a reference design at 915MHz and this board does deliver the +25dBm we were expecting.

Does anybody know if TI's reference design at 868MHz is limited on purpose to deliver only +20dBm?

The CC1190 Chips we are using are samples that one of our distributors gave us some months ago. This Chips may even be preview units. Could it be that this first Silicon Versions did not deliver 25dBm?

Thanks a lot!

 

 

 

 

 

  • 0
    TI__Mastermind 39860 points

    CC1101+CC1190 869 MHz is designed for operation at +20 dBm. Please refer to app note AN094 available from TI web

    From AN094 front page:

    This application note outlines the expected performance when using a CC1101-CC1190 design under EN 300 220-1 V2.3.1 [4] in the 869.4-869.65 MHz frequency sub-band (g3). The maximum allowed output power in the 869.4-869.65 MHz sub-band is +27 dBm (500 mW), but due to the CC1101 phase noise the maximum output power using the CC1101-CC1190EM 869 MHz reference design [3] is approximately +18 dBm in order to meet modulation bandwidth requirements. The final output power level will depend on the antenna being used.

     

    CC1101+CC1190 915 MHz is designed for +27 dBm output power. Please refer to app note AN096 available from TI web

  • 0 in reply to Sverre
    Prodigy 40 points

    Thanks a lot! We were not sure if the reference design was really limited to deliver +18dBm. All our measures agree with the numbers found on the App Note.

    Best regards!