CC1125 Frequency range

For 205 - 240 MHz the data sheet says "Please contact TI for more information about these frequency bands".

I am looking for a part to design a 25 KHz channel FM link with 4KHz deviation in the 216-225 MHz band. Will the CC1125 be ok or is there another more suitable part?

The CC112x family will be fine for this frequency range and setting.

Regards,

   Richard

I have the CC1120 development kit with CC1120EM 868/915 MHz (EM). I would like to change the operating frequency band to 216-225MHz. How can I design the RF matching circuit for 216-225MHz operation? Is there any guidline or impedance data for the PA and LNA ports of the CC1120?

The data sheet says it supports 205-240MHz. Is there an application schematic for it?

Hi,

Use the 169 MHz schematic as a base for your design.

http://www.ti.com/tool/CC1120EM-169-RD?keyMatch=cc1120emk-169&tisearch=Search-EN

The balun and LPF can be tweeked slightly but the 169 MHz design is a very good starting point.

Regards,   Richard

I have been testing the CC1125 at 230 MHz and altered the BOM for this freq. This BOM will also work for CC120x. I started with testing the 169 MHz BOM http://www.ti.com/tool/cc1125em-169-rd and the CC1120 315 MHz design http://www.ti.com/lit/an/swra398a/swra398a.pdf. Note that if running with the 169 MHz design, you will loose a lot due to the filter. So, the BOM I ended with was this: 

For the TX part I used the 433 MHz/315 MHz reference design BOM, the RX part and filter have the following comp values: L191 100n, L192/L201 68n,C201/ C191 10p,L193 33nH, C181 10p, L173 62n, C175 10p, L174 62n. With this BOM for the CC1125 I did not loose sensitivity nor output power, but the 2nd harm might need some more tuning as this was -25 dBm (15 dBm output power). The other harm were below 50 dBm.

I hope this is enough to get you started. Let me know if anything was unclear.

Thank you very much CHS. I will modify my 868/915 MHz EM as per your suggestions and measure the performance before optimising for my narrow operation band of 216-225 MHz.

Thanks Richard. I see the 169MHz operates up to 192MHz - fairly close to the lower end of my band.