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CC1120+CC1190 with TPS62730 Power Requirements

Dakotah Karrer
Prodigy 65 points
Other Parts Discussed in Thread: CC1190, CC1120, TPS62730

Howdy,

Generating a design to use the CC1120+CC1190 for sub-1GHz wireless communication and have a question about power requirements.

There are multiple reference designs and recommendations to use the TPS62730 step down converter to power the CC1120 and allow it to operate in a low power state. According to the datasheet the CC1120 has a max output power of +14dBm but we will be using an output power of +10dBm to interface with the CC1190. The datasheet specs the CC1120 at 34mA TX current @ +10dBm and a peak RX current of 22mA. The TPS62730 has a max output current of 100mA which is fine for this application.

However, to get the desired output power of +27dBm we need to use the CC1190 in conjunction with the CC1120. The CC1190 has a receive current of 3mA but a TX current of 302mA at +27dBm. This is over the spec of the TPS62730.

Questions: Can I still use the TPS62730 on the CC1120 only and power the CC1190 with a differnt 3.3V source? Or is it best to totally avoid the TPS62730 and use the same 3.3V source for both the CC1120 and CC1190. If I use the TPS62730 on only the CC1120 will this affect performance?

Regards,

Dakotah 

 

  • 0
    TI__Mastermind 39860 points
    You can connect TP62730 to CC1120 only and supply CC1190 from a different 3.3V supply. CC1120 performance will not be affected by the TPS62730. Note that the CC1120 SPI and GDO signals will be at the same level as the TPSS62730 output so make sure the interfacing MCU also runs off 1.8V. The CC1190 control lines work will work fine with 1.8V logic.