Hi there 
I’m working with nRF905 right now and the technical reference said that
its " Power supply range is 1.9 to 3.6V “, " current (TX), typical 11mA, (RX), typical 12.5mA”.
So I’m wondering if at any supply voltage the current consumption is the same. If I choose lower supply voltage, will supply current also decrease?
I’m looking forward to your answers. Thanks a lot~
:shock: No reply?!..OMG…
I looked at the datasheet, but I couldn’t see this information.
There is an on-chip regulator that supplies the RF section, so I would assume that the current for this section wouldn’t vary much with supply voltage. The current for the microcontroller section would probably vary almost linearly with supply voltage, since I don’t think it is powered from an internal regulator.
Looks like a nice chip; I’m planning to use Atmel’s AT86RF212 for a project. The Atmel chip doesn’t have onboard microcontroller, but the receive sensitivity is quoted as -110dBm compared with -100dBm for the Nordic part. It’s a bit hard to compare sensitivities though, since companies are a bit coy about providing sensitivity versus data rate information.
:lol: Thanks very much for your useful information. I’ll read the technical reference of the Atmel microcontroller.