AX8052F131 datasheet(13/46 Pages) ONSEMI

13 / 46 page

Specifications

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AX8052F131

Note on current consumption in TX mode

To achieve best output power the matching network has to be optimized for the desired output

power and frequency. As a rule of thumb a good matching network produces about 50% efficiency

with the AX8052F131 power amplifier although over 90% are theoretically possible. A typical

matching network has between 1 dB and 2 dB loss (Ploss).

The current consumption can be calculated as

ITX[mA]=1/PAefficiency*10^((Pout[dBm]+Ploss[dB])/10)/2.5V+Ioffset

Ioffset is about 12 mA for the VCO at 400-470 MHz and 11 mA for 800-940 MHz. The following table

shows calculated current consumptions versus output power for Ploss = 1 dB, PAefficiency = 0.5 and

Ioffset= 11 mA at 868 MHz

Pout [dBm]

I [mA]

13.0

13.2

13.6

14.0

14.5

15.1

16.0

17.0

18.3

20.0

22.0

24.6

27.96

32.1

37.3

43.8

The AX8052F131 power amplifier runs from the regulated VDD supply and not directly from the

battery. This has the advantage that the current and output power do not vary much over supply

voltage and temperature from 2.55 V to 3.6 V supply voltage. Between 2.55 V and 2.2 V a drop of

about 1 dB in output power occurs.

AX8052F131 Datasheet(PDF) 13 Page - ON Semiconductor