AT86RF211DAI-R datasheet(21/48 Pages) ATMEL

21 / 48 page

AT86RF211

1942C–WIRE–06/02

An automatic level control loop (ALC) is integrated, in order to minimize the sensitivity of

the PA to the temperature, process and power supply variations. For instance, at +85°C,

the output power is about 2 dB less than at 25°C. At -40°C, the output power is higher

than at 25°C. The ALC is controlled by a current which is generated in the following way:

Figure 26. ALC of the Power Amplifier

Figure 27. Typical Output Power of the PA for T = 25°Cand V

CC =3V

Hardware Control

The max output power is determined by R

POWER and the maximum output power is

obtained with R

POWER =10kΩ.

18 k

Ω is the nominal value for a +10 dBm output in the 868 MHz frequency band.

Decreasing this value to 10 k

Ω will lead to +14 dBm at 433 MHz, +12 dBm at 868 MHz,

+10 dBm at 915 MHz (typical values for conducted output power).

≅ 18 kΩ

digital

power control

DAC

OUT

To ALC

1.25 V

(v)

ref=

POWER

3 bits

POWER

Output Power

-2

Isupply (mA)

433MHz

868MHz

915MHz

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