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AT86RF211 데이터시트(PDF) 21 Page - ATMEL Corporation

부품명 AT86RF211
상세설명  FSK Transceiver for ISM Radio Applications
PDF  48 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT86RF211 데이터시트(HTML) 21 Page - ATMEL Corporation

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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).
U
I
≅ 18 kΩ
digital
power control
DAC
I
OUT
To ALC
1.25 V
(v)
i
ref=
V
R
POWER
3 bits
R
POWER
Output Power
-2
0
2
4
6
8
10
12
14
26
31
36
41
46
51
56
61
Isupply (mA)
433MHz
868MHz
915MHz



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