AT86RF212 Atmel Corporation, AT86RF212 Datasheet - Page 123

• Manufacturer Part Number: AT86RF212
• Manufacturer: Atmel Corporation

Specifications of AT86RF212

• Max. Operating Frequency: 0 MHz
• Crypto Engine: AES
• Operating Voltage (vcc): 1.8 to 3.6
• Frequency Band: 700/800/900MHz
• Max Data Rate (mb/s): 1
• Antenna Diversity: No
• External Pa Control: Yes
• Power Output (dbm): 10
• Receiver Sensitivity (dbm): -110
• Receive Current Consumption (ma): 9.0
• Transmit Current Consumption (ma): 18 at 5dBm
• Link Budget (dbm): 120

7.8 Frequency Synthesizer (PLL)
7.8.1 Overview
7.8.2 RF Channel Selection
8168C-MCU Wireless-02/10
The main PLL features are:
• Generate RX/TX frequencies for all supported channels
• Autonomous calibration loops for stable operation within the operating range
• Two PLL interrupts for status indication
• Fast PLL settling to support frequency hopping
The PLL generates the RF frequencies for the AT86RF212. During receive and transmit
operations, the frequency synthesizer operates as a local oscillator. The frequency
synthesizer is implemented as a fractional-N PLL with analog compensation of the
fractional phase error. The VCO is running at double of the RF frequency. Two
calibration loops ensure correct PLL functionality within the specified operating limits.
The PLL is designed to support
• one channel in the European SRD band from 863 to 870 MHz at 868.3 MHz
• 10 channels in the North American ISM band from 902 to 928 MHz with a channel
• 4 channels in the Chinese WPAN band from 779 to 787 MHz with a channel spacing
Additionally, the PLL supports all frequencies from 769 to 935 MHz with 1 MHz
frequency spacing and 3 bands with 100 kHz spacing from 769.0 to 794.5 MHz, 857.0
to 882.5 MHz, and 903.0 to 928.5 MHz.
The frequency is selected by register bits CC_BAND of register 0x14 (CC_CTRL_1)
and register bits CC_NUMBER of register 0x13 (CC_CTRL_0). Table 7-35 shows the
settings of CC_BAND and CC_NUMBER.
Table 7-35. Frequency Bands and Numbers
CC_BAND
according to IEEE 802.15.4-2003/2006 (channel k = 0)
spacing of 2 MHz according to IEEE 802.15.4-2003/2006. The center frequency of
these channels is defined as
where k is the channel number ranging from 1 to 10.
of 2 MHz according to IEEE 802.15.4c-2009. Center frequencies are 780, 782, 784,
and 786 MHz.
6, 7
0
1
2
3
4
5
CC_NUMBER
Not used
0 – 255
0 – 255
0 – 255
0 – 102
0 – 255
0 – 94
Description
European and North American channels according to IEEE
802.15.4-2003/2006; Frequency selected by register bits
CHANNEL (register 0x08, PHY_CC_CCA), refer to section
7.8.6
769.0 – 794.5 MHz; F
857.0 – 882.5 MHz; F
903.0 – 928.5 MHz; F
769 – 863 MHz; F
833 – 935 MHz; F
Reserved
F = 906 + 2⋅(k-1) [MHz]
c
c
c
[MHz] = 769 + CC_NUMBER
[MHz] = 833 + CC_NUMBER
c
c
c
[MHz] = 769.0 + 0.1 · CC_NUMBER
[MHz] = 857.0 + 0.1 · CC_NUMBER
[MHz] = 903.0 + 0.1 · CC_NUMBER
AT86RF212
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