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PDF AT86RF211DAI-R Data sheet ( Hoja de datos )
| Número de pieza | AT86RF211DAI-R | |
| Descripción | FSK Transceiver for ISM Radio Applications | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Multiband Transceiver: 400 MHz to 950 MHz
• Monochip RF Solution: Transmitter-Receiver-Synthesizer
• Integrated PLL and VCO: No External Coil
• Very Resistant to Interferers by Design
• Digital Channel Selection
• 200 Hz Steps
• Data Rates up to 64 kbps with Data Clock and no Manchester Encoding Required
• High Output Power Allowing Very Low Cost Printed Antennas:
– +10 dBm in the 915 MHz Frequency Band
– +12 dBm in the 868 MHz Frequency Band
– +14 dBm in the 433 MHz Frequency Band
• FSK Modulation: Integrated Modulator and Demodulator
• Power Savings:
– Stand Alone "Sleep" Mode and "Wake-up" Procedures
– 8 Selectable Digital Levels for Output Power
– High Data Rate and Fast Settling Time of the PLL
– Oscillator Running Mode "Ready to Start"
– Analog FSK Discriminator Allowing Measurement and Correction of Frequency
Drifts
• 100% Digital Interface through R/W Registers Including:
– Digital RSSI
– VCC Readout
Description
The AT86RF211 (aka: TRX01) is a single chip transceiver dedicated to low power
wireless applications, optimized for licence-free ISM band operations from 400 MHz to
950 MHz. Its flexibility and unique level of integration make it a natural choice for any
system related to telemetry, remote controls, alarms, radio modems, Automatic Meter
Reading, hand held terminals, high-tech toys, etc. The AT86RF211 makes bidirec-
tional communications affordable for applications such as secured transmissions with
hand-shake procedures, new features and services, etc. The AT86RF211 can easily
be configured to provide the optimal solution for the user’s application: choice of exter-
nal filters vs. technical requirements (bandwidth, selectivity, immunity, range, etc), and
software protocol (single channel, multiple channel, FHSS). The AT86RF211 is also
well adapted to battery operated systems, as it can be powered with only 2.4V. It also
offers a “Wake Up” receiver feature to save power by alerting the associated micro-
controller only when a valid inquiry is detected.
FSK
Transceiver for
ISM Radio
Applications
AT86RF211
(aka: TRX01)
Rev. 1942C–WIRE–06/02
1
1 page  
AT86RF211
Block Diagram
Figure 4. AT86RF211 Block Diagram
Optional
These are the only blocks that depend
on the selected ISM band (433, 868
or 915 MHz): dual band applications
can be done by only switching them.
Synthesizer, loop filter, IF filter(s),
power supply decoupling are identical.
RF
FILTER
IF1
FILTER
10.7 MHz
or
21.4 MHz
IF2
FILTER
455 kHz
AERIAL
MATCHING
CIRCUIT
TX/RX
LNA MIXER1
Rx GAIN MIN/MAX
IF1
AMP MIXER2
IF2
AMP
FM DISCRIMINATOR
RSSI LEVEL
BANDWIDTH CTRL
TX
PA
RPOWER
PWR
CTRL
SYNTHESIZER
OSC
FREQUENCY
CTRL
CONTROL LOGIC
DATA SLICER
WAKE-UP
10.245 MHz
or
20.945 MHz
DATA DATA SLE SDATA
MSG CLK
SCK
WAKE-UP
OPTIONAL
FILTER
1942C–WIRE–06/02
5
5 Page 
First LNA/Mixer
Figure 10. TEM Filter
1 pF
λ /4
TEM
1 pF
Zc = 7Ω
l = 0.75
(19 mm)
AT86RF211
Such a filter also provides an out-of-band interference rejection greater than 20dB,
40 MHz away from 433 MHz.
The main characteristics of the LNA/Mixer are typically:
• Voltage gain: 17 dB for the LNA/Mixer; 11 dB if gain min. is selected
• Bandwidth: 1.2 GHz
• Noise figure of LNA alone: 3 dB at 900 MHz, best matching
• Noise figure of LNA + mixer:
8 dB at 900 MHz, with maximum gain and best matching
12 dB at 900 MHz, with minimum gain and best matching
• 1 dB compression point: -20 dBm at the input of LNA
• Matching:
Table 2. Matching Information
Frequency Band
RXIN(1)
SWOUT(2)
433 MHz
35 + j 170Ω
24 - j 43Ω
868 MHz
37 + j 85Ω
50 - j 42Ω
915 MHz
30 + j 85Ω
50 - j 42Ω
Notes: 1. RXIN: impedance to be seen by LNA input for NF optimization purpose
2. SWOUT: output impedance of the RF switch
The gain is programmable through bit 25 of CTRL1 register (6dB attenuation when min
gain is selected). The choice for the matching between the SWITCH and the LNA
depends mainly on the chosen SAW filter. Usually in/out impedance of SAW filters is
50Ω, but other ones can be implemented and the matching network recalculated thanks
to the previous impedance table.
The LNA is directly coupled to the first mixer. Input and output of the LNA/Mixer must be
connected through a capacitive link because of their internal DC coupling. A SAW or
ceramic filter provides such a link.
1942C–WIRE–06/02
11
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| PDF Descargar | [ Datasheet AT86RF211DAI-R.PDF ] | |
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