AT86RF211SAH-R Atmel, AT86RF211SAH-R Datasheet - Page 25

• Manufacturer Part Number: AT86RF211SAH-R
• Description: IC RF TXRX FSK 400-950MHZ 48TQFP
• Manufacturer: Atmel

Specifications of AT86RF211SAH-R

• Frequency: 400MHz ~ 950MHz
• Data Rate - Maximum: 100kbps
• Modulation Or Protocol: FSK
• Applications: ISM
• Power - Output: 7dBm ~ 12dBm
• Sensitivity: -107dBm
• Voltage - Supply: 2.4 V ~ 3.6 V
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-TQFP Exposed Pad, 48-eTQFP, 48-HTQFP, 48-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -
• Current - Transmitting: -
• Current - Receiving: -

Transmitter Description
2.2.13
Figure 2-21. Output Matching of the Power Amplifier
5348B–WIRE–03/06
Power Amplification
Vcc
PA Output
Power Supply
Filtering
RF
The Power Amplifier has been built to deliver more than 14 dBm (25 mW in the three
most common frequency bands). This power level is intended to be measured on the
aerial port with a correct output matching network. Note that correct calculation of the
matching network guarantees optimal power efficiency.
Figure 2-20. Output of the Power Amplifier
The PA must be correctly matched to deliver the best output power and current con-
sumption. Figure 2-21 gives an example of the typical recommended output network in
the
868 MHz band.
Note:
This network has the benefit of filtering the output signal’s harmonic levels; hence it can
be designed to meet a particular regulation.
It is mandatory to implement low impedance grounding techniques. Excessive inductor
values to ground can not only limit the PA output voltage swing, but can also trigger RF
instability. Board design is vital to avoid parasitic loss when a high output power is
needed (a direct short connection to a single low impedance ground plane).
1.5 nH
A
The filter is designed to meet relevant regulations. Refer to the Application Note
“AT86RF211S FSK Transceiver for ISM Radio Applications - RF BOM vs. Application
Requirements” reference 5305, for details.
50Ω
Supply Inductor:
18 nH at 433 MHz
12 nH at 868 MHz
10 nH at 915 MHz
C0
L1
~ 50Ω Matched Filtering
C1
L2
C2
C3
AT86RF211S
Aerial
25