AT86RF211SAHW E2V, AT86RF211SAHW Datasheet - Page 17

• Manufacturer Part Number: AT86RF211SAHW
• Description: IC RF TXRX FSK 400-950MHZ 48TQFP
• Manufacturer: E2V

Specifications of AT86RF211SAHW

• 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-TQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Current - Transmitting: -
• Current - Receiving: -

4.2.9
e2v semiconductors SAS 2008
IF2 Amplifier Chain
The 10 nF capacitors cut the DC response. The first network has the low cut-off frequency and the sec-
ond network the high cut-off frequency.
The input impedance of the IF2 amplifier is 1700Ω. This value permits use of popular filters with an
impedance between 1500Ω and 2000Ω. The IF2 amplifier is directly connected to the FSK demodulator.
The bandwidth is internally limited to 1 MHz to minimize noise entering the discriminator.
The IF2 amplifier acts like a band pass filter centered at 455 kHz with capacitive coupling between the
different stages of the amplifier and mixer. The total voltage gain is typically 86 dB. Thanks to the capac-
itive coupling, no slow DC feedback loop is needed, thus enabling the IF2 amplifier to be activated
rapidly. IF2DEC must be decoupled with at least 2.2 nF.
Figure 4-13. Input of the IF2 Amplifier
IF2DEC
IF2IN
1900 Ω
0894C–WIRE–11/08
AT86RF211S
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