RFM31B-868-D QUASAR, RFM31B-868-D Datasheet - Page 35

• Manufacturer Part Number: RFM31B-868-D
• Description: MODULE, RECEIVER, -118DB, 868MHZ
• Manufacturer: QUASAR

Specifications of RFM31B-868-D

• Modulation Type: FSK, GFSK, OOK
• Sensitivity: -121dBm
• Power Supply: 1.8V To 3.6V
• Supply Current: 18.5mA
• Data Rate Max: 256Kbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RFM31B
7. RX Modem Configuration
A Microsoft Excel (WDS) parameter calculator or Wireless Development Suite (WDS) calculator is provided to
determine the proper settings for the modem. The calculator can be found on www.silabs.com or on the CD
provided with the demo kits. An application note is available to describe how to use the calculator and to provide
advanced descriptions of the modem settings and calculations.
7.1. Modem Settings for FSK and GFSK
The modem performs channel selection and demodulation in the digital domain. The channel filter bandwidth is
configurable from 2.6 to 620 kHz. The receiver channel bandwidth is set depending on the data rate and
modulation index via registers 1C–25h. The modulation index is equal to 2 times the peak deviation divided by the
data rate (Rb).
When Manchester coding is disabled, the required channel filter bandwidth is calculated as BW = 2Fd + Rb where
Fd is the frequency deviation and Rb is the data rate.
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