RFM68W Datasheet, PDF (11/20 Pages) List of Unclassifed Manufacturers – Low Cost ISM Transmitter Module

RFM68W
RFM68W
4.5. Frequency Band Coverage
The RFM68W offers several combinations or frequency references and frequency outputs, allowing for maximum flexibility
and design of multi-band products:
Table 7 Frequency Selection Table
Reference
Frequency
FXOSC
Band Setting
DA(13)
Upper / Lower
Frequency
Bounds
22 MHz
310 to 450 MHz
Fstep
Fste p=
22----x_---1---0---⁶_----
2¹⁴
=
1.34277kHz
Frf &
Fdev
24 MHz
0
312 to 450 MHz
Fste p=
24----x_---1---0---⁶_----
2¹⁴
=
1.46484kHz
Frf= DF(18;0) × Fstep
26 MHz
338 to 450 MHz
Fstep= ^{26----x---1---0---6----=} 1.58691kHz ^{Fdev= DA(12;5) × Fstep}
2¹⁴
1
860 to 870 MHz
and
Fstep=
2---6----x_---1---0-⁶_---
2¹³
=
3.17383kHz
902 to 928 MHz
4.6. Power Consumption
The following typical power consumption figures are observed on the RFM68W kits. Note that the transmitter efficiency
depends on the impedance matching quality, and can be PCB design dependant.
The PA matching may be different in each frequency band.
Table 8 Power Consumption in Tx mode
Frequency Band Conditions
310 to 450 MHz
860 to 870 MHz
902 to 928 MHz
Pout=+10dBm, OOK modulation with 50% duty cycle
Pout=+10dBm, FSK modulation
Pout=0dBm, FSK modulation
Pout=+10dBm, FSK modulation
Pout=0dBm, FSK modulation
Pout=+10dBm, FSK modulation
Pout=0dBm, FSK modulation
Typical Current
Drain
11 mA
15 mA
9 mA
16.5 mA
10 mA
17.5 mA
10.5 mA
11
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