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RF68

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4.5. Frequency Band Coverage

The RF68 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

Fstep

Frf &

Fdev

22 MHz

310 to 450 MHz

22x10

6

Fstep= -----------------= 1.34277kHz

2

14

24 MHz

312 to 450 MHz

24x10

6

Fstep= -----------------= 1.46484kHz

2

14

0

338 to 450 MHz

26x10

6

Fstep= -----------------= 1.58691kHz

2

14

26 MHz

1

860 to 870 MHz

and

902 to 928 MHz

6

Fstep=

2---6----x---1---0----= 3.17383kHz

2

13

Frf= DF(18;0) × Fstep

Fdev= DA(12;5) × Fstep

4.6. Power Consumption

The following typical power consumption figures are observed on the RF68 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

Typical Current

Drain

310 to 450 MHz

Pout=+10dBm, OOK modulation with 50% duty cycle

Pout=+10dBm, FSK modulation

Pout=0dBm, FSK modulation

11 mA

15 mA

9 mA

860 to 870 MHz

Pout=+10dBm, FSK modulation

Pout=0dBm, FSK modulation

16.5 mA

10 mA

902 to 928 MHz

Pout=+10dBm, FSK modulation

Pout=0dBm, FSK modulation

17.5 mA

10.5 mA