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Complete Application Schematic and PCB for OOK Modulation
Figure 11 shows the output power versus the R ext resistor value with 50 Ω load and with matching network.
8
6
Output power measurement in typical conditions (434MHz - Vcc=3V - 25°C)
REXT SPECIFIED RANGE
RFOUT
Level (dBm)
4
2
0
-2
-4
-6
Output power when matched (dBm)
-0.35dB/k Ω # -0.35mA/k Ω
Output power on 50 Ω load (dBm)
6
9
12
15
18
21
24
Rext (k Ω )
Figure 11. Output Power at 434 MHz Band vs R ext Value
The 50 Ω matching network used for the 868 MHz band is similar to the 434 MHz, excepting components values: L1 is changed
to 8.2 nH and C3 to 470 pF in Figure 11 . The typical gain of this 868 MHz matching network is 4 dB compared to unmatched
configuration.
12
Complete Application Schematic and PCB for OOK
Modulation
Figure 12 shows a complete application schematic using a MC68HC908RK2 microcontroller. OOK modulation is selected,
f carrier = 433.92 MHz. The C 2 to C 5 capacitors can be removed if switch debounce is done by software.
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 1.7
14
Freescale Semiconductor
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