MC33493 Motorola, MC33493 Datasheet - Page 14

• Manufacturer Part Number: MC33493
• Description: PLL tuned UHF Transmitter for Data Transfer Applications
• Manufacturer: Motorola

The 50Ω matching network used for the 868MHz band is similar to the 434MHz, except components values: in
figure 10b, L1 is changed to 8.2nH and C3 to 470pF. The typical gain of this 868MHz matching network is 4dB
compared to unmatched configuration.
COMPLETE APPLICATION SCHEMATIC AND PCB FOR OOK MODULATION
Figure 12 gives a complete application schematic using a Motorola MC68HC908RK2 microcontroller. OOK
modulation is selected, f
software.
Note that for 868MHz band application, the input pin BAND must be wired to ground. See component description
COMPLETE APPLICATION SCHEMATIC AND PCB FOR OOK MODULATION
14
Vbat
B1
Level (dBm)
RFOUT
Figure 12: Application schematic for OOK modulation, 434MHz frequency band
Vbat
-2
-4
-6
8
6
4
2
0
10
1
2
3
4
5
6
7
8
9
6
LED1
R1
750
MC68HC908RK2
PTA0
PTB0/MCLK
PTB1
PTB2/TCH0
PTB4/TCH1
PTB5
PTB3/TCLK
OSC1
OSC2
VSS
carrier
Figure 11: Output power at 434MHz band vs R
Output power measurement in typical conditions (434MHz - Vcc=3V - 25°C)
= 433.92MHz. C
PTA1/KBD1
PTA2/KBD2
PTA3/KBD3
PTA4/KBD4
PTA5/KBD5
PTA6/KBD6
Freescale Semiconductor, Inc.
PTA7
IRQ1
VDD
RST
U2
9
For More Information On This Product,
2.2nF
C2
20
19
18
17
16
15
14
13
12
11
SW1
MC33493 Technical Data
2.2nF
C3
Vbat
100nF
C10
SW1a
Go to: www.freescale.com
2
2.2nF
to C
C4
12
SW2
Output power on 50Ω Ω Ω Ω load (dBm)
5
2.2nF
C5
capacitors can be removed if switches debounce is done by
SW2a
13.56MHz
C6 8.2pF
Rext (kΩ Ω Ω Ω )
15
12K
R2
Y1
Output power when matched (dBm)
-0.35dB/kΩ Ω Ω Ω # -0.35mA/kΩ Ω Ω Ω
1
2
3
4
5
6
7
18
ext
U1
DATACLK
DATA
BAND
GND
XTAL1
XTAL0
REXT
MC33493
value
ENABLE
GNDRF
RFOUT
MODE
CFSK
VCC
VCC
14
13
12
11
10
9
8
REXT SPECIFIED RANGE
21
MOTOROLA
C8
100pF
Vbat
C7
24
22nF
C9
2.2pF