MC33493 Motorola, MC33493 Datasheet - Page 15

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

on following tables 3 and 4.
Examples of crystal reference are given below (see characteristics on table 4) for different application bands:
Figure 13 shows a two buttons keyfob board. Size is 30 x 45 millimeters.
COMPLETE APPLICATION SCHEMATIC AND PCB FOR FSK MODULATION
Figure 14 gives a complete application schematic using a Motorola MC68HC908RK2 microcontroller. FSK
modulation is selected, f
software.
Note 3: C6 value equals recommended crystal load capacitance reduced by the PCB stray capacitances.
Motional capacitance
Static capacitance
Load capacitance
Loss resistance
- at 315MHz band (f
- at 434/868MHz bands (f
MOTOROLA
Parameter
Component
NDK NX8045GB/CSJ S1-40125-8050-12 and NDK NX1255GA.
R2
C6
C7
C8
Y1
carrier
reference
Table 4: Typical crystal characteristics (SMD package)
NDK LN-G102-950
Table 3: External components description for OOK
Power supply decoupling
RF output level setting
Crystal load capacitor
(for 315MHz)
= 433.92MHz. C
reference
COMPLETE APPLICATION SCHEMATIC AND PCB FOR FSK MODULATION
Figure 13: Two buttons keyfob board layout
= 9.84375MHz, -40°C < T
Freescale Semiconductor, Inc.
resistor (R
3.33
1.05
see table 4
12
28
capacitors
Function
For More Information On This Product,
Crystal,
= 13.56MHz, -40°C < T
ext
Go to: www.freescale.com
MC33493 Technical Data
)
1
(for 434MHz & 868MHz)
capacitor can be removed if switch debounce is done by
NDK NX8045GB/CSJ
S1-40125-8050-12
A
18.5
4.4
1.5
12
< 85°C): NDK LN-G102-950,
A
434MHz band: 13.56
868MHz band: 13.56
315MHz band: 9.84
< 125°C):
8.2, see note 3
Value
100
12
22
(for 434MHz & 868MHz)
NDK NX1255GA
10.5
2.46
12
10
MHz
MHz
MHz
Unit
kΩ
nF
pF
pF
Unit
pF
pF
fF
Ω
15