參數(shù)資料
型號(hào)： MC33493DTB
廠商： MOTOROLA INC
元件分類： 消費(fèi)家電
英文描述： PLL tuned UHF Transmitter for Data Transfer Applications
中文描述： SPECIALTY CONSUMER CIRCUIT, PDSO14
封裝： TSSOP-14
文件頁數(shù)： 15/20頁
文件大?。?/td> 595K
代理商： MC33493DTB
COMPLETE APPLICATION SCHEMATIC AND PCB FOR FSK MODULATION
MOTOROLA
MC33493 Technical Data
15
on following tables 3 and 4.
Table 3: External components description for OOK
Function
Note 3: C6 value equals recommended crystal load capacitance reduced by the PCB stray capacitances.
Examples of crystal reference are given below (see characteristics on table 4) for different application bands:
- at 315MHz band (f
reference
= 9.84375MHz, -40°C < T
A
<
85°C): NDK LN-G102-950,
- at 434/868MHz bands (f
reference
= 13.56MHz, -40°C < T
A
< 125°C):
NDK NX8045GB/CSJ S1-40125-8050-12 and NDK NX1255GA.
Table 4: Typical crystal characteristics (SMD package)
NDK NX8045GB/CSJ
S1-40125-8050-12
(for 434MHz & 868MHz)
Load capacitance
12
Motional capacitance
3.33
Static capacitance
1.05
Loss resistance
28
Figure 13 shows a two buttons keyfob board. Size is 30 x 45 millimeters.
Figure 13: Two buttons keyfob board layout
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
carrier
= 433.92MHz. C
1
capacitor can be removed if switch debounce is done by
software.
Component
Value
Unit
MHz
MHz
MHz
Y1
Crystal,
see table 4
315MHz band: 9.84
434MHz band: 13.56
868MHz band: 13.56
R2
RF output level setting
resistor (R
ext
)
Crystal load capacitor
Power supply decoupling
capacitors
12
k
C6
C7
C8
8.2, see note 3
22
100
pF
nF
pF
Parameter
NDK LN-G102-950
(for 315MHz)
NDK NX1255GA
(for 434MHz & 868MHz)
Unit
12
4.4
1.5
18.5
12
10.5
2.46
10
pF
fF
pF
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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