mc68hc908qf4 Freescale Semiconductor, Inc, mc68hc908qf4 Datasheet - Page 191

• Manufacturer Part Number: mc68hc908qf4
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908QF4 — Rev. 1.0
MOTOROLA
NOTE:
(a)
(b)
Figure 17-13. Ouput Characteristic and Matching Network
The configuration shown in
in terms of output power and harmonics rejection. Schematic in
Figure
as the matching network components for 434-MHz frequency band.
Note that the impeder is moved to the load side to decrease its influence (similar
to dc bias through the antenna).
Figure 17-14
with 50-Ω load and with matching network.
Freescale Semiconductor, Inc.
1.5 pF
17-13(b) gives the equivalent circuit of the pin RFOUT and impeder as well
RFOUT
C
For More Information On This Product,
RFOUT PIN
0
gives the output power versus the R
for 434-MHz Frequency Band
V
250 Ω
CC
R
0
Go to: www.freescale.com
Electrical Specifications
MATCHING
39 nH
NETWORK
IMPEDER: TDK MMZ1608Y102CTA00
L
Figure
1
MATCHING
NETWORK
17-13(a) provides a better efficiency
IMPEDER
R
I
3 k Ω
RF OUTPUT
EXT
50 Ω
resistor value, in both cases
330 pF
C
3
UHF Transmitter Module
Electrical Specifications
LOAD
R
L
50 Ω
Data Sheet
191