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MC33492 Datasheet(PDF) 11 Page - Motorola, Inc

Part # MC33492
Description  PLL Tuned UHF Transmitter for Data Transfer Applications
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC33492 Datasheet(HTML) 11 Page - Motorola, Inc

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MC33492
PLL Tuned UHF Transmitter for Data Transfer Applications
11
OUTPUT POWER MEASUREMENT
The RF output levels given in the electrical characteristics section are measured whith a 50
Ω load directly
connected to the pin RFOUT as shown below in figure 7. This wideband coupling method gives results
independant of the application.
Figure 7: Output power measurement configurations
The configuration shown in figure 8-a provides a better efficiency in terms of output power and harmonics
rejection. Schematic on figure 8-b gives the equivalent circuit of the pin RFOUT and impeder as well as the
matching network components for 434MHz frequency band. Note that the impeder is moved to the load side to
decrease its influence (similar to DC bias through the antenna).
Figure 8: Ouput characteristic and matching network for 434MHz frequency band
Figure 9 gives the output power versus the Rext resistor value with 50
Ω load and with matching network.
RFOUT
RF output
50
100pF
Impeder: TDK MMZ1608Y102CTA00
VCC
RFOUT
RF Output
50
Impeder: TDK MMZ1608Y102CTA00
VCC
Matching
Network
C0
R0
Ri
RL
L1
1.5pF
250
3k
50
Matching
330pF
C3
39nH
RFOUT pin
Load
Impeder
(a)
(b)
network
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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