MC33492 查看數據表（PDF） - Motorola => Freescale

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MC33492

PLL Tuned UHF Transmitter for Data Transfer Applications

Motorola => Freescale 

Freescale SMeCm33ic49o2nductor, Inc.

OUTPUT POWER MEASUREMENT

The RF output levels given in the electrical characteristics section are measured whith a 50Ω 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

VCC

RFOUT

Impeder: TDK MMZ1608Y102CTA00

RF output

100pF

50 Ω

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

VCC

Impeder: TDK MMZ1608Y102CTA00

(a)

RFOUT

Matching

RF Output

Network

50 Ω

Matching

network

330pF

L1

C3

(b)

39nH

50Ω

3kΩ

C0

R0

1.5pF 250Ω

RFOUT pin

Ri

Impeder

RL

Load

Figure 9 gives the output power versus the Rext resistor value with 50Ω load and with matching network.

For More Information On This Product,

PLL Tuned UHF TGraonstmo:itwtewr fwor.fDraeteasTcraanles.fceroAmpplications

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