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access to the MUXOUT pin. An LED is also connected for visual
identification. Note that R13 and R14 are removed. R12 limits the current
going into the LED. To connect the MUXOUT output to the parallel port
connector J5, install R2 (0 Ω).
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W1—This jumper controls the chip enable. When this signal is a logic 1,
the devices is in operate mode. The default setting for the EVM is with W1
between pins CE and HI.
To prepare the TRF3750 EVM for evaluation, connect the following:
1) 5 V to J1−1 and the return to J1−3.
2) 7 V to J1−5 and the return to J1−3.
3) 3.3 V to J1−2 and J1−4 and the return to J1−3.
4) If a crystal oscillator (usually 10 MHz) is installed go to step 5.
5) Use a frequency generator with 50-Ω output to input a 10-MHz
single-ended, 3 Vpp, 0-V offset square or sine wave signal to SMA
connector J4 (REFIN). Another option is to use the 10-MHz output of a
spectrum analyzer or phase-noise analyzer.
6) Connect the supplied serial interface cable to the parallel port of a PC and
the EVM.
7) Start the TRF3750 interface software and load the desired settings.
8) The VCO RF output can now be monitored using SMA connector J3. The
TRF3750 internal signals can be monitored using TP2 or the PC if R2 is
installed.
EVM Configuration
Hardware Configuration
3-3
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