Datasheet

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SingleendedRFout

Tospectrumanalyzeror Agilent5052

DB25 TOPC

DCinputfor

Openlooptest

Referenceinput

Tolowphasenoise

Reference.

Powersupply

Connection

Topowersupply.

DifferentialRFout

Notconnected.

2 Software Setup

Software Setup

To achieve the test data, all hardware that is supplied with EVM is required. TRF3761 measured

performance depends on the phase noise characteristics of the reference source used as well as the

resolution of the hardware used for phase noise measurements.

The setup of the device is simple. See Figure 1 .

Figure 1. Single Output Without Balun

The board shown in Figure 1 has a 3-dB lower output power when configured as a single-ended output,

approximately 0 dBm. When converting to a differential output by removing the 50- Ω resistor R32 in the

differential path the output power should increase by 3-dB minus the balun losses. Components can be

added to achieve a tuned reactive load which improves the output power. See Appendix B for output

configuration options.

The following items are provided in the TRF3761EVM kit.

• CD-ROM

• EVM board

• Power cable

• Programming cable

The LabVIEW™ software provided by Texas Instruments on the accompanying CD is the software that

configures the TRF3761. It is used to set the registers inside the device for normal operation. The

LabVIEW software interfaces to the EVM via a DB25 connector. The chip uses a SPI interface protocol

with data formatted as little endian, which means the LSB is clocked in first.

2 TRF3761 EVM User's Guide SLWU035A – February 2007 – Revised March 2007

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