Texas Instruments TRF2436EVM Hardware Configuration, TX Operation, LO input drive, Filtering

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TRF2436EVM Operational Procedure

1.4Hardware Configuration

The TRF2436EVM can be set up in a variety of configurations to accommodate a specific mode of operation. Before starting an evaluation, decide on the configuration and make the appropriate connections or changes. The demonstration board comes with the following factory-set configuration:

Jumper J10 installed between 1-2 Jumper J11 installed between 2-3 Jumper J12 installed between 1-2 Jumper J13 installed between 1-2 Jumper J14 installed between 1-2

LO input drive

The TRF2436 has been designed to be driven with a differential LO input. A simple balun centered at ~2.6 GHz can be used to convert a single-ended input from an RF source to a differential pair to provide a differential LO to the EVM through SMA connectors J3 and J4.

The 2436 will function if driven single-ended, but it is not designed to operate in this condition, nor has it

been evaluated in this condition. To drive the LO single-ended, connect an RF source to the LOP SMA (J3) and terminate the LON SMA (J4) input with 50 Ω.

Filtering

The TRF2436EVM is provided with no filtering. The mixer output, PA input/LNA output, and RF input/output pins are brought out directly to SMA connectors on the EVM. Filtering may be incorporated by:

∙Connecting an external filter to RFANTA (J6) for filtering after the PA in TX mode or before the LNA in RX mode.

∙Connecting an external filter between the MFA (J8) and RFA (J9) jacks for filtering between the mixer and PA/LNA stages

2 TRF2436EVM Operational Procedure

2.1TX Operation

1.Connect +3.3 V to P1 and ground to P2 but do not turn on.

2.Connect differential LO source to LOP/LON jacks (or use external balun).

Set the appropriate frequency and power level between 0 to +4 dBm. Remember that for A-band operation, the LO input frequency is doubled inside the TRF2436; so, the LO should be set to half the frequency desired at the mixer LO port.

3.Connect an IF source to the IF port. Set to 374 MHz with a typical power level of –20 dBm.

4.Set ABSEL (J12) to a logic high 1.

5.Set TR (J13) to a logic high 1.

6.Set PA_B SEL (J11) to a logic low 0.

7.Set PA_A SEL (J10) to logic high 1.

8.RXDGC = don’t care

9.For mixer stage measurement:

a.Terminate RFA (J9) and RFANTA (J6) into 50 Ω.

b.Connect a spectrum analyzer to MFA (J8).

c.Turn on the 3.3-V power supply (~300 mA to 320 mA).

d.Observe the output of the mixer stage on a spectrum analyzer.

10.For PA stage measurement:

a.Terminate IF (J7) and MFA (J8) into 50 Ω.

b.Apply an RF to RFA (J9).

c.Connect a spectrum analyzer to RFANTA (J6).

d.Turn on the power supply.

e.Observe the PA output on a spectrum analyzer.

2 TRF2436EVM SLWU038 –August 2006

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