Texas Instruments Chipset TRF2436EVM - Manual (Page 2)

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1.4 Hardware Configuration
2 TRF2436EVM Operational Procedure
2.1 TX Operation
TRF2436EVM Operational Procedure
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
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.
TRF2436EVM 2 SLWU038 – August 2006
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