Board Power-Up; Voltage Supply Inputs - Texas Instruments TRF3722EVM User Manual

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3.1

Board Power-up

Power up the board using the following steps:
1. Make sure the jumpers are properly placed as shown in
2. The board can be powered up either by using a single 6-V DC power supply (either using connecter
jack J1 or test point TP7) or using 3.3- and 5-V DC supplies. To obtain optimum phase noise
performance, TI recommends operating the board using clean 3.3- and 5-V linearDC supplies without
engaging the LDOs.
3. Power up the board using a single 6-V DC supply by connecting a 6-V DC supply either at the J1
power connector jack or at the test point (TP7) as shown in
4. When the 6-V DC supply is applied, red LED D1 turns ON.
5. When the 6-V DC supply is connected, the voltage at TP3 should read 3.3 V and the voltage at TP4
should read 5 V.
6. Power the board using 3.3- and 5-V DC supplies by removing jumpers JP12 and JP6. Directly connect
a 3.3-V DC supply at test point TP3 and a 5-V DC supply at test point TP4.
7. At initial power up (before the device is programmed), typical consumption from a 3.3-V DC supply is
around 55 mA (±15 mA) and typical consumption from a 5-V DC supply is around 20 mA (±7 mA).
Figure 5 shows the voltage supply inputs.
SLOU385 – May 2014
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Figure 5. Voltage Supply Inputs
Copyright © 2014, Texas Instruments Incorporated
EVM Jumper Configuration
Table 1.
Figure 5.
TRF3722 EVM User's Guide 5