Texas Instruments REF35EVM, Руководство пользователя, Страница: 6 / 10

2 Quick Setup Guide
This section describes the setup to quickly check the functionality of the REF35EVM.
2.1 Electrostatic Discharge Warning
Many of the components on the REF35EVM are susceptible to damage by electrostatic discharge (ESD).
Customers are advised to observe proper ESD handling precautions when unpacking and handling the EVM,
including the use of a grounded wrist strap at an approved ESD workstation.
CAUTION
Failure to observe ESD handling procedures may result in damage to EVM components.
2.2 Power Supply Setup and Functional Test
Normal operation:
If directly connecting the REF35 to the lab supply, a A 5-V power supply capable of 50 mA of current is required
(to handle load transients). The "Power Select" jumpers should be set to "Lab". The REF35 consumes 1.4 uA of
current during normal operationg and has a maximum 10 mA of output current for maintaining regulated voltage.
During start-up, the REF35 might consume I
SC
momentarily to charge the output capacitors.
Connect the positive power supply lead to the "VIN_REF" pin on the "REF Power" header pin on the left side of
the board. Connect the negative power supply lead to the "GND" pin on the "REF Power" header pin.
If powering the REF35 through the on-EVM LDO, a A 5-V (up to the LDO max voltage, 40 V) power supply
capable of 50 mA of current is required. The "Power Select" jumpers should be set to "LDO".
Connect the positive power supply lead to the "VIN_REF" pin on the "REF Power" header pin on the left side of
the board. Connect the negative power supply lead to the "GND" pin on the "REF Power" header pin.
This EVM features selectable loads, where the load can be pulled to GND or VCC.
Connect a voltmeter to the VREF pin on the right side of the board. Connect the negative voltmeter terminal to
"GND". An SMA cable can also be used to measure the same output.
The output voltage of the REF35125QDBVR will be 1.25V.
Shutdown mode: Move the jumper pin from EN to SHDN to place the part in shutdown mode. The REF35 will be
in active mode if the jumper pin is either in EN or not present.
Quick Setup Guide www.ti.com
6 REF35EVM User's Guide SNAU276 – JANUARY 2022
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