SNVU699 October   2020

 

  1.   Trademarks
  2. 1Overview
    1. 1.1 REF70EVM Features
    2. 1.2 REF70EVM Schematic
    3. 1.3 REF70EVM Bill of Materials
    4. 1.4 REF70EVM Board
  3. 2Quick Setup Guide
    1. 2.1 Electrostatic Discharge Warning
    2. 2.2 Unpacking the EVM
    3. 2.3 Power Supply Setup and Functional Test
  4. 3EVM Theory and Operation
    1. 3.1 VREF Output's OUTF and OUFS
    2. 3.2 Output Capacitor
  5. 4Layout and Component Placement

2.3 Power Supply Setup and Functional Test

Normal operation:

A 5-V power supply capable of 50 mA of current is required. The REF70 consumes 6.5 mA of current during normal operationg and has a maximum 10 mA of output current for maintaining regulated voltage. During start-up, the REF70 might consume ISC momentarily to charge the output capacitors.

Connect the positive power supply lead to the "VIN" on J6. Connect the negative power supply lead to "GND" on J8.

Connect a voltmeter positive terminal to "OUTF" on J7. Connect the negative voltmeter terminal to "GND" on J8.

The output voltage of the REF7025QFKH will be 2.5V.

Shutdown mode:

The REF70 "EN" pin has an internal pull up which makes the REF70 be active when EN is floating. Use header J5 to connect "EN" to "GND" to put the device in shutdown mode.