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

1 Overview

The REF70EVM is an adjustable voltage reference evaluation module that demonstrates the REF70 integrated circuit in its FKH ceramic package from Texas Instruments (TI).

The REF70 is a ultra-low noise voltage reference with 2 ppm/C temperature drift. The REF70 is used primarily as a voltage reference for high accuracy data converters to allow for a larger noise free resolution.

The REF70 can be operated from VREF to 18 V, making this part optimal for a wide range of voltages for applications such as precision data acquasition systems, industrial instrumentation, semiconductor test equipment, and PLC analog I/O modules. In order for this device to operate as intended, it does require 6.5 mA IQ(max) for proper operating across temperature. This device also comes with a enable pin that allows the device to be set in shutdown mode. Under the shutdown condition, the REF70 only consumes 12 μA of current.

The REF70EVM is configured for a LCCC (FKH) ceramic package (U2) and includes a additional MSSOP (DGK) landpattern for alternate packages (U1). The VIN header can be connected to an external power supply to provide power. All of the REF70 input and output pins are accessible for external connection via test headers. For users looking for a alternate packages to test the REF70, contact TI.