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User's Guide
REF70EVM User's Guide
The REF70EVM is a precision voltage reference evaluation module that demonstrates the REF70 ultra-low noise
integrated circuit from Texas Instruments (TI).
Trademarks.................................................................................................................................................................................1
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Overview..................................................................................................................................................................................2
1.1 REF70EVM Features.........................................................................................................................................................
1.2 REF70EVM Schematic......................................................................................................................................................
Materials...............................................................................................................................................4
Board..............................................................................................................................................................5
Guide..................................................................................................................................................................6
2.1 Electrostatic Discharge Warning........................................................................................................................................
2.2 Unpacking the EVM...........................................................................................................................................................
2.3 Power Supply Setup and Functional Test..........................................................................................................................
Operation....................................................................................................................................................7
Output's OUTF and OUFS........................................................................................................................................
3.2 Output Capacitor................................................................................................................................................................
4 Layout and Component
Trademarks
All other trademarks are the property of their respective owners.
SNVU699 - OCTOBER 2020
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Placement.......................................................................................................................................8
Copyright © 2020 Texas Instruments Incorporated
ABSTRACT
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REF70EVM User's Guide
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Summary of Contents for Texas Instruments REF70EVM
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Page 1: Table Of Contents
Table of Contents User’s Guide REF70EVM User's Guide ABSTRACT The REF70EVM is a precision voltage reference evaluation module that demonstrates the REF70 ultra-low noise integrated circuit from Texas Instruments (TI). Table of Contents Trademarks....................................1 Overview....................................2 1.1 REF70EVM Features................................. 1.2 REF70EVM Schematic.............................. -
Page 2: Overview
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. -
Page 3: Ref70Evm Schematic
Overview 1.2 REF70EVM Schematic The schematic for the REF70EVM is illustrated in Figure 1-1. Figure 1-1. REF70EVM Schematic SNVU699 – OCTOBER 2020 REF70EVM User's Guide Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated... -
Page 4: Ref70Evm Bill Of Materials
Overview www.ti.com 1.3 REF70EVM Bill of Materials DESIGNATOR QUANTITY VALUE DESCRIPTION PACKAGE PART NUMBER MANUFACTURER REFERENCE !PCB Printed Circuit LP026 Board C1, C3, C5, C7 10uF CAP, CERM, 10 uF, 1206 GMK316AB7106KL Taiyo Yuden 35 V, +/- 10%, X7R, 1206 C2, C6 0.1uF... -
Page 5: Ref70Evm Board
Overview 1.4 REF70EVM Board The PCB layout for the REF70EVM is illustrated in Figure 1-2 Figure 1-3. Figure 1-2. REF70EVM Board Top Figure 1-3. REF70EVM Board Bottom SNVU699 – OCTOBER 2020 REF70EVM User's Guide Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated... -
Page 6: Quick Setup Guide
This section describes the setup to quickly check the functionality of the REF70EVM. 2.1 Electrostatic Discharge Warning Many of the components on the REF70EVM 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. -
Page 7: Evm Theory And Operation
IR loss from long trace wires at high currents. In the normal active configuration, the OUTF and OUTS are shorted together. In the REF70EVM this is done by the R1 and R2 which are 0 Ohm resistors. - Page 8 Figure 6 and Figure 7 show the top and bottom layouts, Figure 8 and Figure 9 show the top and bottom layers, and Figure 10 shows the top solder mask of the EVM. Figure 4-1. Component Placement—Top Assembly REF70EVM User's Guide SNVU699 – OCTOBER 2020 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated...
- Page 9 Layout and Component Placement Figure 4-2. Component Placement—Bottom Assembly Figure 4-3. Layout Top SNVU699 – OCTOBER 2020 REF70EVM User's Guide Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated...
- Page 10 Layout and Component Placement www.ti.com Figure 4-4. Layout Bottom Figure 4-5. Top Layer REF70EVM User's Guide SNVU699 – OCTOBER 2020 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated...
- Page 11 Layout and Component Placement Figure 4-6. Bottom Layer Figure 4-7. Top Solder Mask SNVU699 – OCTOBER 2020 REF70EVM User's Guide Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated...
- Page 12 TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable warranties or warranty disclaimers for TI products. TI objects to and rejects any additional or different terms you may have proposed. IMPORTANT NOTICE Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2022, Texas Instruments Incorporated...
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