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EVM User's Guide: REF8EVM
REF80 Evaluation Module
Description
The REF8EVM is a precision voltage reference
evaluation module that demonstrates the performance
of high precision series reference device (REF80)
and the internal heater from Texas Instruments.
The REF80 is a family of low drift, and low noise
buried zener, internal heater compensated voltage
reference devices. REF80 offers low temperature drift
coefficient, low flicker noise, and low long-term drift.
Get Started
1. Order the EVM from the
2. Configure EVM jumpers to select power supply
method.
3. Connect VIN and heater VIN to power supplies.
4. Test the output.
SNAU304A – AUGUST 2024 – REVISED OCTOBER 2024
Submit Document Feedback
REF80 tool
page.
REF8EVM Board
Copyright © 2024 Texas Instruments Incorporated
Features
•
Choice of powering REF80 directly from bench
power supply or on board LDO.
•
Integrated heater for improved performance.
•
Output stable LED to indicate when the heater
temperature has settled.
•
Many different methods of measuring available,
including banana plugs, unpopulated footprints for
binding posts, and SMA connectors.
•
Compatible with DAC11001B EVM via SMA
connection.
Applications
•
Semiconductor test and ATE
•
Digital multimeter (DMM)
•
Signal generator
•
Battery test
•
Precision data acquisition systems
Description
REF80 Evaluation Module
1
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Related Manuals for Texas Instruments REF8EVM
Summary of Contents for Texas Instruments REF8EVM
- Page 1 Description EVM User's Guide: REF8EVM REF80 Evaluation Module Description Features The REF8EVM is a precision voltage reference • Choice of powering REF80 directly from bench evaluation module that demonstrates the performance power supply or on board LDO. of high precision series reference device (REF80) •...
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Page 2: Kit Contents
REF8EVM primary function is to evaluate the REF80 buried zener, precision voltage reference. Banana plugs enable direct connection to a 3458A DMM. A cover and TSET resistor allow for thorough performance evlauation of temperature drift. REF8EVM can be configured to be powered directly from the lab power supply or on board LDOs. - Page 3 HEATM Heater GND Figure 2-1. REF8EVM Setup The REF8EVM is designed to allow users to evaluate the configuration shown in Figure 2-1. Multiple power supply options are provided for the input voltage so that the user can evaluate for best performance in applications.
- Page 4 2.2 EVM Connection There are multiple options to power up REF8EVM. There are onboard LDOs provided or users can bypass the LDOs to directly power REF80 with an external power supply. The TPS7A4901DRBR, a low noise LDO, and LM317AEMP/NOPB, a high output current LDO, can be used if a low noise, regulated input voltage is desired to further isolate the noise of REF80 from the noise generated by a bench power supply.
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Page 5: Jumper Information
Finally, footprints are included on the board to install precision film resistors on R4 and R5 to help aid in validation, if desired. If users want to measure the output of REF8EVM using the SMA connector, then users can remove the banana plugs, thus allowing the board to rest on the standoffs installed in each corner of the board. -
Page 6: Best Practices
Wait to begin measuring at least until the output voltage has settled and the LED has turned off, representing that REF80 internal heater temperature is now stable. REF80 Evaluation Module SNAU304A – AUGUST 2024 – REVISED OCTOBER 2024 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated... - Page 7 SMA cables to avoid unwanted offsets due to imbalanced thermal EMF. 3.2 Performance Data and Results Output voltage of REF8EVM is measured with dropout conditions meets the initial accuracy, long-term drift, and temperature drift specification limit. Device meets line regulation specifiation and shutdown condition for relevant tests.
- Page 8 Hardware Design Files www.ti.com 4 Hardware Design Files 4.1 Schematics The schematic for the REF8EVM is illustrated in Figure 4-1Figure 4-1. Figure 4-1. REF8EVM Schematic REF80 Evaluation Module SNAU304A – AUGUST 2024 – REVISED OCTOBER 2024 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 9 Hardware Design Files 4.2 PCB Layouts REF8EVM is a four layer board. The layout is illustrated in this section. Figure 4-2. REF8EVM Top Layer Figure 4-3. REF8EVM 2nd Layer SNAU304A – AUGUST 2024 – REVISED OCTOBER 2024 REF80 Evaluation Module Submit Document Feedback Copyright ©...
- Page 10 Hardware Design Files www.ti.com Figure 4-4. REF8EVM 3rd Layer Figure 4-5. REF8EVM Bottom Layer REF80 Evaluation Module SNAU304A – AUGUST 2024 – REVISED OCTOBER 2024 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
- Page 11 Hardware Design Files 4.3 Bill of Materials (BOM) Table 4-1 lists the bill of materials for REF8EVM. Table 4-1. Bill of Materials Designator Description Package Reference Part Number Manufacturer 0603 CAP CER 1UF 25V X7R 0603 C1608X7R1E105K080AB TDK Coporation 0603 CAP, CERM, 0.1µF, 25V,+/- 10%, X5R, 0603...
- Page 12 M3x0.5 Hex Nut 0.217" (5.51mm) Nylon 4688 Keystone Electronics M3x0.5 Pan Head Machine Screw Slotted Drive 50M030050N020 Essentra Components Nylon REF80 Evaluation Module SNAU304A – AUGUST 2024 – REVISED OCTOBER 2024 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated...
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Page 13: Compliance Information
Texas Instruments integrated circuits used in the assembly of the REF8EVM. This user's guide is available from the TI web site under literature number SNAU304. Any letter appended to the literature number corresponds to the document revision that is current at the time of the writing of this document. - Page 14 STANDARD TERMS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms set forth herein.
- Page 15 www.ti.com Regulatory Notices: 3.1 United States 3.1.1 Notice applicable to EVMs not FCC-Approved: FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and software developers to write software applications for use with the end product.
- Page 16 www.ti.com Concernant les EVMs avec antennes détachables Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à...
- Page 17 www.ti.com EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS. 4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling or using the EVM, including without limitation any warning or restriction notices.
- Page 18 Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2023, Texas Instruments Incorporated...
- Page 19 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 © 2024, Texas Instruments Incorporated...
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