Texas Instruments REF35 User manual

User's Guide

REF35 Evaluation Module

ABSTRACT

The REF35 Evaluation Module (EVM) is an ultra low-power precision voltage reference evaluation module that

demonstrates the REF35 integrated circuit from Texas Instruments.

Table of Contents

1 Overview..................................................................................................................................................................................2

1.1 REF35EVM Features......................................................................................................................................................... 2

1.2 REF35EVM Schematic...................................................................................................................................................... 3

1.3 REF35EVM Bill of Materials...............................................................................................................................................4

1.4 REF35EVM Board..............................................................................................................................................................5

2 Quick Setup Guide..................................................................................................................................................................6

2.1 Electrostatic Discharge Warning........................................................................................................................................ 6

2.2 Power Supply Setup and Functional Test.......................................................................................................................... 6

3 Layout...................................................................................................................................................................................... 7

4 Revision History......................................................................................................................................................................9

List of Figures

Figure 1-1. REF35EVM Schematic..............................................................................................................................................3

Figure 1-2. REF35EVM Board Top.............................................................................................................................................. 5

Figure 1-3. REF35EVM Board Bottom........................................................................................................................................ 5

Figure 3-1. Top Layer...................................................................................................................................................................7

Figure 3-2. Bottom Layer............................................................................................................................................................. 8

Figure 3-3. Top Solder Mask........................................................................................................................................................9

List of Tables

Table 1-1. REF35EVM BOM........................................................................................................................................................4

Trademarks

All trademarks are the property of their respective owners.

www.ti.com Table of Contents

SNAU276A – JANUARY 2022 – REVISED NOVEMBER 2023

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REF35 Evaluation Module 1

1 Overview

The REF35EVM is a voltage reference evaluation module that demonstrates the REF35 integrated circuit from

Texas Instruments (TI).

The REF35 is an ultra-low power voltage reference with maximum 10 ppm/C temperature drift. The REF35 is

used primarily as a voltage reference for low power data converters.

The REF35 is operable from VREF + VDO to 6 V. The REF35 uses only 1.4 μA of current in active mode. This

device comes with an enable pin that allows the device to be set in shutdown mode. The REF35 consumes only

0.1 μA of current under the shutdown condition. REF35 is available for a wide range of applications such as

flow transmitters, blood glucose monitors, servo drive control modules, power quality analyzers, fault indicators,

oscilloscopes and process analytics.

The REF35EVM features a user selectable-wide VIN input which uses a TPS7B8150 linear regulator, allowing

the user to widen the input range to 40 V if desired. The VIN header is connectable to an external power supply

to provide power. All of the REF35 input and output pins are accessible for external connection via test headers.

1.1 REF35EVM Features

• Includes: REF35125QDBVR

• Footprints for resistors and capacitors

• Multiple outputs for voltage measurements

KEY PARAMETERS PARAMETER PARAMETER LIMITS

Supply Voltage (VREF): IN_VREF 0 V – 6 V

Supply Voltage (VLDO) IN_LDO 0 V to 40 V

Enable Pin EN 0 V to IN_VREF

Fixed Output Voltage: VREF 1.25 V (REF35125QDBVR)

Output Current: IOUT -5 mA to 10 mA

CAUTION

Applying voltages above the limitations given in this table can cause permanent damage to your

hardware.

Overview www.ti.com

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1.2 REF35EVM Schematic

The schematic for the REF35EVM is illustrated in Figure 1-1.

Figure 1-1. REF35EVM Schematic

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REF35 Evaluation Module 3

1.3 REF35EVM Bill of Materials

Table 1-1. REF35EVM BOM

DESIGNATOR QTY VALUE DESCRIPTION PACKAGE PART NUMBER MANUFACTURER

!PCB 1 Printed Circuit Board LP053

C1, C3 2 10 uF CAP, CERM, 10 uF, 16 V, ±

10%, X7R, 1206

1206 GRM31CR71C106KAC7L Murata Electronics

C2, C4, C5, C7 4 0.1 uF CAP, CERM, 0.1 uF, 100 V, ±

10%, X7R, 0805

0805 C0805C104K1RACTU KEMET

C6 1 1 uF CAP, CERM, 1 uF, 16 V, ±

10%, X7R, 0805

0805 C0805C105K4RACTU KEMET

C8 1 10 uF CAP, CERM, 10 uF, 50 V, ±

10%, X5R, AEC-Q200 Grade

1, 1206

1206 GRT31CR61H106KE01L Murata Electronics

J1 1 50 Ω SMA JACK 50 Ω EDGE MNT,

SMT

SMT 142-0711-821 Cinch Connectivity

Solutions Johnson

P1, P2, P3 3 100mil Header, 100mil, 2x1, Tin, TH TH PEC02SAAN Sullins Connector

Solutions

P4, P5, P6, P7 4 100mil Header, 100mil, 3x1, Tin, TH TH PEC03SAAN Sullins Connector

Solutions

R1 1 499 Ω RES, 499, 1%, 0.125 W, AEC-

Q200 Grade 0, 0805

0805 CRCW0805499RFKEA Vishay Dale

R2 1 1k RES, 1.00 k, 1%, 0.125W,

AEC-Q200 Grade 0, 0805

0805 CRCW08051K00FKEA Vishay Dale

R3, R4 2 0 RES, 0, 5%, 0.333 W, AEC-

Q200 Grade 0, 0805

0805 CRCW08050000Z0EAHP Vishay Dale

R5 1 10M RES, 10.0 M, 1%, 0.125 W,

0805

0805 CRCW080510M0FKEA Vishay Dale

TP1, TP2, TP3,

TP4, TP5,TP6,

TP7

7 Test Point,Multipurpose, Red,

Keystone

_5010

5010 Keystone

Technologies

TP8, TP9,TP10,

TP11

4 Test Point, Miniature,Green,

Keystone

_5116

5116 Keystone

Technologies

U1 1 Ultra Low-Power, High-

Precision Voltage Reference,

SOT23-6

SOT23-6 REF35125QDBVR Texas Instruments

U2 1 150-mA High-Voltage

Ultralow-IQ Low-Dropout

Regulator,DRV0006A

(WSON-6)

WSON-6 TPS7B8150QDRVRQ1 Texas Instruments

Overview www.ti.com

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1.4 REF35EVM Board

The PCB layout for the REF35EVM is illustrated in Figure 1-2 and Figure 1-3.

Figure 1-2. REF35EVM Board Top

Figure 1-3. REF35EVM Board Bottom

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REF35 Evaluation Module 5

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). Set the Power Select jumpers to Lab. The REF35 consumes 1.4 uA of current during

normal operating and has a maximum 10 mA of output current for maintaining regulated voltage. During start-up,

the REF35 can momentarily consume ISC 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, an A 5-V (up to the LDO max voltage, 40 V) power supply

capable of 50 mA of current is required. Set the Power Select jumpers 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 loads are 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.

Note

Test points TP8, TP9, TP10, and TP11 are not soldered to the ground plane. The user can connect

TP8, TP9, TP10, and TP11 to an external source ground if desired. Additionally, SMA connector J1 is

not soldered to the ground plane.

The output voltage of the REF35125QDBVR is 1.25 V.

Shutdown mode: Move the jumper pin from EN to SHDN to place the part in shutdown mode. The REF35 is in

active mode if the jumper pin is either in EN or not present.

Quick Setup Guide www.ti.com

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3 Layout

Figure 3-1 and Figure 3-2 show the top and bottom layers and Figure 3-3 shows the top solder mask of the

EVM.

Figure 3-1. Top Layer

www.ti.com Layout

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REF35 Evaluation Module 7

Figure 3-2. Bottom Layer

Layout www.ti.com

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Figure 3-3. Top Solder Mask

www.ti.com Revision History

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REF35 Evaluation Module 9

4 Revision History

Changes from Revision * (January 2022) to Revision A (November 2023) Page

• Updated the numbering format for tables, figures, and cross-references throughout the document................. 1

• Added a note and information about output voltage and shutdown mode......................................................... 6

Revision History www.ti.com

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