Texas Instruments REF35EVM User manual

User’s Guide

REF35EVM User's Guide

ABSTRACT

The REF35EVM is an ultra low-power precision voltage reference evaluation module that demonstrates the

REF35 integrated circuit from Texas Instruments (TI).

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

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.

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REF35EVM User's Guide 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 can be operated from VREF + VDO to 6 V. The REF35 uses only 1.4 μA of current in active mode.

This device comes with a enable pin that allows the device to be set in shutdown mode. Under the shutdown

condition, the REF35 only consumes 0.1 μA of current. The REF35 is optimal 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 so desired.. The VIN header can be connected 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 may 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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REF35EVM User's Guide 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 10uF CAP, CERM, 10 uF, 16 V,

+/-10%, X7R, 1206

1206 GRM31CR71C106KAC7L Murata Electronics

C2, C4, C5, C7 4 0.1uF CAP, CERM, 0.1 uF, 100V, +/-

10%, X7R, 0805

0805 C0805C104K1RACTU KEMET

C6 1 1uF CAP, CERM, 1 uF, 16 V, +/-

10%, X7R, 0805

0805 C0805C105K4RACTU KEMET

C8 1 10uF CAP, CERM, 10 uF, 50 V, +/-

10%, X5R, AEC-Q200 Grade

1, 1206

1206 GRT31CR61H106KE01L Murata Electronics

J1 1 50OHM SMA JACK 50 OHM 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 499OHM 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

7Test Point,Multipurpose,Red,

Keystone

_5010

5010 Keystone

Technologies

TP8, TP9,TP10,

TP11

4Test Point,Miniature,Green, TH 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-VoltageUltralow-

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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REF35EVM User's Guide 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). The "Power Select" jumpers should be set to "Lab". The REF35 consumes 1.4 uA of

current during normal operationg and has a maximum 10 mA of output current for maintaining regulated voltage.

During start-up, the REF35 might consume ISC momentarily 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, a A 5-V (up to the LDO max voltage, 40 V) power supply

capable of 50 mA of current is required. The "Power Select" jumpers should be set 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 load can be 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.

The output voltage of the REF35125QDBVR will be 1.25V.

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

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

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REF35EVM User's Guide 7

Figure 3-2. Bottom Layer

Layout www.ti.com

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Figure 3-3. Top Solder Mask

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REF35EVM User's Guide 9

IMPORTANT NOTICE AND DISCLAIMER

TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE

DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS”

AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY

IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD

PARTY INTELLECTUAL PROPERTY RIGHTS.

These resources are intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate

TI products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable

standards, and any other safety, security, regulatory or other requirements.

These resources are subject to change without notice. TI grants you permission to use these resources only for development of an

application that uses the TI products described in the resource. Other reproduction and display of these resources is prohibited. No license

is granted to any other TI intellectual property right or to any third party intellectual property right. TI disclaims responsibility for, and you

will fully indemnify TI and its representatives against, any claims, damages, costs, losses, and liabilities arising out of your use of these

resources.

TI’s products are provided subject to TI’s Terms of Sale or other applicable terms available either on ti.com or provided in conjunction with

such 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

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