Texas Instruments NA210-214EVM User manual

User's GuideSBOU065 – August 2008

INA210-214EVM User's Guide

This user’s guide describes the characteristics, operation, and use of the INA210-214EVM evaluationmodule (EVM). This EVM is designed to evaluate the performance of the INA210-214 voltage outputcurrent shunt monitors in a variety of configurations. The EVM layout and design are flexible enough toallow evaluation of a wide range of applications. This document also includes a schematic, referenceprinted circuit board (PCB) layouts, and a complete bill of materials.

Contents1 Introduction and Overview .................................................................................................. 22 Quick Start Setup and Use ................................................................................................. 43 INA210-214EVM Circuit ..................................................................................................... 64 Reference Voltage Setup.................................................................................................. 115 INA210-214EVM Schematic and PCB Layout .......................................................................... 126 Bill of Materials ............................................................................................................. 14

List of Figures

1 Hardware Included with the INA210-214EVM ........................................................................... 32 Measurement with Shunt ................................................................................................... 43 Measurement without Shunt ................................................................................................ 54 TO-247 Package In R1 ..................................................................................................... 65 CS3 Package in R1 .......................................................................................................... 66 TO-126 Package in R1 ...................................................................................................... 77 TO-220 Package in R1 ...................................................................................................... 78 Radial Package in R2 ....................................................................................................... 89 U1 Footprint ................................................................................................................. 1010 U1 Populated with DIP Board ............................................................................................ 1011 INA210-214EVM Schematic .............................................................................................. 1212 INA210-214EVM PCB ..................................................................................................... 13

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1 Introduction and Overview

1.1 INA210-214

1.2 INA210-214EVM

Introduction and Overview

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The INA210-214 devices are voltage output, high-side measurement, bi-directional, zero-drift current shuntmonitors. This family of devices has gains that range from 50V/V to 1000V/V. The voltage developedacross the device inputs is amplified by the corresponding gain of the specific device and is presented atthe output pin. These devices can sense voltage drops across shunts at common-mode voltages from–0.3V to 26V, independent of supply voltages. These devices operate with supply voltages between 2.7Vand 26V and draw a maximum of 100 µA. The low offset of the zero-drift architecture enables currentsensing with maximum drops across the shunt as low as 10mV full-scale.

The INA210-214 devices are currently available in an SC70 surface-mount package. Table 1 summarizesthe available device options.

Table 1. INA210-214 Device Summary

Product Gain

INA210 200INA211 500INA212 1000INA213 50INA214 100

The INA210-214EVM is intended to provide basic functional evaluation of this device family. The fixturelayout is not intended to be a model for the target circuit, nor is it laid out for electromagnetic compatibility(EMC) testing.

The layout of the INA210-214EVM printed circuit board (PCB) is designed to provide the followingfeatures:

•Easy handling of the small package; a mechanical drawing of the recommended land pattern is foundat the end of the product data sheet .•Easy access to all device pins•Space for optional input filtering capacitors and resistors as well as a prototype area for additional userdefined circuitry•Space for shunt resistors of various footprints•Multiple input signal options•Evaluation of all gain options through provided device boards as well as a location to solder a testdevice directly onto the board

The INA210-214EVM allows the user to install a shunt resistor, and then connect both the common-modevoltage and load to develop the input voltage, or omit the shunt resistor and apply a differential voltagedirectly to the device input. This flexibility allows a user to test the device operation in a simulated manneras well as an actual application.

Refer to the INA210-214 product data sheet for comprehensive information about the INA210-214 familyof devices.

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1.3 Hardware Included

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Introduction and Overview

The initial release of this evaluation board and user's guide may precede the actual release of somemembers of the INA210-214 device family. As additional devices with the family are released, theINA210-214EVM evaluation board will be associated with them. A test fixture populated with an INA210 isprovided in all INA210-214EVMs delivered, as Figure 1 shows.

Figure 1. Hardware Included with the INA210-214EVM

The INA210-214EVM kit is shipped with the following items:•INA210-214EVM PCB•Five populated test boards (INA210, INA211, INA212, INA213, INA214)

If any of these items are missing or damaged, please contact the Texas Instruments Product InformationCenter nearest you to inquire about a replacement.

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2 Quick Start Setup and Use

2.1 Measurement with Shunt

Load

V+

R1 2

VOUT

VCM

VIN

REF

INA210-214EVM

INA210

DIP

Quick Start Setup and Use

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Follow these procedures to set up and use the INA210-214EVM.Step 1. Insert the device board to be evaluated into the U1 location. The U1 location allows the userto either evaluate one of the provided device boards or install the test device directly on thesurface-mount pads in the U1 footprint.Step 2. Connect an external dc supply voltage between 2.7V and 26V to the V+ terminal referencedto the GND terminal of T3. The INA210-214 device output voltage is limited to 50mV aboveground to 200mV below the supply level.Step 3. Connect the REF terminal of T3 to ground. The voltage applied at the reference input canvary depending on how the device is to be used. Further details regarding the use of thereference voltage are discussed later in this document.Step 4. Connect the input.

This connection method allows the user to install a shunt resistor on the EVM and connect thecommon-mode voltage and load to incorporate the test device directly into a sample application, asFigure 2 shows. To configure a measurement evaluation with a shunt, follow these procedures.1. Install a shunt resistor into the R2 location. If not using a surface-mount or through-hole shunt, pleaserefer to Section 3.1 for a summary of R1 component specifications.2. Connect the common-mode voltage to the V

terminal of T1.3. Connect load to the Load terminal of T1.

Figure 2. Measurement with Shunt

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2.2 Measurement without Shunt

V+

VOUT

VCM

VDIFF

VIN+

VIN-

REF

INA210-214EVM

INA210

DIP

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Quick Start Setup and Use

This connection method allows the user to either simulate the voltage developed across a sense resistorbased on a given set of system conditions, or to connect the INA210-214EVM remotely to an existingshunt already included in an example application. Figure 3 illustrates a measurement configuration withouta shunt.

To configure a measurement evaluation without a shunt, follow these procedures.

1. Connect a differential voltage to the V

IN+

and V

IN–

terminals of T2. With the reference voltage set atground, ensure that the V

IN+

terminal is the more positive of the two inputs.2. Measure the output voltage at the V

OUT

terminal of T2.

Figure 3. Measurement without Shunt

Note: The output voltage is equal to the gain of the device multiplied by the differential voltagemeasured directly at the device input pins.

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3 INA210-214EVM Circuit

3.1 R1

INA210-214EVM Circuit

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This section summarizes the INA210-214EVM components.

R1 can be used for shunt resistors that have a package that may not be easily adaptable to a standard,two-terminal, through-hole footprint or to a 0603 through 1206 surface-mount footprint. Specifically, thiscomponent location was added to allow the use of TO-126, TO-220, TO-247, and four terminal inlineradial packages such as the CS3 series of shunts from Ohmite. The numbers located on the printed circuitboard (PCB) between R1 and J1 correspond to each of the holes in the R1 footprint. Holes with the samenumber are connected together. The designation of 1and 2indicates that a particular hole is connecteddirectly to the V

IN+

and V

IN–

inputs, respectively. The designation of 3and 4indicates that a particular holeis intended for the sense measurement of a four-wire shunt. Care must be taken to ensure that the shuntis placed in the correct position in the R1 location. This placement consideration is evident when using atwo-connection shunt with a spacing of 200 mils (.200in or 5,080mm). As shown in Figure 4 and Figure 7 ,the shunt must be placed in the second 1-designated hole in order for the other leg to fit into the 2position. If the shunt is placed in the first 1position, the second leg is left floating; no differential voltagewill be generated for the current monitor.

Additional packages can be tested by using the provided prototype area of the board.

Figure 4. TO-247 Package In R1 Figure 5. CS3 Package in R1

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INA210-214EVM Circuit

Figure 6. TO-126 Package in R1 Figure 7. TO-220 Package in R1

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3.2 R2

INA210-214EVM Circuit

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R2 is intended to handle two- and four-terminal radial packages (as Figure 8 shows) as well assurface-mount packages that range in size from 0603 to 1206.

Figure 8. Radial Package in R2

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3.3 R3, R4, C1

3.4 Bypass Capacitors and Jumpers

3.5 U1

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INA210-214EVM Circuit

R3 and R4 are factory-installed 0 Ωresistors. These resistors, in combination with C1, form an input filter.These locations allow for both through-hole and surface-mount packages that range in size from 0603 to1206. Additional information regarding the use of input filtering is provided in the INA210-214 product datasheet .

C2 and C3 are 0.1 µF supply bypass capacitors.

J1 is intended to be used as measurements points of R1, if necessary.

J2 is used as a test port at the factory but can be used for the corresponding input and output pins, ifdesired.

U1 is the location for the test device. Five device boards are supplied with the INA210-214EVM board.Each board is populated with one of the available device gains. This interchangeable option allows usersto test the devices and determine the gain setting that is best suited for a given application.

Here is a list of the factors involved in selecting the appropriate device.•The INA210-214 devices are identical with the exception of different gain settings.•The differential input voltage is either applied across the inputs or developed based on the load currentthat flows through the shunt resistor.•The limiting factor that requires attention to be given to device selection is the output voltage.•The selected device must allow the output voltage to remain within the acceptable range after thedeveloped input voltage is amplified by the respective device gain. The output voltage must remainwith the range of 50mV above ground to 200mV below the supply voltage.•An output below the minimum allowable output requires the selection of a device with a higher gain.Likewise, an output above the maximum allowable output requires the selection of a device with alower gain.

In addition to being able to accommodate the device boards, a surface-mount footprint is also included sothe user can install one of these devices directly onto the board, if desired.Figure 9 illustrates the U1footprint on the EVM. Figure 10 shows the U1 slot populated with a DIP board device.

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INA210-214EVM Circuit

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Figure 9. U1 Footprint Figure 10. U1 Populated with DIP Board

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