Texas Instruments XTR300EVM Manuale utente

User's Guide

SBOU034A–February 2006–Revised February 2013

XTR300EVM

This user’s guide describes the characteristics, operation, and use of the XTR300 evaluation module

(EVM) board. It also describes how to set up and configure the hardware and reviews various aspects of

the parts operation. Throughout this document, the terms evaluation board, evaluation module, and EVM

are synonymous with the XTR300EVM. This user’s guide also includes information regarding operating

procedures, input/output connections, an electrical schematic, printed circuit board (PCB) layout, and a

parts list for the EVM.

Contents

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

1.1 XTR300EVM Kit Contents ........................................................................................ 2

1.2 Related Documentation from Texas Instruments .............................................................. 2

2 XTR300EVM Features ..................................................................................................... 3

2.1 External Connections .............................................................................................. 4

2.2 Jumper Configuration Settings ................................................................................... 4

3 Basic EVM Configuration .................................................................................................. 5

3.1 Voltage Mode Configurations ..................................................................................... 5

3.2 Current Mode Configurations ..................................................................................... 8

4 4 Layout, Schematic, and Bill of Materials ............................................................................. 11

4.1 XTR300EVM Layout ............................................................................................. 11

4.2 Complete Schematic ............................................................................................. 11

4.3 Bill of Materials .................................................................................................... 13

SBOU034A–February 2006–Revised February 2013 XTR300EVM

Overview

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1 Overview

The XTR300 is a universal output driver for industrial and process-control applications. This device can be

configured as a current or voltage output device without requiring an external shunt resistor. The XTR300

requires minimal external circuitry, including a few gain-setting resistors and a loop compensation

capacitor. The XTR300 offers separate driver and receiver channels for improved flexibility. The internal

instrumentation amplifier is normally connected for remote voltage sensing in voltage output mode.

Alternatively, it can be used as a high-voltage, high-impedance measurement channel. In voltage output

mode, a copy of the output current is provided to allow for easy testing of the load condition and eventual

calculation of the load resistance. In current output mode, the load voltage can be monitored.

The XTR300 device provides configuration and notification functionality by using the error flag and digital

control pins. The digital output selection capability, together with the error flags and monitor pins, make

remote configuration and troubleshooting possible. Fault conditions on the output and the instrumentation

amplifier (IA) input, as well as overtemperature conditions are indicated by the error flags. The monitoring

pins, IMON and IAOUT, provide continuous feedback regarding load power or impedance. For additional

protection, the maximum output current is internally limited and thermal protection is provided.

The XTR300EVM highlights and demonstrates various configurations of the XTR300. The EVM allows the

user to modify the inputs, configuration pins, and support circuitry to test and evaluate desired behavior.

1.1 XTR300EVM Kit Contents

Table 1 details the contents of the XTR300EVM kit. Contact the Texas Instruments Product Information

Center nearest to you if any component is missing.

Table 1. Contents of XTR300EVM Kit

Item Quantity

XTR300EVM PCB Evaluation Board 1

1.2 Related Documentation from Texas Instruments

The following document provides information regarding Texas Instruments integrated circuits used in the

assembly of the XTR300EVM. This user's guide is available from the TI web site under literature number

SBOU034 . Any letter appended to the literature number corresponds to the document revision that is

current at the time of the writing of this document. Newer revisions may be available from the TI web site

at http://www.ti.com/, or call the Texas Instruments Literature Response Center at (800) 477-8924 or the

Product Information Center at (972) 644-5580. When ordering, identify the document by both title and

literature number

Table 2. Related Documentation

Document Literature Number

XTR300 Product Data Sheet SBOS336

2XTR300EVM SBOU034A–February 2006–Revised February 2013

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XTR300EVM Features

2 XTR300EVM Features

The XTR300EVM is intended to provide basic functional evaluation of the XTR300. The XTR300EVM is

shown in Figure 1 and provides the following features:

• Easy handling of the small QFN package with the recommended land pattern to which the QFN device

is soldered. A mechanical drawing of the recommended land pattern is found at the end of the XTR300

datasheet. The solder connection includes heat sinking through the exposed thermal die pad of the

QFN package.

• Easy access to all pins of the device.

• Easily-configured mode-select pins to switch between voltage output and current output modes.

• LEDs indicators for the error flags.

• Optional use of a +5-V regulated voltage.

• Output protection and filtering circuitry.

Figure 1. XTR300EVM

SBOU034A–February 2006–Revised February 2013 XTR300EVM

XTR300EVM Features

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2.1 External Connections

Make external connections to the XTR300EVM using either the installed test-points or by installing wires

into the terminal block connectors. The main connections that must be made to the XTR300EVM are the

analog supply voltage, analog input signal, and output load and monitoring equipment.

2.1.1 Powering the XTR300EVM

Terminal block TB3 contains the positive and negative power-supply connections, V+ and V–, as well as

the analog ground (GND) and digital ground (DGND) connections. The valid range for the analog supply

voltages is ±10 V to ±20 V. The supplies are decoupled with a 10-µF tantalum capacitor as well as a 1-µF

ceramic capacitor near the device. The XTR300EVM also contains test points for the positive and

negative supply and GND connections located next to TB3.

2.1.2 Single Input

Terminal block TB1 is used for the noninverting input signal, VIN. Its valid range is from –10 V to +10 V.

However, the EVM is configured for a 0-V to 5-V or a ±5-V input signal. A test point connected to VIN is

located next to TB1.

2.1.3 Reference Voltage

Terminal block TB2 allows the user to connect a reference voltage. This reference voltage is used to

produce a bidirectional output from a single-ended source. Shunt J7 to apply an onboard reference

voltage of 5 V. However, never connect an external source to TB2 while the J7 shunt is applied.

2.1.4 XTR300EVM Output

The output for the XTR300EVM is located at terminal block TB4. The output stage of the XTR300 consists

of an IA (IAIN– and IAIN+) and a unique op amp (DRV) that combine to form an analog output that can be

digitally configured to provide either current or voltage output to TB4. OUT+ and OUT– are also connected

to test points near TB4.

2.1.5 Other Test Points

• M1 and M2 are connected to the M1 and M2 mode select pins of the XTR300.

• OD is connected to the output disable (OD) pin of the XTR300.

• OT, LD, and EF are connected to the error flags of the XTR300. These flags are active low.

• IMON is a 1:10 copy of the output current from the OPA in voltage mode. IMON can be used to

monitor the XTR300 output, as well as calculate load resistance or load power.

• IAOUT is a 1:10 copy of the current mode output. A 750-Ωresistor converts this current into a voltage.

• IAIN– is the inverting input of the IA.

• IAIN+ is the noninverting input of the IA.

2.2 Jumper Configuration Settings

There are seven jumpers located on the XTR300EVM. Their functions are described in Table 3.

Table 3. Jumper Settings

Jumper Function

J1 Connects the digital ground pin (DGND) to GND

J2 Pulls the output disable pin (OD) high, enabling the output

J3 Pulls the mode select pin (M2) high

J4 Pulls the mode select pin (M1) high

J5 Applies an offset to the VIN signal. Is used with VREF to create a bidirectional output with a single-ended input

J6 Connects OUT– to ground

J7 Connects an onboard 5-V reference to VREF

4XTR300EVM SBOU034A–February 2006–Revised February 2013

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Input Signal

Vin

DMM

(DC_Volt)

GAIN

OUT IN

SET

V V

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Basic EVM Configuration

3 Basic EVM Configuration

This section describes four configurations for the XTR300EVM that enable evaluation of the basic XTR300

functions.

3.1 Voltage Mode Configurations

3.1.1 Single-Ended Output

The first voltage mode configuration creates a single-ended output from a single ended input. The jumper

settings for this configuration are listed in Table 4. Connect your load to TB4 between OUT+ and OUT–.

Apply ±15 V to V+ and V–. Apply a 5-V signal to VIN. The voltage across TB4 should be 10 V. The voltage

output is calculated by the transfer function shown in Equation 1:

(1)

The default EVM configurations set RGAIN to 10 kΩand RSET to 2.5 kΩ.

Table 4. Single Ended Voltage Output Jumper Settings

Jumper Function

J1 On

J2 On

J3 Off

J4 Off

J5 Off

J6 On

J7 Off

Figure 2. XTR300 Single-Ended Voltage Output Configuration Circuit Drawing

SBOU034A–February 2006–Revised February 2013 XTR300EVM

GAIN IN IN REF

OUT

SET OS

RV V V

V 

2 R R

æ ö

= +

ç ÷

è ø

Basic EVM Configuration

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Figure 3. XTR300EVM Single-Ended Voltage Output Configuration Screenshot

3.1.2 Bidirectional Output

The second voltage-mode configuration creates a bidirectional output from a single-ended input. The

jumper settings for this configuration are listed in Table 5. Connect your load to TB4 between OUT+ and

OUT–. Connect ±15 V to V+ and V–. Apply a 5-V signal to VIN. Connect a 5-V reference voltage to VREF. If

an external reference voltage is not required, a shunt can be placed on J7 to apply an onboard reference

voltage of 5 V. In this configuration, the voltage across TB4 is 10 V. If you apply a 0-V signal to VIN, the

voltage across TB4 is approximately –10 V. The voltage output is calculated by the transfer function in

Equation 2:

(2)

The default EVM configuration sets RGAIN to 10 kΩ, RSET to 2.5 kΩ, and ROS to 2.5 kΩ.

Table 5. Bidirectional Voltage Output Jumper Settings

Jumper Function

J1 On

J2 On

J3 Off

J4 Off

J5 On

J6 On

J7 On(1)

(1) J7 should be off if an external reference is used and on if the internal

reference is to be used.

6XTR300EVM SBOU034A–February 2006–Revised February 2013

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DMM

(DC_Volt)

Input Signal

Vin

Vref

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Basic EVM Configuration

Figure 4. XTR300 Bidirectional Voltage Output Configuration Circuit Drawing

Figure 5. XTR300EVM Bidirectional Voltage Output Configuration Screenshot

SBOU034A–February 2006–Revised February 2013 XTR300EVM

Input Signal

Vin

DMM

(DC_Amp)

OUT IN

SET

I V

Basic EVM Configuration

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3.2 Current Mode Configurations

3.2.1 Single-Ended Output

The first current-mode configuration creates a single-ended output from a single-ended input. The jumper

settings for this configuration are listed in Table 6. Connect your load to TB4 between OUT+ and OUT–.

Apply ±15 V to V+ and V–. Connect a 5-V signal to VIN. Measure the current through the load by attaching

your digital multimeter (DMM) between OUT– and GND. The current though the load is approximately 20

mA. The current output is calculated by the transfer function in Equation 3:

(3)

The default EVM value for RSET is 2.5 kΩ.

Table 6. Single Ended Current Output Jumper Settings

Jumper Function

J1 On

J2 On

J3 On

J4 Off

J5 Off

J6 Off

J7 Off

Figure 6. XTR300 Single-Ended Current Output Configuration Circuit Drawing

8XTR300EVM SBOU034A–February 2006–Revised February 2013

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IN IN REF

OUT

SET OS

V V V

I 10

R R

æ ö

= +

ç ÷

è ø

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Basic EVM Configuration

Figure 7. XTR300EVM Single-Ended Current Output Configuration Screenshot

3.2.2 Bidirectional Output

The second current output configuration creates a bidirectional output from a single-ended input. The

jumper settings for this configuration are listed in Table 7. Connect your load to TB4 between OUT+ and

OUT–. Apply ±15 V to V+ and V–. Connect a 5-V signal to VIN. Connect a 5-V reference to VREF. If there is

no reference voltage, connect J7 to apply an onboard reference voltage of 5 V. Measure the current

though the load by attaching your DMM between OUT– and GND. The current though the load is

approximately 20 mA. Apply a 0-V signal to VIN and measure the current though the load; it is

approximately –20 mA. The output current is calculated by the transfer function in Equation 4:

(4)

The default EVM configuration sets RSET to 2.5 kΩand ROS to 2.5 kΩ.

Table 7. Bidirectional Current Output Jumper Settings

Jumper Function

J1 On

J2 On

J3 On

J4 Off

J5 On

J6 On

J7 Off or on(1)

(1) J7 should be off if an external reference is used and on if the internal

reference is to be used.

SBOU034A–February 2006–Revised February 2013 XTR300EVM

Input Signal

Vin

Vref

DMM

(DC_Amp)

Basic EVM Configuration

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Figure 8. XTR300 Bidirectional Current Output Configuration Circuit Drawing

Figure 9. XTR300EVM Bidirectional Current Output Configuration Screenshot

10 XTR300EVM SBOU034A–February 2006–Revised February 2013

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