User's Guide

SBOU048C – April 2007 – Revised April 2013

XTR111 Demonstration Fixture User's Guide

This EVM features the XTR111 voltage-to-current converter integrated circuit and allows for evaluation in

a variety of configurations. This user’s guide describes the characteristics, operation, and use of the

XTR111EVM evaluation board. It discusses how to set up and configure the hardware and reviews

various aspects of the parts operation. Throughout this document the terms demonstration fixture,

evaluation board, evaluation module, and EVM are synonymous with the XTR111EVM. 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.

The following related documents are available through the Texas Instruments web site at www.ti.com.

Table 1. Related Documentation from Texas Instruments

Document

Literature Number

XTR111 Product Data Sheet

SBOS375

QFN / SON PCB Attachment Application Note

SLUA271

Quad Flatpack No-Lead Logic Packages Application Note

SCBA017

Contents

1

Overview

..................................................................................................................... 1

2

Hardware Features

......................................................................................................... 2

3

Basic EVM Configuration

.................................................................................................. 4

4

Schematic, PCB Layout, and Bill of Materials

........................................................................... 6

1

Overview

The XTR111 is a precision voltage-to-current converter designed for standard 0-mA to 20-mA or 4-mA to

20-mA analog signals, but can source up to 36 mA. The ratio between input voltage and output current is

set by a single resistor, R

SET. This reference resistor is an external device because absolute accuracy is

required and performance can be selected to meet application requirements. A few features of the

XTR111 include:

•

An external P-MOSFET ensures high output resistance and a broad compliance voltage range

extending from 2 V below the positive supply (VSP) to voltages well below the negative supply (GND).

•

An adjustable 3-V to 15-V subregulator output provides the supply voltage for additional circuitry.

•

An error flag (EF) is provided to indicate fault conditions on the current output. This flag indicates open

load or high load resistance.

•

The XTR111 also provides output disable control (OD). OD must be asserted low to activate the

output.

The XTR111 is available in either a DFN surface-mount package or an MSOP PowerPAD™ package.

PowerPAD is a trademark of Texas Instruments.

1

SBOU048C – April 2007 – Revised April 2013

XTR111 Demonstration Fixture User's Guide

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