Texas Instruments XTR300EVM Manuel utilisateur
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
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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
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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
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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
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Input Signal
Vin
DMM
(DC_Volt)
GAIN
OUT IN
SET
R
V V
2R
=
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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
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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.
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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
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Input Signal
Vin
DMM
(DC_Amp)
OUT IN
SET
10
I V
R
=
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
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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.
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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
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