XTR300EVM Features
www.ti.com
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, V
IN
. 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 V
IN
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-
Ω
resistor 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 V
IN
signal. Is used with V
REF
to create a bidirectional output with a single-ended input
J6
Connects OUT– to ground
J7
Connects an onboard 5-V reference to V
REF
4
XTR300EVM
SBOU034A – February 2006 – Revised February 2013
Submit Documentation Feedback
Copyright © 2006–2013, Texas Instruments Incorporated