Texas Instruments LMP8278MM Evaluation Board LMP8278MMEVAL/NOPB LMP8278MMEVAL/NOPB Scheda Tecnica
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LMP8278MMEVAL/NOPB
User's Guide
SNAA135A – February 2012 – Revised April 2013
AN-2223 LMP8278Q VSSOP Evaluation Board
1
Introduction
The LMP8278Q VSSOP Evaluation Board,
, is designed to evaluate the LMP8278Q current sense
amplifier. The LMP8278Q is a 40V Common Mode, Unidirectional Precision Current Sensing amplifier with
a gain of 14x. This board has an LMP8278Q part mounted on the PCB together with a de-coupling
capacitor, power supply connections, and input and output connectors.
a gain of 14x. This board has an LMP8278Q part mounted on the PCB together with a de-coupling
capacitor, power supply connections, and input and output connectors.
2
General Description
The LMP8278Q is a fixed 14x gain precision current sense amplifier. The part amplifies and filters small
differential signals in the presence of high common mode voltages. The part operates from a single 5V
supply voltage. With an input common mode voltage range from –2V to +28V the gain is very precise
(±0.5%). The part can handle common mode voltages in the range –2V to +40V with relaxed
specifications. The LMP8278Q is a member of the Linear Monolithic Precision ( LMP™) family and is ideal
for unidirectional current sensing applications.
differential signals in the presence of high common mode voltages. The part operates from a single 5V
supply voltage. With an input common mode voltage range from –2V to +28V the gain is very precise
(±0.5%). The part can handle common mode voltages in the range –2V to +40V with relaxed
specifications. The LMP8278Q is a member of the Linear Monolithic Precision ( LMP™) family and is ideal
for unidirectional current sensing applications.
The part has a precise gain of 14x, which is adequate in most targeted applications to drive an ADC to its
full scale value. The fixed gain is achieved in two separate stages, a preamplifier with a gain of 7x and an
output stage buffer amplifier with a gain of 2x. The connection between the two stages of the signal path is
brought out on two pins to enable the possibility to create an additional filter network around the output
buffer amplifier. These pins can also be used for alternative configurations with different gain as described
in the applications section of the datasheet.
full scale value. The fixed gain is achieved in two separate stages, a preamplifier with a gain of 7x and an
output stage buffer amplifier with a gain of 2x. The connection between the two stages of the signal path is
brought out on two pins to enable the possibility to create an additional filter network around the output
buffer amplifier. These pins can also be used for alternative configurations with different gain as described
in the applications section of the datasheet.
The LMP8278Q incorporates enhanced manufacturing and support processes for the automotive market,
including defect detection methodologies. Reliability qualification is compliant with the requirements and
temperature grades defined in the AEC Q100 standard.
including defect detection methodologies. Reliability qualification is compliant with the requirements and
temperature grades defined in the AEC Q100 standard.
Figure 1. LMP8278Q Evaluation Board
LMP is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
All other trademarks are the property of their respective owners.
1
SNAA135A – February 2012 – Revised April 2013
AN-2223 LMP8278Q VSSOP Evaluation Board
Copyright © 2012–2013, Texas Instruments Incorporated