Texas Instruments INA250EVM, User Manual

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IN+
IN-
VIN+
VIN-
REF
VS
OUT
GND
GND
IN+
IN-
VIN+
VIN-
REF
VS
OUT
0.1µF
C2
1µF
C1
V
S
G
N
D
0
R1
0
R2
DNP
C3
GND
REF OUT
VS
IN- IN+
SH+
VIN+
SH-
VIN-
VIN+
VIN-
SH-
SH+ REF
VS
GND
IN-
1
IN-
2
IN-
3
SH-
4
VIN-
5
GND
6
REF
7
GND
8
OUT
9
VS
10
GND
11
VIN+
12
SH+
13
IN+
14
IN+
15
IN+
16
U1
INA250A2PW
J1
108-0740-001
J2
108-0740-001
GND
GND
DNP
C4
DNP
C5
TPGnd3 TPGnd2
4
1
2
3
T1
ED555/4DS
OUT
Schematic, PCB Layout, and Bill of Materials
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3 Schematic, PCB Layout, and Bill of Materials
3.1 Schematic
Figure 2 shows the complete schematic of the INA250 test board. Components R1, R2, C3, C4, and C5
can be optionally added and replaced for an input filter. Keep the filter resistors to under 10 Ω to avoid
excessive additional gain error. Banana jack terminals J1 and J2 give access to the IN+ and IN– pins,
respectively. The VS, GND, REF, and OUT pins can be accessed through screw terminal block T1 or
through test points. All pins except for the shunt resistor Kelvin-connection pins (SH+ and SH–) are
accessible using test points. The SH+ and SH– pins are initially shorted to VIN+ and VIN–, respectively,
using 0-
Ω resistors R1 and R2.
Figure 2. INA250 Test Board Schematic
6 INA250EVM User's Guide SBOU153 – May 2015
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