Texas Instruments INA-DUAL-2AMP-EVM, User Manual

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2.2 Single-Supply Configuration
2.2.1 Direct Reference Connection
Figure 2-2 shows an example of how to set up the EVM for single-supply operation with a direct voltage
connection to the reference pin.
TP14
TP17
R17
0
R12
0
R13
GND GND
GND GND
R19
C21
C18
C16
R11
V+
R8
R10
V-
V+
R21
R22
V-
GND
C15
V+
0.1µF
0
R14
0
GND GND
R16
C20
TP15
R15
VINA-
VINA+
RGA
RGA
1
2
3
4
U2
RefA
VOA
SenseA
V-
5
6
7
8
VINB-
VINB+
RGB
RGB
16
15
14
13
RefB
VOB
SenseB
V+
12
11
9
U3
GND
C22
V-
0.1µF
R32
GND
GND
GND GND
R38
C32
C30
C27 R31
V+
R30
V-
V+
R39
R40
V-
R35
R37
R33
R34
0
GND GND
R36
C31
TP21
C19
R28
C29
TP20
TP22
0
0
VOB VOA
VINA-
VINA+
VINB-
VINB+
10
+
–
+
–
TP10
TP18
REFA
GND
REFB
GND
VREFB
VREFA
GND
GND
V-
V+
TP1
C1
10µF
C2
1µF
C6
10µF
C7
1µF
TP11
GND
OAV-
OAV+
TP2
C3
10µF
C4
1µF
C8
10µF
C9
1µF
TP12
J1 J2
Instrumentation Amplifier
Power Supply
Operational Amplifier Power
Supply
TP8 TP9 TP23 TP24 TP4 TP5 TP6 TP7
1
2
3
1
2
3
Figure 2-2. Single-Supply Configuration, Direct Reference Connection
1. +VS to test point TP1
2. GND to test point TP11
3. Install jumper shunt to positions 2 and 3 on J1
4. Remove resistor R5 for REFA
a. Remove resistor R25 for REFB
5. Reference voltage to test point REFA (TP10)
a. Reference voltage to test point REFB (TP18)
6. Differential input signal connect to test points VinA– (TP14) and VinA+ (TP17) of channel A
a. Differential input signal connect to test points VinB– (TP20) and VinB+ (TP22) of channel B
7. Observe output at test point VOA (TP15)
a. Observe output at test point VOB (TP21)
Note
C15 and C22 are prepopulated with 0.1-µF power-supply decoupling capacitors. C22 is not required
to be removed for proper single-supply operation. See the respective device data sheet for additional
power-supply decoupling information.
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SBOU272 – NOVEMBER 2021
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