Datasheet

INA149
U1
+
19kΩ
380kΩ
20kΩ
380kΩ
380kΩ
B
REF
-IN
V-
+IN
A
REF
OUT
V
V+
NC
T1
V+
V-
GND
GND
10µF 10µF
10µF
V+V-
JMP1
C32 C31
C33
D1
D2D3
0.1µF
0.1µF
GND
GND
C2
C11
INA149EVM Hardware www.ti.com
2.3 Power Schematic
The power schematic is depicted in Figure 4. Power is applied to the INA149EVM through terminal block
T1. Reverse supply protection diodes (D2, D3) protect the device from accidental switching of the positive
and negative supply voltages. As a consequence, each supply voltage should be increased by one diode
voltage drop. Test points V+ and V– have been provided to ensure the desired supply voltage is being
applied to the device. D1 is a transient voltage suppressor (TVS) diode. D1 aids in protecting the INA149
from supply voltages in excess of 36 V (±18 V). JMP1 allows the user to short the negative supply voltage
(V–) to ground, which provides a simple method for operating the device with a single supply. Do not
shunt JMP1 during dual-supply operation because this action will short the negative supply to ground.
Capacitors C2 and C11 are placed as close to the device as possible to provide power-supply decoupling.
Figure 4. INA149EVM Power Schematic
6
INA149EVM SBOU119– November 2011
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