EVM Components
8
SBOU230 – October 2019
Copyright © 2019, Texas Instruments Incorporated
INA290EVM
5
EVM Components
This section summarizes the INA290EVM components. For these instructions, n is gain option 1, 2, 3, 4,
or 5.
5.1
R2_An, R3_An, R4_An, C2_An, C3_An
R2_An, R3_An, R4_An, are factory-installed 0-
Ω
0603 resistors.
C2_An, C3_An, are not populated.
Collectively, these pads allow user-defined filters for the input pins (IN+ and IN–) and the output pin (OUT)
of the INA290. If a filter is desired, remove these resistors and replace them with > 0-
Ω
SMT resistors and
populate the capacitor pads with capacitors. Consider the input bias current of the device when using
input filtering.
5.2
C1_An
C1_An is a 0.1-µF, power-supply bypass capacitor.
5.3
R1_An
R1_An is unpopulated, but allows the user to solder down a surface-mount shunt resistor between the
Vin+ and Vin– pads sensed by IN+ and IN– input pins. If used, make sure R1_An has proper power
dissipation for the selected current load. The chosen resistor must have a 2512 footprint.
5.4
U1_An (INA290)
U1_An is the location for the INA290An test device.
Consider these factors when selecting the appropriate device gain:
•
The differential input voltage is either applied across the inputs or developed based on the load current
that flows through the shunt resistor.
•
Make sure that the output voltage does not exceed the supply voltage. This limiting factor requires
attention to device selection.
•
The selected device must allow the output voltage to remain within the acceptable range after the
developed input voltage is amplified by the respective device gain. The output voltage must remain
within the device-specified swing limitations for response in the linear range.
•
An output below the minimum allowable output requires a device with a higher gain. Likewise, an
output above the maximum allowable output requires a device with a lower gain.
