4 EVM Components
This section summarizes the INA2191EVM components. For these instructions, n is gain option 1, 2, 3, 4, or 5.
4.1 R1n, R2n, R3n, R4n, R5n, R6n, C1n, C2n, C4n, C5n
R1n, R2n, R3n, R4n, R5n, R6n are factory-installed 0-Ω 0603 resistors.
C1n, C2n, C4n, C5n are not populated.
Collectively, these pads allow user-defined filters for the input pins (IN+ and IN–) and the output pins (OUT)
of the INA2191. If a filter is desired, remove these resistors and replace them with > 0-Ω SMT resistors and
populate the capacitor pads with capacitors.
4.1.1 J5n, J6n, JA1n, JA2n
These headers allow the user to quickly set voltage levels for the reference and enable pins.
4.2 C3n
C3n is a 0.1-µF, power-supply bypass capacitor for each INA2191 gain variant.
4.3 Rs1n and Rs2n (Rshunt)
Rshunt is unpopulated, but allows the user to solder down a surface-mount shunt resistor between the Rs+ and
Rs– pads sensed by IN+ and IN– input pins. If used, make sure Rshunt has proper power dissipation for the
selected current load and below 5 A. The chosen resistor must have a 1206 footprint.
4.3.1 R7n, R8n
These are populated 4.99 kΩ, 1%, 0603 resistors. They form a resistor divider network off the supply voltage
(Vs) to give the user a simple mid-supply voltage (Vs/2) that can be tied directly to the device's reference pins.
4.4 U1n (INA2191)
U1n is the location for the INA2191An 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.
4.5 S1n, S2n, S3n, S4n, S5n, S6n, S7n, S8n, S9n, SA1n, SA2n, SA3n, SA4n, SA5n, SA6n, SA7n,
SA8n, SA9n
These are unpopulated single pin receptacle connectors provide on-board test points. They can be populated
with solder termination as needed to allow for testing the INA2191 with various filters using through-hole
components.
EVM Components
SBOU254A – JANUARY 2021 – REVISED JUNE 2021
INA2191EVM
7
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