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INA296A Datasheet(PDF) 26 Page - Texas Instruments

Part # INA296A
Description  INA296x –5 V to 110 V, Bidirectional, 1.1 MHz, 8 V/μs, Ultra-Precise Current Sense Amplifier
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

INA296A Datasheet(HTML) 26 Page - Texas Instruments

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9.3 Power Supply Recommendations
The INA296x makes accurate measurements beyond the connected power-supply voltage (VS) because the
inputs (IN+ and IN–) can operate anywhere between –5 V and +110 V independent of VS. For example, with the
VS power supply equal to 5 V, the common-mode voltage of the measured shunt can be as high as +110 V.
9.3.1 Power Supply Decoupling
Place the power-supply bypass capacitor as close to the supply and ground pins as possible. TI recommends a
bypass capacitor value of 0.1 μF. Additional decoupling capacitance can be added to compensate for noisy or
high-impedance power supplies.
9.4 Layout
9.4.1 Layout Guidelines
Attention to good layout practices is always recommended.
• Connect the input pins to the sensing resistor using a Kelvin or 4-wire connection. This connection technique
makes sure that only the current-sensing resistor impedance is detected between the input pins. Poor routing
of the current-sensing resistor commonly results in additional resistance present between the input pins.
Given the very low ohmic value of the current sense resistor, any additional high-current carrying impedance
can cause significant measurement errors.
• Place the power-supply bypass capacitor as close to the device power supply and ground pins as possible.
The recommended value of this bypass capacitor is 0.1 µF. Additional decoupling capacitance can be added
to compensate for noisy or high-impedance power supplies.
9.4.2 Layout Examples
VS
OUT
IN-
IN+
1
2
7
8
CBYPASS
INA Device
RSHUNT
VIA to Ground Plane
6
3
5
GND
4
NC
REF1
VIA to Ground Plane
REF2
VIA to Power Supply
VIA to Ground Plane
Figure 9-3. INA296x SOT-23 (DDF), SOIC (D) and VSSOP (DGK) Package Recommended Layout
INA296A, INA296B
SBOSA04C – MARCH 2022 – REVISED OCTOBER 2023
www.ti.com
26
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Copyright © 2023 Texas Instruments Incorporated
Product Folder Links: INA296A INA296B


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