INA210CIRSWR datasheet(13/50 Pages) TI2

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6.3 Feature Description

6.3.1 Basic Connections

Figure 6-1 shows the basic connections of the INA21x. Connect the input pins (IN+ and IN–) as closely as

possible to the shunt resistor to minimize any resistance in series with the shunt resistor.

ADC

Power Supply

Load

RSHUNT

CBYPASS

0.1 µF

5-V Supply

IN-

IN+

GND

V+

OUT

REF

Microcontroller

Figure 6-1. Typical Application

Power-supply bypass capacitors are required for stability. Applications with noisy or high-impedance power

supplies may require additional decoupling capacitors to reject power-supply noise. Connect bypass capacitors

close to the device pins.

On the RSW package options, two pins are provided for each input. Tie these pins together (that is, tie IN+ to

IN+ and tie IN– to IN–).

6.3.2 Selecting RS

The zero-drift offset performance of the INA21x offers several benefits. Most often, the primary advantage of

the low offset characteristic enables lower full-scale drops across the shunt. For example, non-zero-drift current

shunt monitors typically require a full-scale range of 100 mV.

The INA21x series gives equivalent accuracy at a full-scale range on the order of 10 mV. This accuracy reduces

shunt dissipation by an order of magnitude with many additional benefits.

Alternatively, there are applications that must measure current over a wide dynamic range that can take

advantage of the low offset on the low end of the measurement. Most often, these applications can use the

lower gains of the INA213, INA214, or INA215 to accommodate larger shunt drops on the upper end of the

scale. For instance, an INA213 operating on a 3.3-V supply can easily handle a full-scale shunt drop of 60 mV,

with only 100 μV of offset.

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INA210, INA211, INA212, INA213, INA214, INA215

SBOS437K – MAY 2008 – REVISED NOVEMBER 2023

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