6.3 Feature Description

6.3.1 Basic Connections

Figure 6-1 shows the basic connections of the INA210-Q1 to INA215-Q1. 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

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Figure 6-1. Typical Application

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

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

close to the device pins.

6.3.2 Selecting RS

The zero-drift offset performance of the INA21x-Q1 family of devices offers several benefits. In general, 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-Q1 family of devices provides 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, some applications must measure current over a wide dynamic range and can take advantage

of the low offset on the low end of the measurement. Most often, these applications can use the lower-gain

INA213-Q1, INA214-Q1, or INA215-Q1 to accommodate larger shunt drops on the upper end of the scale. For

instance, an INA213-Q1 device operating on a 3.3-V supply can easily support a full-scale shunt drop of 60 mV,

with only 100 µV of offset.

INA210-Q1, INA211-Q1, INA212-Q1, INA213-Q1, INA214-Q1, INA215-Q1

SBOS475K – MARCH 2009 – REVISED NOVEMBER 2023

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