INA210AIRSWR datasheet(15/44 Pages) TI1

15 / 44 page

ADC

Power Supply

Load

RSHUNT

CBYPASS

0.1 µF

5-V Supply

IN-

IN+

GND

V+

OUT

REF

Microcontroller

INA210, INA211, INA212, INA213, INA214, INA215

www.ti.com

SBOS437J – MAY 2008 – REVISED FEBRUARY 2017

Product Folder Links: INA210 INA211 INA212 INA213 INA214 INA215

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7.3 Feature Description

7.3.1 Basic Connections

Figure 23 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.

Figure 23. 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–).

7.3.2 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.

INA210AIRSWR Datasheet(PDF) 15 Page - Texas Instruments