INA21x

V+

OUT

GND

IN-

IN+

C

BYPASS

0.01mF

to

0.1mF

+2.7Vto+26V

REF

Reference

Voltage

Supply

Load

R

SHUNT

Output

R

1

R

3

R

2

R

4

INA210, INA211

INA212, INA213

INA214

www.ti.com

SBOS437E – MAY 2008 – REVISED JUNE 2013

APPLICATION INFORMATION

BASIC CONNECTIONS

Figure 23 shows the basic connections of the INA210-INA214. The input pins, IN+ and IN–, should be connected

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

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, two pins are provided for each input. These pins should be tied together (that is, tie IN+ to

IN+ and tie IN– to IN–).

POWER SUPPLY

The input circuitry of the INA210-INA214 can accurately measure beyond its power-supply voltage, V+. For

example, the V+ power supply can be 5V, whereas the load power supply voltage can be as high as +26V.

However, the output voltage range of the OUT terminal is limited by the voltages on the power-supply pin. Note

also that the INA210-INA214 can withstand the full –0.3V to +26V in the input pins, regardless of whether the

device has power applied or not.

The zero-drift offset performance of the INA210-INA214 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 100mV.

The INA210-INA214 series gives equivalent accuracy at a full-scale range on the order of 10mV. 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

gain INA213 or INA214 to accommodate larger shunt drops on the upper end of the scale. For instance, an

INA213 operating on a 3.3V supply could easily handle a full-scale shunt drop of 60mV, with only 100

μV of

offset.

Copyright © 2008–2013, Texas Instruments Incorporated

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