Datasheet
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.
SELECTING R
S
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 100μV of
offset.
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