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INA211 Datasheet(PDF) 8 Page - Texas Instruments

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Part # INA211
Description  Voltage Output, High or Low Side Measurement, Bi-Directional Zer첩-Drift Series CURRENT SHUNT MONITOR
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

INA211 Datasheet(HTML) 8 Page - Texas Instruments

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APPLICATION INFORMATION
BASIC CONNECTIONS
UNIDIRECTIONAL OPERATION
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
BIDIRECTIONAL OPERATION
POWER SUPPLY
SELECTING RS
INA210
,, INA211
INA212, INA213
INA214
SBOS437 – MAY 2008 ....................................................................................................................................................................................................... www.ti.com
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
Figure 23 shows the basic connections of the
measurement. Most often, these applications can use
INA210-INA214. The input pins, IN+ and IN–, should
the lower gain INA213 or INA214 to accommodate
be connected as closely as possible to the shunt
larger shunt drops on the upper-end of the scale. For
resistor to minimize any resistance in series with the
instance, an INA213 operating on a 3.3V supply
shunt resistance.
could easily handle a full-scale shunt drop of 60mV,
with only 60
µV of offset.
Unidirectional operation allows the INA210-INA214 to
measure currents through a resistive shunt in one
direction. The most frequent case of unidirectional
operation sets the output at ground by connecting the
REF pin to ground. In unidirectional applications
where the highest possible accuracy is desirable at
very low inputs, bias the REF pin to a convenient
value above 50mV to get the device output swing into
the linear range for zero inputs.
A less frequent case of unipolar output biasing is to
bias the output by connecting the REF pin to the
supply; in this case, the quiescent output for zero
Figure 23. Typical Application
input is at quiescent supply. This configuration would
only respond to negative currents (inverted voltage
polarity at the device input).
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
Bidirectional operation allows the INA210-INA214 to
bypass capacitors close to the device pins.
measure currents through a resistive shunt in two
directions. In this case, the output can be set
anywhere within the limits of what the reference
inputs allow (that is, between 0V to V+). Typically, it
The
input
circuitry
of
the
INA210-INA214
can
is set at half-scale for equal range in both directions.
accurately measure beyond its power-supply voltage,
In some cases, however, it is set at a voltage other
V+. For example, the V+ power supply can be 5V,
than half-scale when the bidirectional current is
whereas the load power supply voltage can be as
nonsymmetrical.
high as +26V. However, the output voltage range of
the OUT terminal is limited by the voltages on the
The quiescent output voltage is set by applying
power-supply pin. Note also that the INA210-INA214
voltage to the reference input. Under zero differential
can withstand the full –0.3V to +26V in the input pins,
input conditions the output assumes the same voltage
regardless of whether the device has power applied
as is applied to the reference input.
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.
8
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): INA210 INA211 INA212 INA213 INA214


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