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INA214AIDCKT Datasheet(PDF) 9 Page - Texas Instruments

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Part # INA214AIDCKT
Description  Voltage Output, High or Low Side Measurement, Bi-Directional Zero-Drift Series CURRENT SHUNT MONITOR
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

INA214AIDCKT Datasheet(HTML) 9 Page - Texas Instruments

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INPUT FILTERING
SHUTTING DOWN THE INA210-INA214
f
-
3dB =
f
-
3dB
1
2p (2 R
)C
FILTER
FILTER
LOAD
V
SUPPLY
R
SHUNT << RFILTER
R
<10W
FILTER
C
FILTER
R
<10W
FILTER
V+
OUT
Output
GND
IN-
IN+
INA21x
Reference
Voltage
C
BYPASS
0.01 F
m
to
0.1 F
m
+2.7Vto+26V
REF
R
1
R
3
R
2
R
4
INA21x
V+
OUT
GND
IN-
IN+
PRODUCT
R andR
3
4
INA210
INA211
INA212
INA213
INA214
5kW
2kW
1kW
20kW
10kW
C
BYPASS
NOTE:1M
pathsfromshuntinputstoreferenceandINA21xoutputs.
W
Shutdown
Control
REF
Reference
Voltage
1MW
R
3
R
2
R
4
Supply
Load
R
SHUNT
Output
GainError%=100
[100
{R/(R+R
)}]
-
FILT
´
(1)
INA210
,, INA211
INA212, INA213
INA214
www.ti.com............................................................................................................................................................... SBOS437A – MAY 2008 – REVISED JUNE 2008
SERIES
An obvious and straightforward location for filtering is
at the output of the INA210-INA214; however, this
While the INA210-INA214 series does not have a
location negates the advantage of the low output
shutdown pin, its low power consumption allows
impedance of the internal buffer. The only other
powering from the output of a logic gate or transistor
option for filtering is at the input pins of the
switch
that
can
turn
on
and
turn
off
the
INA210-INA214; this location requires consideration
INA210-INA214 power-supply quiescent current.
of the ±30% tolerance of the input impedance.
However, in current shunt monitoring applications.
Figure 24 shows a filter placed at the input pins.
there is also a concern for how much current is
drained from the shunt circuit in shutdown conditions.
Evaluating this current drain involves considering the
simplified
schematic
of
the
INA210-INA214
in
shutdown mode shown in Figure 25.
Figure 24. Input Filter
Using the lowest possible resistor values minimizes
both the initial shift in gain and effects of tolerance.
Figure 25. Basic Circuit for Shutting Down
The effect on initial gain is given by Equation 1:
INA210-INA214 with Grounded Reference
Note that there is typically slightly more than 1M
Where R is the value for R3 or R4 from Table 1 for the
impedance (from the combination of 1M
Ω feedback
model is in question.
and 5k
Ω input resistors) from each input of the
INA210-INA214 to the OUT pin and to the REF pin.
Table 1.
The amount of current flowing through these pins
PRODUCT
GAIN
R3 AND R4
depends on the respective ultimate connection. For
INA210
200
5k
example, if the REF pin is grounded, the calculation
INA211
500
2k
of the effect of the 1M
Ω impedance from the shunt to
ground is straightforward. However, if the reference
INA212
1000
1k
or op amp is powered while the INA210-INA214 is
INA213
50
20k
shut down, the calculation is direct; instead of
INA214
100
10k
assuming 1M
Ω to ground, however, assume 1MΩ to
the reference voltage. If the reference or op amp is
Using an INA212, for example, the total effect on gain
also shut down, some knowledge of the reference or
error can be calculated by replacing the R with
op amp output impedance under shutdown conditions
1k
Ω− 30%, (or 700Ω) or 1kΩ+ 30% (or 1.3kΩ). The
is required. For instance, if the reference source
tolerance extremes of RFILT can also be inserted into
behaves as an open circuit when it is unpowered,
the equation. If a pair of 100
Ω, 1% resistors are used
little or no current flows through the 1M
Ω path.
on the inputs, the initial gain error is approximately
2%.
Regarding the 1M
Ω path to the output pin, the output
stage of a disabled INA210-INA214 does constitute a
good path to ground; consequently, this current is
directly proportional to a shunt common-mode voltage
impressed across a 1M
Ω resistor.
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): INA210 INA211 INA212 INA213 INA214


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