Datasheet

APPLICATION INFORMATION
Basic Connection
R
S
Load
V
IN+
–16 V to +80 V
I
S
V
IN+
V
IN–
2.7 V to 18 V
V+
OUT
5 kΩ
INA193A–INA198A
5 kΩ
Power Supply
Accuracy Variations as a Result of V
SENSE
and Common-Mode Voltage
INA193A-Q1 , INA194A-Q1 , INA195A-Q1
INA196A-Q1 , INA197A-Q1 , INA198A-Q1
SBOS366C – AUGUST 2006 – REVISED OCTOBER 2008 ............................................................................................................................................... www.ti.com
Figure 1 shows the basic connection of the INA19xA. The input pins, V
IN+
and V
IN –
, should be connected as
closely as possible to the shunt resistor to minimize any resistance in series with the shunt resistance.
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.
Figure 1. INA19xA Basic Connection
The input circuitry of the INA19xA can accurately measure beyond its power-supply voltage, V+. For example,
the V+ power supply can be 5 V, whereas the load power-supply voltage is up to 80 V. The output voltage range
of the OUT terminal, however, is limited by the voltages on the power-supply pin.
The accuracy of the INA193A – INA198A current shunt monitors is a function of two main variables:
V
SENSE
(V
IN+
– V
IN –
) and common-mode voltage, V
CM
, relative to the supply voltage, V
S
. V
CM
is expressed as
(V
IN+
+ V
IN –
)/2; however, in practice, V
CM
is seen as the voltage at V
IN+
because the voltage drop across V
SENSE
is usually small.
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Product Folder Link(s): INA193A-Q1 INA194A-Q1 INA195A-Q1 INA196A-Q1 INA197A-Q1 INA198A-Q1