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INA138 Datasheet(PDF) 5 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Part # INA138
Description  High-Side Measurement CURRENT SHUNT MONITOR
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

INA138 Datasheet(HTML) 5 Page - Burr-Brown (TI)

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INA138, INA168
5
SBOS122C
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, V+ = 5V, VIN+ = 12V, and RL = 125kΩ, unless otherwise noted.
STEP RESPONSE
10
µs/div
200mV
G = 1
100mV
100mV
G = 1
0mV
50mV/div
STEP RESPONSE
10
µs/div
G = 25
0V
G = 10
0V
1V/div
500mV/div
OPERATION
Figure 1 illustrates the basic circuit diagram for both the
INA138 and INA168. Load current IS is drawn from supply VS
through shunt resistor RS. The voltage drop in shunt resistor
VS is forced across RG1 by the internal op amp, causing
current to flow into the collector of Q1. External resistor RL
converts the output current to a voltage, VOUT, at the OUT pin.
The transfer function for the INA138 is:
IO = gm (VIN+ – VIN– )(1)
where gm = 200µA/V.
In the circuit of Figure 1, the input voltage, (VIN+ – VIN– ), is
equal to IS • RS and the output voltage, VOUT, is equal to
IO • RL. The transconductance, gm, of the INA138 is
200
µA/V. The complete transfer function for the current
measurement amplifier in this application is:
VOUT = (IS) (RS) (200µA/V) (RL)(2)
The maximum differential input voltage for accurate mea-
surements is 0.5V, which produces a 100
µA output current.
A differential input voltage of up to 2V will not cause damage.
Differential measurements (pins 3 and 4) must be unipolar
with a more-positive voltage applied to pin 3. If a more-
negative voltage is applied to pin 3, the output current, IO, will
be zero, but it will not cause damage.
BASIC CONNECTION
Figure 1 shows the basic connection of the INA138. The
input pins, VIN+ and VIN– , should be connected as closely as
possible to the shunt resistor to minimize any resistance in
series with the shunt resistance. The output resistor, RL, is
shown connected between pin 1 and ground. Best accuracy
is achieved with the output voltage measured directly across
RL. This is especially important in high-current systems
where load current could flow in the ground connections,
affecting the measurement accuracy.
No power-supply bypass capacitors are required for stability
of the INA138. However, applications with noisy or high-
impedance power supplies may require decoupling capaci-
tors to reject power-supply noise. Connect bypass capacitors
close to the device pins.
POWER SUPPLIES
The input circuitry of the INA138 can accurately measure
beyond its power-supply voltage, V+. For example, the V+
power supply can be 5V, whereas the load power supply
voltage is up to +36V (or +60V with the INA168). The output
voltage range of the OUT terminal, however, is limited by the
lesser of the two voltages (see “Output Voltage Range” section).
SELECTING RS AND RL
The value chosen for the shunt resistor, RS, depends on the
application and is a compromise between small-signal accu-
racy and maximum permissible voltage loss in the measure-
ment line. High values of RS provide better accuracy at lower
currents by minimizing the effects of offset, while low values of
RS minimize voltage loss in the supply line. For most applica-
tions, best performance is attained with an RS value that
provides a full-scale shunt voltage range of 50mV to 100mV.
Maximum input voltage for accurate measurements is 500mV.
RL is chosen to provide the desired full-scale output voltage.
The output impedance of the INA138 OUT terminal is very
high which permits using values of RL up to 500kΩ with
excellent accuracy. The input impedance of any additional
circuitry at the output should be much higher than the value
of RL to avoid degrading accuracy.


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