≤

≤

(A)

(A)

–

–

W

W

INA138-Q1

INA138-Q1, INA168-Q1

www.ti.com

SGLS174G – SEPTEMBER 2003 – REVISED JANUARY 2013

Figure 9. Basic Circuit Connections

OUTPUT VOLTAGE RANGE

current remains accurate within the compliance voltage range of the output circuitry. The shunt voltage and the

input common-mode and power-supply voltages limit the maximum possible output swing. The maximum output

voltage compliance is limited by the lower of the two equations below:

or

(whichever is lower)

BANDWIDTH

bandwidth, keep the capacitive load on the output to a minimum. Reduction in bandwidth due to capacitive load

is shown in the Typical Characteristics section.

If bandwidth limiting (filtering) is desired, a capacitor can be added to the output (see Figure 12). This does not

cause instability.

APPLICATIONS

The INA138-Q1 is designed for current-shunt measurement circuits, as shown in Figure 9, but its basic function

is useful in a wide range of circuitry. An engineer may find many unforeseen uses in measurement and level-

shifting circuits. A few ideas are illustrated in Figure 10 through Figure 15.

Copyright © 2003–2013, Texas Instruments Incorporated

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