INA271-HT datasheet(9/18 Pages) TI

9 / 18 page

Single-Pole Filter

Capacitor

+2.7V to +18V

5kW

96kW

PRE OUT

BUF IN

GND

OUT

IN-

IN+

V+

Load

-16V to +80V

Supply

INA271

0.01mF

0.1mF

INA271-HT

www.ti.com

SBOS521D – SEPTEMBER 2010 – REVISED AUGUST 2013

APPLICATIONS INFORMATION

BASIC CONNECTION

POWER SUPPLY

Figure 16 shows the basic connection of the IINA271.

The input circuitry of the INA271 can accurately

The input pins, IN+ and IN–, should be connected as

measure beyond its power-supply voltage, V+. For

closely as possible to the shunt resistor to minimize

example, the V+ power supply can be 5V, whereas

any resistance in series with the shunt resistance.

the load power-supply voltage is up to +80V. The

output voltage range of the OUT terminal, however, is

Power-supply bypass capacitors are required for

limited by the voltages on the power-supply pin.

stability. Applications with noisy or high-impedance

power supplies may require additional decoupling

SELECTING RS

capacitors to reject power-supply noise. Minimum

bypass capacitors of 0.01

μF and 0.1μF in value

The value chosen for the shunt resistor, RS, depends

should be placed close to the supply pins. Although

on the application and is a compromise between

not

mandatory,

additional

10mF

electrolytic

small-signal accuracy and maximum permissible

capacitor placed in parallel with the other bypass

voltage loss in the measurement line. High values of

capacitors

may

useful

applications

with

RS provide better accuracy at lower currents by

particularly noisy supplies.

minimizing the effects of offset, while low values of

RS minimize voltage loss in the supply line. For most

applications, 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 (VS – 0.2)/Gain.

Figure 16. INA271 Basic Connections

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