INA322EASLASH2K5 datasheet(9/18 Pages) TI2

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INA322

SBOS174B

APPLICATIONS INFORMATION

The INA322 is a modified version of the classic “two op amp”

instrumentation amplifier, with an additional gain amplifier.

Figure 1 shows the basic connections for the operation of the

INA322 and INA2322. The power supply should be capaci-

tively decoupled with 0.1

µF capacitors as close to the

INA322 as possible for noisy or high-impedance applica-

tions.

The output is referred to the reference terminal, which must

be at least 1.2V below the positive supply rail.

OPERATING VOLTAGE

The INA322 family is fully specified over a supply range of

+2.7V to +5.5V, with key parameters specified over the

temperature range of -55

°C to +125°C. Parameters that vary

significantly with operating conditions, such as load condi-

tions or temperature, are shown in the Typical Characteristic

Curves.

The INA322 may be operated on a single supply. Figure 2

shows a bridge amplifier circuit operated from a single +5V

supply. The bridge provides a small differential voltage

riding on an input common-mode voltage.

FIGURE 1. Basic Connections.

FIGURE 2. Bridge Amplifier of the INA322.

160k

Ω

40k

Ω

40k

Ω

160k

Ω

Also drawn in simplified form:

REF

0.1

µF

0.1

µF

IN–

IN+

V–

V+

O = ((VIN+) – (VIN –)) • G

Short V

OUT to RG

for G = 5

100

SHORT

100k

Ω

90k

Ω

190k

Ω

OPEN

100k

Ω

10k

Ω

10k

Ω

Shutdown

(For Single

Supply)

DESIRED GAIN

(V/V)

G = 5 + 5(R

2 / R1 )

INA322

OUT

V+

Shutdown

IN–

V–

IN+

REF

Bridge

Sensor

+5V

NOTE: (1) REF should be adjusted for the desired output level,

keeping in mind that the value of REF affects the common-mode

input range. See Typical Characteristic Curves.

INA322

OUT

V+

Shutdown

IN–

V–

IN+

REF(1)

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