INA159-EP datasheet(9/18 Pages) TI

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APPLICATION INFORMATION

CM) + (V)) ) 5[(V)) * (0.5VREF)]

(3)

CM* + (V*) * 5[(0.5VREF) * (V*)]

(4)

COMMON-MODE RANGE

CM) + (V)) ) 5[(V)) * VREF]

(1)

CM* + (V*) * 5[VREF * (V*)]

(2)

INA159-EP

www.ti.com .......................................................................................................................................................................................... SBOS443 – NOVEMBER 2008

The internal op amp of the INA159 has a rail-to-rail

common-mode voltage capability at its inputs. A

rail-to-rail op amp allows the use of ±10-V inputs into

Some typical values are shown in Table 1.

a circuit biased to 1/2 of a 5-V reference (2.5-V

quiescent output). The inputs to the op amp will swing

Table 1. Common-Mode Range For Various

from approximately 400 mV to 3.75 V in this

Supply and Reference Voltages

application.

REF 1 and REF 2 Connected Together

The unique input topology of the INA159 eliminates

V+

−

VREF

VCM+

VCM−

the input offset transition region typical of most

rail-to-rail

complementary

stage

operational

–15

amplifiers. This allows the INA159 to provide superior

2.5

17.5

–12.5

glitch- and transition-free performance over the entire

1.25

23.75

–6.25

common-mode range.

1/2 Reference Connection

Good layout practice includes the use of a 0.1-

µF

V+

−

VREF

VCM+

VCM−

bypass capacitor placed closely across the supply

17.5

–12.5

pins.

4.096

19.76

–10.24

2.5

23.75

–6.25

3.3

11.55

–8.25

The common-mode range of the INA159 is a function

3.3

2.5

13.55

–6.25

of supply voltage and reference. Where both pins,

3.3

1.25

16.675

–3.125

REF1 and REF2, are connected together:

Where one REF pin is connected to the reference,

and

the

other

grounded

(1/2

reference

connection):

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