10

®

INA143, INA2143

SIMILAR COMPLETE

A1, A2

FEATURE

BURR-BROWN IA

OPA2227

Low Noise

INA103

OPA129

Ultra Low Bias Current (fA)

INA116

OPA2277

Low Offset Drift, Low Noise

INA114, INA128

OPA2130

Low Power, FET-Input (pA)

INA121

OPA2234

Single Supply, Precision, Low Power

INA122, INA118

OPA2237

Single Supply, Low Power, MSOP-8

INA122, INA126

The INA143 can be combined with op amps to form a complete instrumenta-

tion amplifier with specialized performance characteristics. Burr-Brown offers

many complete high performance IAs. Products with related performances

are shown at the right in the table below.

FIGURE 9. Precision G = 11 Buffer.

FIGURE 4. Difference Amplifier with Gain and CMR Adjust.

FIGURE 5. Precision G = –10 Inverting Amplifier.

This circuit follows an 11/1 divider with a gain of 11 for an overall gain of unity.

With an 11/1 divider, the input signal can exceed 55V without damage as

long as input current is less than 0.5mA.

FIGURE 6. Voltage Follower with Input Protection.

FIGURE 7. Precision Instrumentation Amplifier.

FIGURE 8. Precision Summing Amplifier.

10

Ω

10

Ω

10k

Ω

100k

Ω

10k

Ω

100k

Ω

200

Ω

200

Ω

V

1

V

2

2

3

5

1

6

V

O

Gain

Adjust

CMR

Adjust

INA143

To eliminate adjustment interactions,

first adjust gain with V

2 grounded.

V

2

25

6

INA143

3

V

O = –10 • V2

1

Gain Error = 0.05% maximum

Nonlinearity = 0.001% maximum

Gain Drift = 1ppm/

°C

10k

Ω

100k

Ω

10k

Ω

100k

Ω

25

6

INA143

3

R

3

10k

Ω

V

O = VIN

V

IN

R

1

10k

Ω

R

4

100k

Ω

1

R

2

100k

Ω

±55V

Without

Damage

V

1

–In

2

3

5

10k

Ω

100k

Ω

10k

Ω

100k

Ω

1

6

INA143

V

0 = 10 (1 + 2R2 /R1) (V2 – V1)

A

2

A

1

V

2

+In

R

1

R

2

V

O

R

2

25

6

INA143

V

1

R

1

10k

Ω

R

4

100k

Ω

1

R

2

100k

Ω

R

3

10k

Ω

3

V

3

V

O = V1 + 10 • V3

10k

Ω

100k

Ω

5

6

INA143

V

O = 11 • VIN

1

2

100k

Ω

10k

Ω

V

IN

3

Gain Error =

0.05% maximum