REF102

8

SBVS022B

www.ti.com

FIGURE 7. +10V Reference With Output Current Boosted to: a)

±20mA, b) +100mA, and c) I

L (TYP) +10mA, –5A.

Ω

–

+

OPA227

6

220

+10V

I

L

6

+10V

I

L

2N2905

6

+10V

I

L

4

REF102

V+

a)

−20mA < I

L < +20mA

(OPA227 also improves transient immunity)

b)

−5mA < I

L < +100mA

c) I

L (MAX) = IL (TYP) +10mA

I

L (MIN) = IL (TYP) −5mA

V

CC − 10V

I

L (TYP)

R

1 =

2

4

REF102

V+

2

4

REF102

V+

2

–

+

INA126

V

x100

2

4

6

+15V

−5V

–15V

357

1/2W

Ω

2

3

OPA227

–

+

357

1/2W

Ω

28mA

28.5mA

+5V

350

Strain

Gauge Bridge

Ω

5

10

8

R

G

OUT

6

REF102

V+

REF102

6

4

2

3

See SBVA007 for more details.

1

25k

Ω

25k

Ω

25k

Ω

25k

Ω

INA105

5

6

+10V

Out

−10V

Out

2

–

+

LOAD

I

OUT

Can be connected

to ground or

−V .

S

V+

REF102

2

6

4

OPA277

R

I

OUT =

, R

≥ 1kΩ

See SBVA001 for more details and I

SINK Circuit.

10V

R

FIGURE 8. Strain Gauge Conditioner for 350

Ω Bridge.

FIGURE 9.

±10V Reference.

FIGURE 10. Positive Precision Current Source.