OPA277UA/2K5 参数 Datasheet PDF下载

V+

1/2

OPA2277

R

2

V–

V

OUT

= (V

1

– V

2

)(1 +

R

2

R

1

)

R–∆R

V

1

R+∆R

Load

Cell

R+∆R

V

2

R–∆R

V+

R

1

1/2

OPA2277

V–

R

2

R

1

For integrated solution see: INA126, INA2126 (dual)

INA125 (on-board reference)

INA122 (single-supply)

FIGURE 3. Load Cell Amplifier.

I

REG

∼

1mA

5V

12

V+

Type J

1/2

OPA2277

R

F

10kΩ

R

412Ω

13

V

LIN

V

IN

4

R

G

1250Ω

3

R

G

–

V

IN

+

1

I

R1

14

I

R2

11

10

V+

V

REG

R

G

XTR105

B

E

I

O

9

R

F

10kΩ

8

1kΩ

50Ω

25Ω

R

CM

= 1250Ω

1/2

OPA2277

V–

2

7

6

+

–

I

O

= 4mA + (V

IN

– V

IN

) 40

R

G

I

RET

(G = 1 +

0.01µF

2R

F

= 50)

R

FIGURE 4. Thermocouple Low Offset, Low Drift Loop Measurement with Diode Cold Junction Compensation.

®

9

OPA277, 2277, 4277