OPA333

OPA2333

SBOS351 − MARCH 2006

www.ti.com

9

Figure 4 shows the basic configuration for a bridge

amplifier.

are operational resistors used to isolate the ADS1100 from

16-bit converter, a precise reference is essential for

maximum accuracy. If absolute accuracy is not required,

and the 5V power supply is sufficiently stable, the

REF3130 may be omitted.

R

1

V

S

V

OUT

V

REF

R

1

OPA333

R

R

RR

+5V

Figure 4. Single Op Amp Bridge Amplifier

OPA333

ADS1100

Load

V

R

1

4.99k

Ω

R

3

4.99k

Ω

R

4

48.7k

Ω

R

2

4.99k

Ω

+5V

3V

REF3130

R

7

1.18k

Ω

R

SHUNT

1

Ω

R

6

71.5k

Ω

R

N

56

Ω

R

N

56

Ω

(PGA Gain = 4)

FS = 3.0V

1% resistors provide adequate common−mode rejection at small ground−loop errors.

Stray ground−loop reistance.

I

LOAD

Figure 5. Low-Side Current Monitor