11

®

ISO124

FIGURE 10. Single Supply Operation of the ISO124 Isolation Amplifier. For additional information refer to AB-009.

R

1

R

2

R

4

INA105

Difference Amp

R

3

R

S

2

3

4

IN4689

5.1V

Reference

5

7

6

1

V

IN

Signal Source

+

NOTE: (1) Select to match R .

NOTE: Since the amplifier is unity gain, the input

range is also the output range. The output can go

to –2V since the output section of the ISO amp

operates from dual supplies.

S

10k

Ω

15

–V

+V

V

16

–V

S1

Com 2

10

In

Gnd

(1)

V

S

(V)

20+

15

12

INPUT RANGE

–2 to +10

–2 to +5

–2 to +2

7

9

8

ISO124

2

1

V

FIGURE 9. Improved PSR Using External Regulator.

NOTE: The input supplies can be subregulated to ±5V to reduce

PSR related errors without reducing the ±10V input range.

10

7

9

8

2

V

OUT

+15V

–15V

V

±10V Swing

+5V

Regulator

MC78L05

–5V

Regulator

MC79L05

0.47µF 0.47µF

0.1µF

1

2

3

0.1µF

0.47µF

ISO124

3

1

2

16

1

DCP011515

7

6

5

21