AD626

–11–

CURRENT SENSOR INTERFACE

A typical current sensing application, making use of the large

common-mode range of the AD626, is shown in Figure 9. The

average differential voltage across this resistor is typically 100 mV.

To produce a full-scale output of +4 V, a gain of 40 is used adjust-

able by ±20% to absorb the tolerance in the sense resistor. Note

that there is sufficient headroom to allow at least a 10% overrange

(to +4.4 V).

CF

OPTIONAL

LOW-PASS

FILTER

OUTPUT

CURRENT IN

CURRENT OUT

0.1 F

1

2

3

4

8

7

6

5

–IN

+IN

G = 100

OUT

AD626

200k

200k

100k

ANALOG

GND

FILTER

1/6

0.1 F

CURRENT

SENSOR

G = 2

G = 30

Figure 9. Current Sensor Interface

BRIDGE APPLICATION

Figure 10 shows the AD626 in a typical bridge application. Here,

the AD626 is set to operate at a gain of 100, using dual-supply

voltages and offering the option of low-pass filtering.

CF

OPTIONAL

LOW-PASS

FILTER

OUTPUT

+5V

0.1 F

1

2

3

4

8

7

6

5

–IN

+IN

G = 100

OUT

AD626

200k

200k

100k

ANALOG

GND

FILTER

1/6

0.1 F

–5V

G = 30

G = 2

Figure 10. A Typical Bridge Application

REV. D