AD626 查看數據表（PDF） - Analog Devices

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AD626

Low Cost, Single-Supply Differential Amplifier

Analog Devices 

AD626

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

current being measured is sensed across resistor RS. The value of

RS should be less than 1 k⍀ and should be selected so that 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).

CURRENT IN

CURRENT

SENSOR

RS

–IN 200k⍀

CURRENT OUT

1

200k⍀ +IN

8

2

ANALOG

GND

1/6

G = 30

RH

G = 100 7

RG

–VS

0.1␮F

CF

OPTIONAL

LOW-PASS

FILTER

3 –VS

100k⍀

FILTER

4

AD626

+VS 6

OUT

G=2

5

+VS

0.1␮F

OUTPUT

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.

+VS

–5V

0.1␮F

CF

OPTIONAL

LOW-PASS

FILTER

–IN 200k⍀

1

200k⍀ +IN

8

2

ANALOG

GND

1/6

G = 30

G = 100 7

3 –VS

100k⍀

FILTER

4

AD626

+VS 6

OUT

G=2

5

+5V

0.1␮F

OUTPUT

Figure 10. A Typical Bridge Application

REV. D

–11–

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