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AD626A Fiches technique(PDF) 11 Page - Analog Devices

No de pièce AD626A
Description  Low Cost, Single Supply Differential Amplifier
Download  12 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD626A Fiches technique(HTML) 11 Page - Analog Devices

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AD626
REV. C
–11–
SINGLE-POLE LOW-PASS FILTERING
A low-pass filter can be easily implemented by using the features
provided by the AD626.
By simply connecting a capacitor between Pin 4 and ground, a
single-pole low-pass filter is created, as shown in Figure 32.
CF
CORNER FREQUENCY OF FILTER =
1
2 CF (100k )
OUTPUT
+10V
+INPUT
–INPUT
0.1 F
1
2
3
4
8
7
6
5
–IN
+IN
G = 100
OUT
AD626
200k
200k
100k
G= 2
ANALOG
GND
–VS
FILTER
1/6
G=30
+VS
Figure 32. A One-Pole Low-Pass Filter Circuit Which
Operates from a Single +10 V Supply
CURRENT SENSOR INTERFACE
A typical current sensing application, making use of the large
common-mode range of the AD626, is shown in Figure 33. The
current being measured is sensed across resistor RS. The value
of RS should be less than 1 k
Ω 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
adjustable 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).
RG
RH
CF
OPTIONAL
LOW-PASS
FILTER
OUTPUT
+VS
CURRENT IN
CURRENT OUT
0.1 F
1
2
3
4
8
7
6
5
–IN
+IN
G = 100
OUT
AD626
200k
200k
100k
G= 2
ANALOG
GND
–VS
FILTER
1/6
G=30
+VS
0.1 F
–VS
RS
CURRENT
SENSOR
Figure 33. Current Sensor Interface
BRIDGE APPLICATION
Figure 34 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
G= 2
ANALOG
GND
–VS
FILTER
1/6
G=30
+VS
0.1 F
–5V
+VS
Figure 34. A Typical Bridge Application


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