Datasheet

50W
V
I
-V
I
R
O
R
O
R
F
402W
R
F
402W
50W
R
G
1/2
OPA2690
1/2
OPA2690
V =1+
DIFF
V (- -V )
I I
2R
F
R
G
f =
O
(cutofffrequency)
1
2 R Cp´ ´ ´
R =R =0.65 R
R =0.375 R
C =C
C =2 C
1
´
´
´
2
3
1
2
6kW
R
2A
102W
C
1A
100pF
C
2
200pF
C
1B
100pF
R
1A
102W
R
1B
102W
R
3A
60W
R
3B
60W
50W
6kW
+12V
V
CM
V
CM
V
OUT
V
IN
1000pF
50W
1/2
OPA2690
1/2
OPA2690
R
2B
102W
OPA2690
SBOS238G –JUNE 2002–REVISED MARCH 2010 www.ti.com
SINGLE-SUPPLY MFB DIFFERENTIAL
ACTIVE FILTER: 10MHz BUTTERWORTH
CONFIGURATION
The active filter circuit shown in Figure 44 can be
easily implemented using the OPA2690. In this
configuration, each amplifier of the OPA2690
operates as an integrator. For this reason, this type of
application is also called infinite gain filter
implementation. A Butterworth filter can be
implemented using the following component ratios:
Figure 43. High-Speed Differential Receiver
(5)
Figure 44. Single-Supply, MFB Active Filter, 10MHz LP Butterworth
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Product Folder Link(s): OPA2690