OPA2690IDBV BURR-BROWN [Burr-Brown Corporation], OPA2690IDBV Datasheet - Page 17

• Manufacturer Part Number: OPA2690IDBV
• Description: Dual, Wideband, Voltage-Feedback OPERATIONAL AMPLIFIER with Disable
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

−V
V
I
I
Figure 8. High-Speed Differential Receiver
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R
G
50Ω
50Ω
O P A2 6 9 0
O P A2 6 9 0
1 /2
402Ω
402Ω
1 /2
R
R
F
F
Figure 9. Single-Supply, MFB Active Filter, 10MHz LP Butterworth
R
R
O
O
V
V
IN
DIFF
= 1 +
102Ω
102Ω
R
R
1A
1B
2R
R
G
F
1000pF
C
200pF
V
2
I
− (−V
V
CM
I
)
V
CM
6kΩ
60Ω
60 Ω
R
R
3A
3B
50 Ω
50Ω
SINGLE-SUPPLY MFB DIFFERENTIAL
ACTIVE FILTER: 10MHz BUTTERWORTH
CONFIGURATION
The active filter circuit shown in Figure 9 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:
6k Ω
f
R
R
C
C
O
102Ω
102Ω
R
R
1
3
1
2
+
2A
2B
+ R
+ 0.375
+ C
+ 2
OP A 2 6 90
OP A 2 6 90
+12V
2
1 /2
1 /2
100pF
100pF
2
C
C
+ 0.65
1A
1B
p
C
SBOS238D − JUNE 2002 − REVISED DECEMBER 2004
1
R
R
V
OUT
C
R
( cutoff frequency )
OPA2690
17