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OPA692 Datasheet(PDF) 18 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
Part # OPA692
Description  Triple, Ultra-Wideband, Fixed-Gain, VIDEO BUFFER with Disable
PDF  31 Pages
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

OPA692 Datasheet(HTML) 18 Page - Burr-Brown (TI)

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HIGH-FREQUENCY ACTIVE FILTERS
9
6
3
0
-3
-6
-9
-12
-15
-18
-21
-24
1
10
100
1000
Frequency(MHz)
1/3
OPA3693
+5V
-5V
50W
50W
22pF
226W
100W
0W
Source
R
G
300W
R
F
300W
22pF
V
I
V
O
OPA3693
SBOS353 – DECEMBER 2006
This
type
of
filter
depends
on
a
low
output
impedance from the amplifier through very high
The extremely wide bandwidth of the OPA3693
frequencies to continue to provide an increasing
allows a wide range of active filter topologies to be
attenuation with frequency. As the amplifier output
implemented
with
minimal
amplifier
bandwidth
impedance rises with frequency, any input signal or
interaction in the filter shape. Sallen-Key filters, for
noise starts to feed directly through to the output via
example, using either a gain of +1V/V or gain of
the feedback capacitor. Because the OPA3693 used
+2V/V amplifier, may be easily implemented with no
in Figure 49 has a 650MHz bandwidth, the active
external gain setting elements. In general, given a
filter
continues
to
rolloff
through
frequencies
desired filter
ω
O, the amplifier should have at least
exceeding 200MHz. Figure 50 shows the frequency
20X that
ω
O to minimize filter interaction with the
response for the filter of Figure 49, where the desired
amplifier frequency response. Figure 49 illustrates an
40MHz cutoff is achieved and a 40dB/dec roll-off is
example gain of +2 line driver using the OPA3693
held through very high frequencies.
that incorporates a 40MHz low-pass Butterworth
response with just a few external components. The
filter resistor values have been adjusted slightly here
from an ideal filter analysis to account for parasitic
effects.
Figure 50. 40MHz Low-Pass Active Filter
Response
Figure 49. Line Driver with 40MHz Low-Pass
Active Filter
18
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