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OPA2690 Datasheet(PDF) 18 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
Part No. OPA2690
Description  Dual, Wideband, Voltage-Feedback OPERATIONAL AMPLIFIER with Disable
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Maker  BURR-BROWN [Burr-Brown (TI)]
Homepage  http://www.burr-brown.com
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OPA2690 Datasheet(HTML) 18 Page - Burr-Brown (TI)

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OPA2690
SBOS238D − JUNE 2002 − REVISED DECEMBER 2004
www.ti.com
18
The frequency response for a 10MHz Butterworth filter is
shown in Figure 10. One advantage for using this type of
filter is the independent setting of WO and Q. Q can be
easily adjusted by changing the R3A, B resistors without
affecting WO.
Frequency (MHz)
0.1
1
10
20
1
0
−1
−2
−3
−4
−5
−6
−7
−8
−9
Figure 10. Multiple Feedback Filter Frequency
Response
SINGLE-SUPPLY DIFFERENTIAL ADC
DRIVER
The single-supply differential ADC driver shown on the
front page is ideal for driving high-frequency ADCs. As
shown in the plot on the front page, Harmonic Distortion vs
Frequency for the Single-Supply Differential ADC Driver,
the 2nd-harmonic reacts as expected and drops to a
−95dBc at 1MHz and −87dBc at 5MHz—a significant
improvement in going to differential from single-ended.
The circuit shown on the front page has a 195MHz, −3dB
bandwidth that can be easily bandlimited by using a
capacitor in parallel with the feedback resistors. Refer to
Figure 11 for more details. The −3dB frequency is given by
Equation 5.
f*3dB +
1
2
pR
FCF
Frequency (MHz)
9
6
3
0
−3
−6
−9
−12
0.1
10
1500
100
C
F =8.6pF
Figure 11. Single-Supply Differential ADC Driver
For example, CF = 8.6pF in parallel with RF = 402Ω will
control the −3dB frequency to 18MHz.
DESIGN-IN TOOLS
DEMONSTRATION BOARDS
Several PC boards are available to assist in the initial
evaluation of circuit performance using the OPA2690 in its
two package styles. Both of these are available, free, as
unpopulated PC boards delivered with descriptive
documentation. The summary information for each board
is shown below:
PRODUCT
PACKAGE
BOARD PART
NUMBER
LITERATURE
REQUEST
NUMBER
OPA2690ID
SO-8
DEM-OPA268xU
SBOU003
OPA2690IDBV
SO-14
DEM-OPA268xN
SBOU002
Consult the Texas Instruments web site (www.ti.com) to
request either of these boards.
(5)


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