OPA2690IDBV BURR-BROWN [Burr-Brown Corporation], OPA2690IDBV Datasheet - Page 18

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

OPA2690
SBOS238D − JUNE 2002 − REVISED DECEMBER 2004
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 W
easily adjusted by changing the R
affecting W
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.
18
Figure 10. Multiple Feedback Filter Frequency
−1
−2
−3
−4
−5
−6
−7
−8
−9
1
0
0.1
O
.
f
*3dB
+
Response
Frequency (MHz)
2pR
1
1
F
C
F
3A, B
O
and Q. Q can be
resistors without
10
(5)
20
For example, C
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:
Consult the Texas Instruments web site (www.ti.com) to
request either of these boards.
Figure 11. Single-Supply Differential ADC Driver
OPA2690IDBV
OPA2690ID
PRODUCT
−12
−3
−6
−9
9
6
3
0
0.1
PACKAGE
F
= 8.6pF in parallel with R
SO-14
SO-8
1
C
F
Frequency (MHz)
= 8.6pF
DEM-OPA268xU
DEM-OPA268xN
BOARD PART
NUMBER
10
100
F
LITERATURE
www.ti.com
REQUEST
= 402Ω will
SBOU003
SBOU002
NUMBER
500