OPA3691 Datasheet, PDF (15/25 Pages) Burr-Brown (TI) – Triple Wideband, Current-Feedback OPERATIONAL AMPLIFIER With Disable

+5V
74HC238
D₁
D₂
Y₀
Y₁
Y₂
+5V
20Ω
1/3
OPA3691
Power-supply
decoupling not shown.
73.2Ω
191Ω
365Ω
20Ω
V_IN
1/3
68.1Ω
50Ω Load
50Ω
OPA3691
61.2Ω
274Ω
20Ω
1/3
OPA3691
20Ω
182Ω
63.4Ω
FIGURE 8. Wideband Programmable Gain.
DESIGN-IN TOOLS
APPLICATIONS SUPPORT
The Texas Instruments Applications Department is available
for design assistance at phone number 1-800-548-6132
(U.S.A./Canada only). The TI web site (www.ti.com) has the
latest data sheets and other design aids.
DEMONSTRATION BOARDS
A PC board will be available to assist in the initial evaluation
of circuit performance of the OPA3691. This is available as
an unpopulated PCB with descriptive documentation. See
the demonstration board literature for more information. The
summary information for this board is shown below:
PRODUCT
OPA3691IDBQ
OPA3691ID
PACKAGE
SSOP-16
SO-16
DEMONSTRATION
BOARD
DEM-OPA368xE
DEM-OPA368xU
LITERATURE
REQUEST
NUMBER
SBOU006
SBOU007
Check the TI web site (www.ti.com) for availability of these
boards.
–5V
SPICE MODELS
Computer simulation of circuit performance using SPICE is
often useful when analyzing the performance of analog
circuits and systems. This is particularly true for high-speed
active devices, like the OPA3691, where parasitic capaci-
tance and inductance can have a major effect on frequency
response.
SPICE models will be available through the TI web page or
on a disk (call our Applications Department). These models
do a good job of predicting small-signal AC and transient
performance under a wide variety of operating conditions.
They do not do as well in predicting the harmonic distortion
or differential gain and phase characteristics. These models
do not distinguish between the AC performance of different
package types.
OPERATING SUGGESTIONS
SETTING RESISTOR VALUES TO
OPTIMIZE BANDWIDTH
A current-feedback op amp like the OPA3691 can hold an
almost constant bandwidth over signal gain settings with the
proper adjustment of the external resistor values. This is
OPA3691
15
SBOS227A
www.ti.com