OPA2890 Datasheet, PDF (21/38 Pages) Texas Instruments – Low-Power, Wideband, Voltage-Feedback OPERATIONAL AMPLIFIER with Disable

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OPA2890
R_1A
402W
V_IN
R_1B
402W
SBOS364C – DECEMBER 2007 – REVISED DECEMBER 2009
+12V
6kW
V_CM ^50W
1000pF
6kW
R3A
232W
1/2
OPA2890
C_1A
128.7pF
R_2A
402W
C₂
257.4pF
R_2B
402W
R3B
232W
C_1B
128.7pF
V_OUT
1/2
50W
OPA2890
V_CM
Figure 58. Single-Supply, MFB Active Filter, 2MHz LP Butterworth
DESIGN-IN TOOLS
DEMONSTRATION FIXTURES
Two printed circuit boards (PCBs) are available to
assist in the initial evaluation of circuit performance
using the OPA2890 in its two package options. Both
of these are offered free of charge as unpopulated
PCBs, delivered with a user’s guide. The summary
information for these fixtures is shown in Table 1.
Table 1. Demonstration Fixtures by Package
PRODUCT
OPA2890ID
OPA2890IDG
S
PACKAGE
SO-8
MSOP-10
ORDERING NUMBER
DEM-OPA-SO-2A
DEM-OPA-MSOP-2B
LITERATURE
NUMBER
SBOU003
SBOU040
The demonstration fixtures can be requested at the
Texas Instruments web site (www.ti.com) through the
OPA2890 product folder.
MACROMODELS
Computer simulation of circuit performance using
SPICE is often useful when analyzing the
performance of analog circuits and systems. This
principle is particularly true for video and RF amplifier
circuits where parasitic capacitance and inductance
can have a major effect on circuit performance. A
SPICE model for the OPA2890 (use two OPA890
SPICE models) is available through the Texas
Instruments web page (www.ti.com). This model does
a good job of predicting small-signal ac and transient
performance under a wide variety of operating
conditions. It does not do as well in predicting the
harmonic distortion or dG/dP characteristics. This
model does not attempt to distinguish between the
package types in small-signal ac performance.
Copyright © 2007–2009, Texas Instruments Incorporated
Product Folder Link(s): OPA2890
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