OPA2890 datasheet(21/38 Pages) NSC

21 / 38 page

6kW

402W

128.7pF

257.4pF

128.7pF

402W

R3A

232W

R3B

232W

50W

6kW

+12V

OUT

1000pF

50W

1/2

OPA2890

1/2

OPA2890

402W

OPA2890

www.ti.com

SBOS364C – DECEMBER 2007 – REVISED DECEMBER 2009

Figure 58. Single-Supply, MFB Active Filter, 2MHz LP Butterworth

DESIGN-IN TOOLS

MACROMODELS

Computer simulation of circuit performance using

SPICE

often

useful

when

analyzing

the

DEMONSTRATION FIXTURES

performance of analog circuits and systems. This

Two printed circuit boards (PCBs) are available to

principle is particularly true for video and RF amplifier

assist in the initial evaluation of circuit performance

circuits where parasitic capacitance and inductance

using the OPA2890 in its two package options. Both

can have a major effect on circuit performance. A

of these are offered free of charge as unpopulated

SPICE model for the OPA2890 (use two OPA890

PCBs, delivered with a user’s guide. The summary

SPICE models) is available through the Texas

information for these fixtures is shown in Table 1.

Instruments web page (www.ti.com). This model does

a good job of predicting small-signal ac and transient

Table 1. Demonstration Fixtures by Package

performance under a wide variety of operating

conditions. It does not do as well in predicting the

LITERATURE

PRODUCT

PACKAGE

ORDERING NUMBER

NUMBER

harmonic distortion or dG/dP characteristics. This

OPA2890ID

SO-8

DEM-OPA-SO-2A

SBOU003

model does not attempt to distinguish between the

package types in small-signal ac performance.

OPA2890IDG

MSOP-10

DEM-OPA-MSOP-2B

SBOU040

The demonstration fixtures can be requested at the

Texas Instruments web site (www.ti.com) through the

OPA2890 product folder.

Submit Documentation Feedback

Product Folder Link(s): OPA2890

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