Sunday, August 5, 2012

Texas Instruments SBOA092A pdf datasheet download



Bruce Carter and Thomas R. Brown
While in the process of reviewing Texas Instruments applications notes, including those
from Burr-Brown – I uncovered a couple of treasures, this handbook on op amp
applications and one on active RC networks. These old publications, from 1963 and
1966, respectively, are some of the finest works on op amp theory that I have ever seen.
Nevertheless, they contain some material that is hopelessly outdated. This includes
everything from the state of the art of amplifier technology, to the parts referenced in the
document – even to the symbol used for the op amp itself:

These numbers in the circles referred to pin numbers of old op amps, which were potted
modules instead of integrated circuits. Many references to these numbers were made in
the text, and these have been changed, of course.
In revising this document, I chose to take a minimal approach to the material out of
respect for the original author, – Thomas R. Brown, leaving as much of the original
material intact as possible while making the document relevant to present day designers.
There were some sections that were deleted or substantially changed:
•= “Broadbanding” operational amplifier modules – replaced with discussion of uncompensated
operational amplifiers.
•= Open loop applications and Comparators – Applications showing an operational amplifier
used open loop, as a comparator have been deleted. At the time of original publication,
there were no dedicated comparator components. Good design techniques now dictate
using a comparator instead of an operational amplifier. There are ways of safely using an
operational amplifier as a comparator – if the output stage is designed to be used that way -
as in a voltage limiting operational amplifier – or if clamping is added externally that
prevents the output from saturating. These applications are shown.
•= Testing Operational Amplifiers – a section that had become hopelessly outdated. Testing
techniques are now tailored to the individual amplifier, to test for parameters important to its
intended purpose or target end equipment.

•= Some other application circuits were eliminated – if they were deemed impractical in the
light of today’s technology.
This handbook has also been reorganized to eliminate some redundancy, and place all
application circuits in one location.
The reader is cautioned that proper decoupling techniques should be followed with
operational amplifiers. Decoupling components are omitted from applications schematics
in this document for clarity. Consult reference 2 for proper decoupling techniques.
I also cleaned up grammatical and spelling mistakes in the original.
--- Bruce Carter, Texas Instruments Applications
(Excerpts from) Thomas Brown’s original Preface:
The purpose of this handbook is to provide a single source of information covering the proper
design of circuits employing the versatile modem operational amplifier. This manual will be
helpful to the experienced user of operational amplifiers, as well as the new user, in extending
the range of potential applications in which these devices can be used to advantage.
It is assumed that the reader will have a basic knowledge of electronics, but no particular
knowledge of operational amplifiers is needed to use this handbook. The operational amplifier is
treated as a circuit component inherently subject to certain rules of operation. The design of the
operational amplifiers themselves is considered only when necessary to describe their less
evident properties.
Readers with a working knowledge of operational amplifiers will want to refer directly to the
circuit collection. Readers whose job functions have not previously brought them in contact with
operational amplifiers will want to proceed directly through the handbook until the desired degree
of familiarity is obtained.
Refinements are continuously being made in the design and application of operational
amplifiers, yet the basic principles of application remain the same. Please do not hesitate to
contact Texas Instruments at any time with questions or comments arising from the use of this
handbook. It is, after all, intended for you, the user.
--- Thomas R. Brown, Jr.

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