1
SBOU232 – October 2019
Copyright © 2019, Texas Instruments Incorporated
DEM-OPA-SC-1A-EVM Evaluation Module
User's Guide
SBOU232 – October 2019
DEM-OPA-SC-1A-EVM Evaluation Module
1
Description
The DEM-OPA-SOT-1A demonstration fixture is a generic, unpopulated printed circuit board (PCB)
designed to provide an optimized layout when evaluating wideband operational amplifiers in the tiny SC70
package.
shows the package pinout for this PCB. For more information on these op amps, as
well as good PCB layout techniques, see the individual amplifier data sheets.
Only a few components are necessary to be assembled onto the board to set up the operational amplifier
in either an inverting or noninverting configuration. To avoid parasitic component inductance the board
only accepts surface mount resistors and capacitors. The actual values of the components, especially the
resistors, depend on the type of operational amplifier used and the intended mode of operation. The board
was designed to accommodate a variety of amplifiers: voltage feedback types or current feedback types.
The layout includes an optional function pin for those amplifiers featuring a disable function.
(top
layer view) illustrates that the user has the option to jumper the connection to the positive or negative
supply, or connect it to an external SMA connector.
For a detailed discussion on the individual op amp and the appropriate selection of the recommended
feedback and gain resistors, see the respective data sheets. As a reminder, the frequency response
performance of a current feedback amplifier is determined by the feedback resistor value. Also note that
the feedback resistor compensates for the package parasitics, and therefore its value usually varies for
different packages.