OPA1678 Datasheet, PDF (19/41 Pages) Texas Instruments – Low-Distortion Audio Operational Amplifiers

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8 Application and Implementation
OPA1678, OPA1679
SBOS855 – FEBRUARY 2017
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
8.1.1 Capacitive Loads
The dynamic characteristics of the OPA167x series are optimized for commonly encountered gains, loads, and
operating conditions. The combination of low closed-loop gain and high capacitive loads decreases the phase
margin of the amplifier and can lead to gain peaking or oscillations. As a result, heavier capacitive loads must be
isolated from the output. The simplest way to achieve this isolation is to add a small resistor (R_S equal to 50 Ω,
for example) in series with the output.
This small series resistor also prevents excess power dissipation if the output of the device becomes shorted.
For more details about analysis techniques and application circuits, see the Feedback Plots Define Op Amp AC
Performance application report, available for download from the TI website (www.ti.com).
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: OPA1678 OPA1679
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