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The OPA689 is a wideband, voltage feedback op ampthat offers bipolar output voltage limiTIng, and is stablefor gains ³ +4. Two buffered limiTIng voltages takecontrol of the output when it attempts to drive beyondthese limits. This new output limiTIng architecture holdsthe limiter offset error to ±15mV. The op amp operateslinearly to within 30mV of the limits.The combinaTIon of narrow nonlinear range and lowlimiting offset allows the limiting voltages to be set within100mV of the desired linear output range. A fast 2.4nsrecovery from limiting ensures that overdrive signals willbe transparent to the signal channel. Implementing thelimiting function at the output, as opposed to the input,gives the specified limiting accuracy for any gain, andallows the OPA689 to be used in all standard op ampapplications.Non-linear analog signal processing circuits will benefitfrom the OPA689’s sharp transition from linear operationto output limiting. The quick recovery time supports highspeed applications.The OPA689 is available in an industry-standard pinoutin PDIP-8 and SO-8 packages. For lower gain applicationsrequiring output limiting with fast recovery, considerthe OPA688.
