The OPA688 is a wideband, unity gain stable voltagefeedback op amp that offers bipolar output voltage limiting.Two buffered limiting voltages take control of theoutput when it attempts to drive beyond these limits.This new output limiting architecture holds the limiteroffset error to ±15mV. The op amp operates linearly towithin 30mV of the output limit voltages.The combination of narrow nonlinear range and lowlimiting offset allows the limiting voltages to be setwithin 100mV of the desired linear output range. A fast2.4ns recovery from limiting ensures that overdrive signalswill be transparent to the signal channel. Implementingthe limiting function at the output, as opposed tothe input, gives the specified limiting accuracy for anygain, and allows the OPA688 to be used in all standardop amp applications.Non-linear analog signal processing will benefit fromthe OPA688’s sharp transition from linear operation tooutput limiting. The quick recovery time supports highspeed applications.The OPA688 is available in an industry standard pinoutin 8-pin PDIP and SO-8 packages. For higher gain, ortransimpedance applications requiring output limitingwith fast recovery, consider the OPA689.
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