OPA689M

The OPA689 is a wideband, voltage-feedback operational amplifier that offers bipolar output voltage limiting, and is stable for gains ≥4. Two buffered limiting voltages take control of the output when it attempts to drive beyond these limits. This new output limiting architecture holds the limiter offset error to ±15 mV. The operational amplifier operates linearly to within 30 mV of the limits.

The combination of narrow nonlinear range and low limiting offset allows the limiting voltages to be set within 100 mV of the desired linear output range. A fast 2.4-ns recovery from limiting ensures that overdrive signals are transparent to the signal channel. Implementing the limiting function at the output, as opposed to the input, gives the specified limiting accuracy for any gain, and allows the OPA689 to be used in all standard operational amplifier applications.

Nonlinear analog signal processing circuits benefit from the OPA689's sharp transition from linear operation to output limiting. The quick recovery time supports high-speed applications.

The OPA689M is available in an industry-standard pinout in a CDIP-8 package. For lower gain applications requiring output limiting with fast recovery, consider the OPA688M.