Voltage Limiting Amplifiers

Burr-Brown's SpeedPLUS OPA688 and OPA689 are wideband, voltage limiting amplifiers (VLA) for op amp applications where the output should be strictly limited, overdrive recovery time is a concern, or where non-linear analog signal processing is needed. OPA688 is unity gain stable (G>+1); OPA689 is high gain stable (G> +4).

This opamp's output limiting architecture holds the limiter offset error to + 15mV, giving linear operation to within 30mV of the limits; and recovers quickly from output overdrive. Two buffered limiting voltages take control of the output voltage when it tries to go beyond these limits. The combination of narrow nonlinear range and low limiting offset allows the limiting voltages to be set within 100mV of the desired linear output range.

OPA688 features 530MHz bandwidth (G +1), 1000V/µs slew rate, and +20mV limiting voltage accuracy.

OPA689 features 280MHz bandwidth (G= +6), 1600V/µs slew rate, and + 20mV limiting voltage accuracy. Ideal for communications applications, both amplifiers are available in industry standard 8-pin PDIP and SO-8 packages.

Burr-Brown Corp., 6730 S. Tucson Blvd., Tucson, AZ 85706. Phone: 520-746-1111; Fax: 520-746-7401.