FEATURES

High Linearity Near Limiting

Fast Recovery From Overdrive: 2.4 ns

Limiting Voltage Accuracy: ±15 mV

–3-dB Bandwidth (G = 6): 260 MHz

Stable for G ³ 4

Slew Rate: 1400 V/ms

±5-V and 5-V Supply Operation

High-Gain Version of OPA688

APPLICATIONS

Transimpedance With Fast Overdrive

Recovery

Fast Limiting ADC Input Buffers

Low Propagation Delay Comparator

Non-Linear Analog Signal Processing

Difference Amplifier

IF Limiting Amplifier

AM Signal Generation

DESCRIPTION/ORDERING INFORMATION

The OPA689 is a wideband, voltage-feedback operational amplifier that offers bipolar output voltage limiting, and

is stable for gains ³4. 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.