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.