The OPA698 is a wideband, unity-gain stable voltage-feedback op amp that offers bipolar output voltage limiting. 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 ±10mV. The op amp operates linearly to within 20mV of the output limit voltages.
The combination of a narrow nonlinear range and the low limiting offset allows the limiting voltages to be set within 100mV of the desired linear output range. A fast 1ns recovery from limiting ensures that overdrive signals will be 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 OPA698 to be used in all standard op amp applications.
Nonlinear analog signal processing will benefit from the ability of the OPA698 to sharply transition from linear operation to output limiting. The quick recovery time supports high-speed applications.
The OPA698 is available in an industry standard pinout SO-8 package. For higher gain, or transimpedance applications requiring output limiting with fast recovery, consider the OPA699.
HIGH LINEARITY NEAR LIMITING
FAST RECOVERY FROM OVERDRIVE: 1ns
LIMITING VOLTAGE ACCURACY: ±10mV
3dB BANDWIDTH (G = +1): 450MHz
GAIN BANDWIDTH PRODUCT: 250MHz
SLEW RATE: 1100V/µs
±5V AND +5V SUPPLY OPERATION
HIGH-GAIN VERSION AVAILABLE: OPA699
APPLICATIONS
FAST LIMITING ANALOG-TO-DIGITAL CONVERTER (ADC) INPUT BUFFERS
CCD PIXEL CLOCK STRIPPING
VIDEO SYNC STRIPPING
HF MIXERS
IF LIMITING AMPLIFIERS
AM SIGNAL GENERATION
NONLINEAR ANALOG SIGNAL PROCESSING
OPA688 UPGRADE
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