OPA698

OPA698 OPA698 www.ti.com SBOS258D – NOVEMBER 2002 – REVISED DECEMBER 2008 Unity-Gain Stable, Wideband Voltage Limiting Amplifier FEATURES q HIGH LINEARITY NEAR LIMITING q FAST RECOVERY FROM OVERDRIVE: 1ns q LIMITING VOLTAGE ACCURACY: ±10mV q –3dB BANDWIDTH (G = +1): 450MHz q GAIN BANDWIDTH PRODUCT: 250MHz q SLEW RATE: 1100V/µs q ±5V AND +5V SUPPLY OPERATION q HIGH-GAIN VERSION AVAILABLE: OPA699 DESCRIPTION The OPA698 is a wideband, unity-gain stable voltagefeedback 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 APPLICATIONS q FAST LIMITING ANALOG-TO-DIGITAL CONVERTER (ADC) INPUT BUFFERS q CCD PIXEL CLOCK STRIPPING q VIDEO SYNC STRIPPING q HF MIXERS q IF LIMITING AMPLIFIERS q AM SIGNAL GENERATION q NONLINEAR ANALOG SIGNAL PROCESSING q OPA688 UPGRADE 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...