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LTC6268 - 500MHz Ultra-Low Bias Current FET Input Op Amp

The LTC®6268/LTC6269 is a single/dual 500MHz FET-input operational amplifier with extremely low input bias current and low input capacitance. It also features low inputreferred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, CCD output buffers, and high-impedance sensor amplifiers. Its low distortion makes the LTC6268/LTC6269 an ideal amplifier for driving SAR ADCs.

It operates on 3.1V to 5.25V supply and consumes 16.5mA per amplifier. A shutdown feature can be used to lower power consumption when the amplifier is not in use.

The LTC6268 single op amp is available in 8-lead SOIC and 6-lead SOT-23 packages. The SOIC package includes two unconnected pins which can be used to create an input pin guard ring to protect against board leakage currents. The LTC6269 dual op amp is available in 8-lead MSOP with exposed pad and 3mm × 3mm 10-lead DFN packages. They are fully specified over the –40°C to 85°C and the –40°C to 125°C temperature ranges.

Features Gain Bandwidth Product: 500MHz –3dB Bandwidth (A = 1): 350MHz Low Input Bias Current: ±3fA Typ. Room Temperature 4pA Max at 125°C Current Noise (100kHz): 5.5fA/√Hz Voltage Noise (1MHz): 4.3nV/√Hz Extremely Low CIN 450fF Rail-to-Rail Output Slew Rate: 400V/μs Supply Range: 3.1V to 5.25V Quiescent Current: 16.5mA Harmonic Distortion (2VP-P): –100dB at 1MHz –80dB at 10MHz Operating Temp Range: –40°C to 125°C Single in 8-Lead SO-8, 6-Lead TSOT-23 Packages Dual in 8-Lead MS8, 3mm × 3mm 10-Lead DFN 10 Packages Typical Application

Applications Trans-Impedance Amplifiers ADC Drivers CCD Output Buffer Photomultiplier Tube Post-Amplifier Low IBIAS Circuits Packaging

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