Dual 4GHz Ultra-Low Bias Current FET Input Op Amp

The LTC6268-10/LTC6269-10 is a single/dual 4GHz FET-input operational amplifier with extremely low input bias current and low input capacitance. It also features low input-referred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, and high-impedance sensor amplifiers. It is a decompensated op amp that is gain-of-10 stable.

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 LTC6268-10 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 LTC6269-10 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.

Applications

* Transimpedance Amplifiers

* ADC Drivers

* Photomultiplier Tube Post-Amplifier

* Low IBIAS Circuits

* Gain Bandwidth Product: 4GHz

* Low Input Bias Current:

* ±3fA Typ. Room Temperature

* 4pA Max at 125°C

* Current Noise (100kHz): 7fA/√Hz

* Voltage Noise (1MHz): 4.0nV/√Hz

* Extremely Low CIN 0.45pF

* Rail-to-Rail Output

* AV ≥10

* Slew Rate: +1500V/μs, –1000V/μs

* Supply Range: 3.1V to 5.25V

* Quiescent Current: 16.5mA

* 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