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.

  • 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
LTC6268 Typical Application
LTC6268 Typical Application
  • Trans-Impedance Amplifiers
  • ADC Drivers
  • CCD Output Buffer
  • Photomultiplier Tube Post-Amplifier
  • Low IBIAS Circuits
LTC6268 Package Drawing
LTC6268 Package Drawing
LTC6268 Package Drawing
LTC6268 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
Demo Boards
Part NumberDescriptionPrice
DC2414AUn-Populated Demonstration Circuit; Supports 3 Channels of LTC6268 & LTC6268-10/LTC6226X$25.00
Application Note
LT Journal
Press Release
CAD Symbol
Related Products
LTC6268/LTC6269 - 500MHz 超低偏置电流 FFT 输入运算放大器
LTC6268 - Dice Datasheet
LTC6268/LTC6269 - 500MHz Ultra-Low Bias Current FET Input Op Amp
面向 TIA 和缓冲器应用的毫微微安偏置电流运放可实现 500MHz 增益带宽
AN148 - Does Your Op Amp Oscillate?
Op Amp Combines Femtoamp Bias Current with 4GHz Gain Bandwidth Product, Shines New Light on Photonics Applications
Transimpedance Amplifiers for Wide Range Photodiodes Have Challenging Requirements
Femtoamp Bias Current Op Amps Achieve 500MHz Gain Bandwidth for TIA & Buffer Applications
LTC6268 Footprints and Symbols