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

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

LTC6268 Typical Application
LTC6268 Typical Application

Description

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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC6268HS6#PBF SOT-23 S6 H 05-08-1636 Yes
LTC6268HS6#TRMPBF SOT-23 S6 H 05-08-1636 Yes
LTC6268HS6#TRPBF SOT-23 S6 H 05-08-1636 Yes
LTC6268HS8#PBF SO-8 S8 H 05-08-1610 (S8) Yes
LTC6268HS8#TRPBF SO-8 S8 H 05-08-1610 (S8) Yes
LTC6268IS6#PBF SOT-23 S6 I 05-08-1636 Yes
LTC6268IS6#TRMPBF SOT-23 S6 I 05-08-1636 Yes
LTC6268IS6#TRPBF SOT-23 S6 I 05-08-1636 Yes
LTC6268IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC6268IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LTC6268 Package Drawing
LTC6268 Package Drawing
LTC6268 Package Drawing
LTC6268 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC6268HS6#PBF SOT-23 H $4.79 Yes
LTC6268HS6#TRMPBF SOT-23 H $4.79 $3.44 Yes
LTC6268HS6#TRPBF SOT-23 H $4.72 $3.39 Yes
LTC6268HS8#PBF SO-8 H $4.65 $3.34 Yes
LTC6268HS8#TRPBF SO-8 H $4.72 $3.39 Yes
LTC6268IS6#PBF SOT-23 I $4.17 Yes
LTC6268IS6#TRMPBF SOT-23 I $4.17 $3.00 Yes
LTC6268IS6#TRPBF SOT-23 I $4.10 $2.95 Yes
LTC6268IS8#PBF SO-8 I $4.03 $2.90 Yes
LTC6268IS8#TRPBF SO-8 I $4.10 $2.95 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

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

Product Notifications

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Design Tools

LTspiceIV

LTspice® IV software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

Models for the following parts are available in LTspice IV:
LTC6268
LTC6268-10

Technical Support