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
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 |
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 | |
| Buy Now • Request Samples | ||||||
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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2414A | Un-Populated Demonstration Circuit; Supports 3 Channels of LTC6268 & LTC6268-10/LTC6226X | $25.00 | |
| Buy Now | |||
Applications
- Trans-Impedance Amplifiers
- ADC Drivers
- CCD Output Buffer
- Photomultiplier Tube Post-Amplifier
- Low IBIAS Circuits
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Design Tools
LTspice
LTspice® 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
Models for the following parts are available in LTspice:
LTC6268
LTC6268-10
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
