LTC6268

RECOMMENDED FOR NEW DESIGNS

500MHz Ultra-Low Bias Current FET Input Op Amp

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Overview

  • 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

The LTC6268/LTC6269 is a single/dual 500MHz 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, 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.

Applications

  • Trans-Impedance Amplifiers
  • ADC Drivers
  • CCD Output Buffer
  • Photomultiplier Tube Post-Amplifier
  • Low IBIAS Circuits
LTC6268
500MHz Ultra-Low Bias Current FET Input Op Amp
20kΩ Gain 65MHz Trans-Impedance Amplifier 20kΩ TIA Frequency Response Product Package 1 Product Package 2 Product Package 3 Product Package 4
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Application Note 1

Technical Articles 5

Spec Notice 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC6268
  • LTC6268-10

Analog Photodiode Wizard

Use Photodiode Wizard to design a transimpedance amplifier circuit to interface with a photodiode. Select a photodiode from the library included in the tool, or enter custom photodiode specifications. Quickly observe tradeoffs between Bandwidth, Peaking (Q), and ENOB/SNR. Modify circuit parameters, and immediately see results in plots for pulse response, frequency response, and noise gain.

Open Tool

Signal Chain Designer

Signal Chain Designer is a web-based tool designed to create and simulate complex precision signal chains. See your circuit’s performance before you commit to your PCB: transfer function, noise, power consumption, input range, and DC error. Quickly experiment with different parts and architectures. Signal chains can be exported to LTspice for further analysis.

Open Tool

Analog Filter Wizard

Use the Analog Filter Wizard to design low-pass, high-pass, or band-pass filters with actual op amps in minutes. As you progress through the design process, you can observe the characteristics of your filter design from ideal specifications to real world circuit behavior. Quickly evaluate the tradeoffs in op amp specifications - including gain-bandwidth, noise, and supply current – to determine the best filter design for your requirements.

Open Tool
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC2414A

Un-Populated Demonstration Circuit; Supports 3 Channels of LTC6268 & LTC6268-10/LTC6226X

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Product Details

Demonstration Circuit 2414A has layouts for three channels of SOT-23 transimpedance amplifiers. Each of the three layouts applies different techniques achieving various parasitic feedback capacitances (CF). The upper channel, U3, assumes a low Transimpedance gain, has a parasitic CF of 0.1pF, and provides a footprint for an additional component CF in an 0402 footprint (C29). The lower channel, U1, assumes high transimpedance gain and was laid out to minimize CF, achieving approximately 7fF, although the real situation is more complex. The middle channel, U2, assumes a middle case. The outputs of the circuit are laid out for SMA edge connectors. The inputs consist of six pads per channel along the edge where a through-hole photodiode can be mounted, with provision for any photodiode pinout.
DC2414A
Un-Populated Demonstration Circuit; Supports 3 Channels of LTC6268 & LTC6268-10/LTC6226X
DC2414A Demo Board DC2414A Demo Board DC2414A Demo Board DC2414A Demo Board DC2414A - Schematic

Latest Discussions

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Which software to be used to open the PCB file of the DC2414A evaluation board for LTC6268-10?
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