LT1122 - Fast Settling, JFET Input Operational Amplifier

Features

  • 100% Tested Settling Time 340ns Typ to 1mV at Sum Node, 10V Step 540ns Max
  • Tested with Fixed Feedback Capacitor
  • Slew Rate 60V/μs Min
  • Gain-Bandwidth Product 14MHz
  • Power Bandwidth (20VP-P) 1.2 MHz
  • Unity-Gain Stable; Phase Margin 60°
  • Input Offset Voltage 600μV Max
  • Input Bias Current 25°C 75pA Max 70°C 600pA Max
  • Input Offset Current 25°C 40pA Max 70°C 150pA Max
  • Low Distortion

Typical Application

LT1122 Typical Application
LT1122 Typical Application

Description

The LT®1122 JFET input operational amplifier combines high speed and precision performance.

A unique poly-gate JFET process minimizes gate series resistance and gate-to-drain capacitance, facilitating wide bandwidth performance, without degrading JFET transistor matching.

It slews at 80V/μs and settles in 340ns. The LT1122 is internally compensated to be unity-gain stable, yet it has a bandwidth of 14MHz at a supply current of only 7mA. Its speed makes the LT1122 an ideal choice for fast settling 12-bit data conversion and acquisition systems.

The LT1122 offset voltage of 120μV, and voltage gain of 500,000 also support the 12-bit accurate applications.

The input bias current of 10pA and offset current of 4pA combined with its speed allow the LT1122 to be used in such applications as high speed sample and hold amplifiers, peak detectors, and integrators.

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
LT1122ACN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1122BCN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1122CCN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1122CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1122CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1122DCN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1122DS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1122DS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes


LT1122 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
LT1122ACN8#PBF N-8 C $5.50 $4.50 Yes
LT1122BCN8#PBF N-8 C $4.58 $3.70 Yes
LT1122CCN8#PBF N-8 C $3.50 $2.85 Yes
LT1122CS8#PBF SO-8 C $3.83 $3.10 Yes
LT1122CS8#TRPBF SO-8 C $3.16 Yes
LT1122DCN8#PBF N-8 C $3.00 $2.45 Yes
LT1122DS8#PBF SO-8 C $3.25 $2.65 Yes
LT1122DS8#TRPBF SO-8 C $2.71 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.

Part Number Description Price Documentation
DC417B DIP8, MS8, S8, SOT23-6 | Multi-Footprint General Purpose Board for Single Op. Amp $25.00
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Click here to view our complete list of demo boards

Applications

  • Fast 12-Bit D/A Output Amplifiers
  • High Speed Buffers
  • Fast Sample-and-Hold Amplifiers
  • High Speed Integrators
  • Voltage to Frequency Converters
  • Active Filters
  • Log Amplifiers
  • Peak Detectors

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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:
LT1122

Technical Support