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
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 |
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 | ||
| 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 |
|---|---|---|---|
| DC417B | DIP8, MS8, S8, SOT23-6 | Multi-Footprint General Purpose Board for Single Op. Amp | $25.00 | |
| Buy Now | |||
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
- 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.
