LT1793 - Low Noise, Picoampere Bias Current, JFET Input Op Amp
Features
- Input Bias Current, Warmed Up: 10pA Max
- 100% Tested Low Voltage Noise: 8nV/rtHz Max
- A Grade 100% Temperature Tested
- Offset Voltage Over Temp: 1mV Max
- Input Resistance: 1013 ohms
- Very Low Input Capacitance: 1.5pF
- Voltage Gain: 1 Million Min
- Gain-Bandwidth Product: 4.2MHz Typ
- Guaranteed Specifications with ±5V Supplies
Typical Application
Description
The LT1793 achieves a new standard of excellence in noise performance for a JFET op amp. For the first time low voltage noise (6nV/rtHz) is simultaneously offered with extremely low current noise (0.8fA/rtHz), providing the lowest total noise for high impedance transducer applications. Unlike most JFET op amps, the very low input bias current (3pA typ) is maintained over the entire common mode range which results in an extremely high input resistance (1013 ohms). When combined with a very low input capacitance (1.5pF) an extremely high input impedance results, making the LT1793 the first choice for amplifying low level signals from high impedance transducers. The low input capacitance also assures high gain linearity when buffering AC signals from high impedance transducers. The LT1793 is unconditionally stable for gains of 1 or more, even with 1000pF capacitive loads. Other key features are 250µV VOS and a voltage gain over 4 million. Each individual amplifier is 100% tested for voltage noise, slew rate (3.4V/µs) and gain-bandwidth product (4.2MHz). Specifications at ±5V supply operation are also provided. For an even lower voltage noise please see the LT1792 data sheet.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 |
|---|---|---|---|---|---|
| LT1793ACN8#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LT1793ACS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1793ACS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1793AIN8#PBF | N-8 | N | I | 05-08-1510 (N8) | Yes |
| LT1793AIS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1793AIS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1793CN8#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LT1793CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1793CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1793IN8#PBF | N-8 | N | I | 05-08-1510 (N8) | Yes |
| LT1793IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1793IS8#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 | |
|---|---|---|---|---|---|---|
| LT1793ACN8#PBF | N-8 | C | $3.95 | $3.35 | Yes | |
| LT1793ACS8#PBF | SO-8 | C | $3.95 | $3.35 | Yes | |
| LT1793ACS8#TRPBF | SO-8 | C | $3.41 | Yes | ||
| LT1793AIN8#PBF | N-8 | I | $5.00 | $4.25 | Yes | |
| LT1793AIS8#PBF | SO-8 | I | $5.00 | $4.25 | Yes | |
| LT1793AIS8#TRPBF | SO-8 | I | $4.31 | Yes | ||
| LT1793CN8#PBF | N-8 | C | $2.75 | $2.25 | Yes | |
| LT1793CS8#PBF | SO-8 | C | $2.75 | $2.25 | Yes | |
| LT1793CS8#TRPBF | SO-8 | C | $2.31 | Yes | ||
| LT1793IN8#PBF | N-8 | I | $3.80 | $3.15 | Yes | |
| LT1793IS8#PBF | SO-8 | I | $3.80 | $3.15 | Yes | |
| LT1793IS8#TRPBF | SO-8 | I | $3.21 | 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
- Photocurrent Amplifiers
- Hydrophone Amplifiers
- High Sensitivity Piezoelectric Accelerometers
- Low Voltage and Current Noise Instrumentation Amplifier Front Ends
- Two and Three Op Amp Instrumentation Amplifiers
- Active Filters
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Design Tools
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LT1793
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.
