Datasheet LF155, LF156, LF256, LF257 LF355, LF356, LF357 (Texas Instruments)
| Manufacturer | Texas Instruments |
| Description | LFx5x J FET Input Operational Amplifiers |
| Pages / Page | 46 / 1 — LF155, LF156. , LF256. , LF257. LF355, LF356. , LF357. LFx5x JFET Input … |
| File Format / Size | PDF / 2.7 Mb |
| Document Language | English |
LF155, LF156. , LF256. , LF257. LF355, LF356. , LF357. LFx5x JFET Input Operational Amplifiers. 1 Features. 2 Applications
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Text Version of Document
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LF155, LF156 , LF256 , LF257 LF355, LF356 , LF357
SNOSBH0D – MAY 2000 – REVISED NOVEMBER 2015
LFx5x JFET Input Operational Amplifiers 1 Features 2 Applications
• Advantages • Precision High-Speed Integrators 1 – Replace Expensive Hybrid and Module FET • Fast D/A and A/D Converters Op Amps • High Impedance Buffers – Rugged JFETs Allow Blow-Out Free Handling • Wideband, Low Noise, Low Drift Amplifiers Compared With MOSFET Input Devices • Logarithmic Amplifiers – Excellent for Low Noise Applications Using • Photocell Amplifiers Either High or Low Source Impedance—Very • Sample and Hold Circuits Low 1/f Corner – Offset Adjust Does Not Degrade Drift or
3 Description
Common-Mode Rejection as in Most The LFx5x devices are the first monolithic JFET input Monolithic Amplifiers operational amplifiers to incorporate well-matched, – New Output Stage Allows Use of Large high-voltage JFETs on the same chip with standard Capacitive Loads (5,000 pF) Without Stability bipolar transistors (BI-FET™ Technology). These Problems amplifiers feature low input bias and offset currents/low offset voltage and offset voltage drift, – Internal Compensation and Large Differential coupled with offset adjust, which does not degrade Input Voltage Capability drift or common-mode rejection. The devices are also • Common Features designed for high slew rate, wide bandwidth, – Low Input Bias Current: 30 pA extremely fast settling time, low voltage and current noise and a low 1/f noise corner. – Low Input Offset Current: 3 pA – High Input Impedance: 1012 Ω
Device Information(1)
– Low Input Noise Current: 0.01 pA/√Hz
PART NUMBER PACKAGE BODY SIZE (NOM)
– High Common-Mode Rejection Ratio: 100 dB SOIC (8) 4.90 mm × 3.91 mm – Large DC Voltage Gain: 106 dB LFx5x TO-CAN (8) 9.08 mm × 9.08 mm PDIP (8) 9.81 mm × 6.35 mm • Uncommon Features – Extremely Fast Settling Time to 0.01%: (1) For all available packages, see the orderable addendum at the end of the data sheet. – 4 μs for the LFx55 devices – 1.5 μs for the LFx56
Simplified Schematic
– 1.5 μs for the LFx57 (AV = 5) – Fast Slew Rate: – 5 V/µs for the LFx55 – 12 V/µs for the LFx56 – 50 V/µs for the LFx57 (AV = 5) – Wide Gain Bandwidth: – 2.5 MHz for the LFx55 devices – 5 MHz for the LFx56 – 20 MHz for the LFx57 (AV = 5) – Low Input Noise Voltage: – 20 nV/√Hz for the LFx55 3 pF in LF357 series – 12 nV/√Hz for the LFx56 – 12 nV/√Hz for the LFx57 (AV = 5) 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 ESD Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information 6.5 AC Electrical Characteristics, TA = TJ = 25°C, VS = ±15 V 6.6 DC Electrical Characteristics, TA = TJ = 25°C, VS = ±15 V 6.7 DC Electrical Characteristics 6.8 Power Dissipation Ratings 6.9 Typical Characteristics 6.9.1 Typical DC Performance Characteristics 6.9.2 Typical AC Performance Characteristics 7 Detailed Description 7.1 Overview 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Large Differential Input Voltage 7.3.2 Large Common-Mode Input Voltage 7.4 Device Functional Modes 8 Application and Implementation 8.1 Application Information 8.2 Typical Application 8.2.1 Design Requirements 8.2.2 Detailed Design Procedure 8.2.3 Application Curves 8.3 System Examples 9 Power Supply Recommendations 10 Layout 10.1 Layout Guidelines 10.1.1 Printed-Circuit-Board Layout For High-Impedance Work 10.2 Layout Example 11 Device and Documentation Support 11.1 Related Links 11.2 Community Resources 11.3 Trademarks 11.4 Electrostatic Discharge Caution 11.5 Glossary 12 Mechanical, Packaging, and Orderable Information
LF155, LF156 , LF256 , LF257 LF355, LF356 , LF357
SNOSBH0D – MAY 2000 – REVISED NOVEMBER 2015
LFx5x JFET Input Operational Amplifiers 1 Features 2 Applications
• Advantages • Precision High-Speed Integrators 1 – Replace Expensive Hybrid and Module FET • Fast D/A and A/D Converters Op Amps • High Impedance Buffers – Rugged JFETs Allow Blow-Out Free Handling • Wideband, Low Noise, Low Drift Amplifiers Compared With MOSFET Input Devices • Logarithmic Amplifiers – Excellent for Low Noise Applications Using • Photocell Amplifiers Either High or Low Source Impedance—Very • Sample and Hold Circuits Low 1/f Corner – Offset Adjust Does Not Degrade Drift or
3 Description
Common-Mode Rejection as in Most The LFx5x devices are the first monolithic JFET input Monolithic Amplifiers operational amplifiers to incorporate well-matched, – New Output Stage Allows Use of Large high-voltage JFETs on the same chip with standard Capacitive Loads (5,000 pF) Without Stability bipolar transistors (BI-FET™ Technology). These Problems amplifiers feature low input bias and offset currents/low offset voltage and offset voltage drift, – Internal Compensation and Large Differential coupled with offset adjust, which does not degrade Input Voltage Capability drift or common-mode rejection. The devices are also • Common Features designed for high slew rate, wide bandwidth, – Low Input Bias Current: 30 pA extremely fast settling time, low voltage and current noise and a low 1/f noise corner. – Low Input Offset Current: 3 pA – High Input Impedance: 1012 Ω
Device Information(1)
– Low Input Noise Current: 0.01 pA/√Hz
PART NUMBER PACKAGE BODY SIZE (NOM)
– High Common-Mode Rejection Ratio: 100 dB SOIC (8) 4.90 mm × 3.91 mm – Large DC Voltage Gain: 106 dB LFx5x TO-CAN (8) 9.08 mm × 9.08 mm PDIP (8) 9.81 mm × 6.35 mm • Uncommon Features – Extremely Fast Settling Time to 0.01%: (1) For all available packages, see the orderable addendum at the end of the data sheet. – 4 μs for the LFx55 devices – 1.5 μs for the LFx56
Simplified Schematic
– 1.5 μs for the LFx57 (AV = 5) – Fast Slew Rate: – 5 V/µs for the LFx55 – 12 V/µs for the LFx56 – 50 V/µs for the LFx57 (AV = 5) – Wide Gain Bandwidth: – 2.5 MHz for the LFx55 devices – 5 MHz for the LFx56 – 20 MHz for the LFx57 (AV = 5) – Low Input Noise Voltage: – 20 nV/√Hz for the LFx55 3 pF in LF357 series – 12 nV/√Hz for the LFx56 – 12 nV/√Hz for the LFx57 (AV = 5) 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 ESD Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information 6.5 AC Electrical Characteristics, TA = TJ = 25°C, VS = ±15 V 6.6 DC Electrical Characteristics, TA = TJ = 25°C, VS = ±15 V 6.7 DC Electrical Characteristics 6.8 Power Dissipation Ratings 6.9 Typical Characteristics 6.9.1 Typical DC Performance Characteristics 6.9.2 Typical AC Performance Characteristics 7 Detailed Description 7.1 Overview 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Large Differential Input Voltage 7.3.2 Large Common-Mode Input Voltage 7.4 Device Functional Modes 8 Application and Implementation 8.1 Application Information 8.2 Typical Application 8.2.1 Design Requirements 8.2.2 Detailed Design Procedure 8.2.3 Application Curves 8.3 System Examples 9 Power Supply Recommendations 10 Layout 10.1 Layout Guidelines 10.1.1 Printed-Circuit-Board Layout For High-Impedance Work 10.2 Layout Example 11 Device and Documentation Support 11.1 Related Links 11.2 Community Resources 11.3 Trademarks 11.4 Electrostatic Discharge Caution 11.5 Glossary 12 Mechanical, Packaging, and Orderable Information
