Datasheet LF155, LF156, LF256, LF257 LF355, LF356, LF357 (Texas Instruments)

制造商Texas Instruments
描述LFx5x J FET Input Operational Amplifiers
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LF155, LF156. , LF256. , LF257. LF355, LF356. , LF357. LFx5x JFET Input Operational Amplifiers. 1 Features. 2 Applications

Datasheet LF155, LF156, LF256, LF257 LF355, LF356, LF357 Texas Instruments

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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