Datasheet BUF802 (Texas Instruments)

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BUF802
SBOS998C – JUNE 2021 – REVISED MARCH 2022
BUF802 Wide-Bandwidth, 2.3 nV/√Hz, High-Input Impedance Buffer 1 Features 3 Description
• Large-signal bandwidth (1 VPP): 3.1 GHz The BUF802 device is an open-loop, unity gain • Slew rate: 7000 V/μs buffer with a JFET-input stage that offers low-noise, • Input voltage noise: 2.3 nV/√Hz high-impedance buffering for data acquisition system • 1% settling time: 0.7 ns (DAQ) front-ends. The BUF802 supports DC to 3.1 • Input-impedance: 50 GΩ || 2.4 pF GHz of bandwidth while offering excellent distortion • Capable of driving 50 Ω load and noise performance across the frequency range. • Adjustable quiescent current for power and The BUF802 may be used in a composite loop with performance trade-off a precision amplifier in applications where higher • Integrated input and output clamp with fast precision performance is required. The BUF802 uses overdrive recovery an innovative architecture to simplify the design of • Voltage supply: ±4.5 V to ±6.5 V high-precision, wide-bandwidth composite loops.
2 Applications
The BUF802 features an adjustable quiescent current • Oscilloscope front-end pin, which enables designers to trade bandwidth and • High-frequency data acquisition distortion for a lower quiescent current, thus making • High input-impedance and high slew rate T&M the part suitable across a wide-frequency range. The systems BUF802 has integrated input and output clamps to • Oscilloscope encoder and front-end add-on cards protect the device and its subsequent signal-chain • Active probes from overdrive voltages. • Non-destructive testing (NDT)
Device Information
(1) .
PART NUMBER PACKAGE BODY SIZE (NOM)
. BUF802 VQFN (16) 3.00 mm × 3.00 mm . (1) For all available packages, see the orderable addendum at the end of the data sheet. 0.8 . Input 0.6 Output . 0.4 ) + 6V 0.2 age (V olt 0 IN 50 Ω put V OUT -0.2 Out BUF802 -0.4 >1 G Impedance 50 Ω -0.6 -0.8 - 6V Time (500 ps/div)
Impedance Transformation Circuit Using BUF802 Transient Response
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 Electrical Characteristics: Wide Bandwidth Mode 6.6 Electrical Characteristics: Low Quiescent Current Mode 6.7 Typical Characteristics 7 Parameter Measurement Information 8 Detailed Description 8.1 Overview 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Input and Output Over-Voltage Clamp 8.3.2 Adjustable Quiescent Current 8.3.3 ESD Structure 8.4 Device Functional Modes 8.4.1 Buffer Mode (BF Mode) 8.4.2 Composite Loop Mode (CL Mode) 9 Application and Implementation 9.1 Application Information 9.2 Typical Application 9.2.1 Oscilloscope Front-End Amplifier Design 9.2.1.1 Design Requirements 9.2.1.2 Detailed Design Procedure 9.2.1.3 Application Curves 9.2.2 Transforming a Wide-Bandwidth, 50 Ω Input Signal Chain to High-Input Impedance 9.2.2.1 Detailed Design Results 9.2.2.2 Application Curves 10 Power Supply Recommendations 11 Layout 11.1 Layout Guidelines 11.2 Layout Example 12 Device and Documentation Support 12.1 Documentation Support 12.1.1 Related Documentation 12.2 Receiving Notification of Documentation Updates 12.3 Support Resources 12.4 Trademarks 12.5 Electrostatic Discharge Caution 12.6 Glossary 13 Mechanical, Packaging, and Orderable Information