AD8643

PRODUCTION

Low Power, Rail-to-Rail Output, Precision JFET Quad Amplifier

Data Sheet (Rev. F) Product Selection Table
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Overview

  • Low supply current: 250 μA max
  • Very low input bias current: 1 pA max
  • Low offset voltage: 750 μV max
  • Single-supply operation: 5 V to 26 V
  • Dual-supply operation: ±2.5 V to ±13 V
  • Rail-to-rail output
  • Unity-gain stable

  • See datasheet for additional features

The AD8641 / AD8642 / AD8643 are low power, precision JFET input amplifiers featuring extremely low input bias current and rail-to-rail output. The ability to swing nearly rail-to-rail at the input and rail-to-rail at the output enables designers to buffer complementary metal-oxide semiconductor digital-to-analog converters (CMOS DACs), ASICs, and other wide output swing devices in single-supply systems. The outputs remain stable with capacitive loads of more than 500 pF.

The AD8641 / AD8642 / AD8643 are suitable for applications utilizing multichannel boards that require low power to manage heat. Other applications include photodiodes, ATE reference level drivers, battery management, and industrial controls.

The AD8641 / AD8642 / AD8643 are fully specified over the extended industrial temperature range of −40°C to +125°C. The AD8641 is available in 5-lead SC70 and 8-lead SOIC lead-free packages. The AD8642 is available in 8-lead MSOP and 8-lead SOIC lead-free packages. The AD8643 is available in 14-lead SOIC and 16-lead, 3 mm × 3 mm, LFCSP lead-free packages. 

Applications

  • Line-/battery-powered instruments
  • Photodiode amplifiers
  • Precision current sensing
  • Medical instrumentation
  • Industrial controls
  • Precision filters
  • Portable audio
  • ATE 
AD8643
Low Power, Rail-to-Rail Output, Precision JFET Quad Amplifier
AD8643 Functional Block Diagram
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Documentation

Data Sheet 3

Technical Articles 2

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • AD8643

Analog Photodiode Wizard

Use Photodiode Wizard to design a transimpedance amplifier circuit to interface with a photodiode. Select a photodiode from the library included in the tool, or enter custom photodiode specifications. Quickly observe tradeoffs between Bandwidth, Peaking (Q), and ENOB/SNR. Modify circuit parameters, and immediately see results in plots for pulse response, frequency response, and noise gain.

Open Tool

Signal Chain Designer

Signal Chain Designer is a web-based tool designed to create and simulate complex precision signal chains. See your circuit’s performance before you commit to your PCB: transfer function, noise, power consumption, input range, and DC error. Quickly experiment with different parts and architectures. Signal chains can be exported to LTspice for further analysis.

Open Tool

Analog Filter Wizard

Use the Analog Filter Wizard to design low-pass, high-pass, or band-pass filters with actual op amps in minutes. As you progress through the design process, you can observe the characteristics of your filter design from ideal specifications to real world circuit behavior. Quickly evaluate the tradeoffs in op amp specifications - including gain-bandwidth, noise, and supply current – to determine the best filter design for your requirements.

Open Tool

SPICE Model 1

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

EVAL-OPAMP-4

EVAL-OPAMP-4 Evaluation Board

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Product Details

The Universal Precision Op Amp Evaluation Boards has been designed and optimized for many circuit configurations allowing the users to best suit their applications. These boards are all RoHs Compliant. See references below on what board to order by lead count and package.

  • EVAL-PRAOPAMP-4RUZ (Quad 14-Lead TSSOP) RU-14
  • EVAL-PRAOPAMP-4RZ (Quad 14-Lead SOIC) R-14
EVAL-OPAMP-4
EVAL-OPAMP-4 Evaluation Board

Latest Discussions

2 Years Ago
Please let me know the input impedance.
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