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AD8642:  Low Power, Rail-to-Rail Output, Precision Dual JFET Op Amp

Product Details


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 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

FEATURES and BENEFITS

  • 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
  • No Phase Reversal

Pin Configuration Diagram for AD8642

Documentation

Title Content Type File Type
AD8641/AD8642/AD8643: Low Power, Rail-to-Rail Output, Precision JFET Amplifiers Data Sheet  (Rev E, 09/2011) (pdf, 377 kB) Data Sheets PDF
Biopotential Electrode Sensors in ECG/EEG/EMG Systems  (pdf, 122 kB) White Papers PDF
Biopotential Electrode Sensors in ECG/EEG/EMG Systems  (pdf, 122 kB) Technical Articles PDF
Biopotential Electrode Sensors in ECG/EEG/EMG Systems  (pdf, 122 kB) Technical Documentation PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8642 SPICE Macro Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD8642 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8642ARMZ Status: Production MICRO SOIC 8 Ind Tube, 50 $2.93 $2.35 Y  Material Info PCN Purchase Sample
AD8642ARMZ-REEL Status: Production 8 ld MSOP 8 Ind Reel, 3000 $2.93 $2.35 Y  Material Info PCN Purchase
AD8642ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $2.93 $2.35 Y  Material Info PCN Purchase
AD8642ARZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $2.35 Y  Material Info PCN Purchase
AD8642ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $2.35 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

EVAL-OPAMP-2 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-PRAOPAMP-2CPZ Status: Production Dual CP-8 lead LFCSP Evaluation Board $20.19 Yes -
EVAL-PRAOPAMP-2RMZ Status: Production Dual RM-8 lead MSOP Evaluation Board $20.19 Yes -
EVAL-PRAOPAMP-2RZ Status: Production Dual R-8 lead SOIC Evaluation Board $20.19 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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