AD8244:  Single-Supply, Low Power, Precision FET Input Quad Buffer

Product Details

Product Status:Recommended for New Designs

The AD8244 is a precision, low power, FET input, quad unity-gain buffer that is designed to isolate very large source impedances from the rest of the signal chain. The 2 pA maximum bias current, near zero current noise, and 10 TΩ input impedance introduce almost no error, even with source impedance well into the megaohms.

Many traditional operational amplifier pinouts have a supply pin that is next to the noninverting input. A guard trace must be routed between these pins to avoid leakage currents much larger than the bias current of a FET input op amp. Guard traces can be routed between pins for large packages, such as DIP or even SOIC; however, the board area consumed by these packages is prohibitive for many modern applications. The AD8244 solves this problem with a unique pinout that physically separates the high impedance inputs from the low impedance supplies and outputs of the other buffers. This configuration simplifies guarding while reducing board space, allowing high performance and high density in the same design.

The AD8244 design is focused on solving problems specific to buffers. This includes close channel-to-channel matching which allows channels of the AD8244 to be used in differential signal chains with minimal error. With its low voltage noise, wide supply range, and high precision, the AD8244 is also flexible enough to provide high performance anywhere a unity-gain buffer is needed, even with low source resistance.

The AD8244 is specified over the industrial temperature range of −40°C to +85°C. It is available in a 10-lead MSOP package.

APPLICATIONS

  • Biopotential electrodes
  • Medical instrumentation
  • High impedance sensor conditioning
  • Filters
  • Photodiode amplifiers

FEATURES and BENEFITS

  • Low power
    250 μA maximum supply current per amplifier
  • FET input
    2 pA maximum input bias current at 25°C
    Extremely high input impedance
  • Low noise
    13 nV/√Hz voltage noise at 1 kHz
    0.4 μV p-p voltage noise
    (0.1 Hz to 10 Hz)
    0.8 fA/√Hz current noise at 1 kHz
  • High dc precision
    3 μV/°C maximum offset drift
    (B grade)
  • 3 MHz bandwidth
  • Unique pinout
    No leakage from inputs to supply pins
    Provides guarding capability
  • Rail-to-rail output
  • Single-supply operation
    Input range extends to ground
  • Wide supply range
    Single-supply: 3 V to 36 V
    Dual-supply: ±1.5 V to ±18 V
  • Available in a compact 10-lead MSOP

Pin Configuration Diagram for AD8244

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8244 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

AD8244 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8244ARMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $2.26 $1.81 Y  Material Info Notify Me Purchase Sample
AD8244ARMZ-R7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $1.81 Y  Material Info Notify Me Purchase
AD8244BRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $3.06 $2.45 Y  Material Info Notify Me Purchase Sample
AD8244BRMZ-R7 Status: Production MICRO SOIC 10 Ind Reel, 1000 - $2.45 Y  Material Info Notify Me 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.

AD8244 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8244-EVALZ Status: Production AD8244 Eval board for 10 -Lead MSOP $49.00 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.

Check Inventory & Purchase

View Sales and Distribution Offices

沪ICP备09046653号
content here.
content here.

Review this Product

Close