AD8244
Info : RECOMMENDED FOR NEW DESIGNS
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AD8244

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 4
1ku List Price Starting From $2.13
Features
  • 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
Additional Details
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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
Part Models 4
1ku List Price Starting From $2.13

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD8244ARMZ
  • HTML
  • HTML
AD8244ARMZ-R7
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AD8244BRMZ
  • HTML
  • HTML
AD8244BRMZ-R7
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  • HTML
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

EVAL-AD8244

AD8244 Evaluation Board

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EVAL-AD8244

AD8244 Evaluation Board

AD8244 Evaluation Board

Product Detail

The evaluation board design is flexible to allow for common circuit options, including source impedance and space for output loading and filtering. Most resistors and capacitors use 0805 packages. The evaluation board accommodates the AD8244 quad FET-input buffer in a 10-lead MSOP.

 

The AD8244 data sheet should be consulted in conjunction with this evaluation board user guide UG-650.

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