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AD8428:  Low Noise, Low Gain Drift, G = 2000 Instrumentation Amplifier

Product Details

Product Status:Recommended for New Designs

The AD8428 is an ultra-low noise instrumentation amplifier designed for accurately measuring tiny, high-speed signals. It delivers industry-leading gain-accuracy, noise and bandwidth.

All gain setting resistors for the AD8428 are internal to the part and precisely matched. Care is taken in both interconnects and symmetry. This results in excellent gain drift and quick settling to the final gain value after the part is powered on.

The high CMRR of the AD8428 prevents unwanted signals from corrupting the acquisition. The part’s pin-out is designed to avoid parasitic capacitance mismatches that can degrade CMRR at high frequencies.

The AD8428 is one of the fastest instrumentation amplifiers available. The circuit architecture is designed for high bandwidth at high gain: it uses current feedback topology for the initial pre-amp gain stage of 200, followed by a difference amplifier stage of 10. This results in a 3.5 MHz bandwidth at a gain of 2000, for an equivalent gain-bandwidth product of 7 GHz.

The AD8428 pinout allows access to internal nodes between the first and second stage. This feature can be useful to modify DC and AC parameters between the two amplification stages.

The AD8428 performance is specified over the industrial temperature range of −40°C to +85°C. It is available in an 8-lead plastic SOIC package.

APPLICATIONS

  • Sensor interface
  • Medical instrumentation
  • Patient monitoring

FEATURES and BENEFITS

  • Fixed gain of 2000
  • Access to internal nodes provides flexibility
  • Low noise: 1.5 nV/√Hz input voltage noise
  • High accuracy dc performance
    - Gain drift: 10 ppm/°C
    - Offset drift: 1 μV/°C
    - Gain accuracy: 0.2%
    - CMRR: 130 dB min
  • Excellent ac specifications
    -- Bandwidth: 3.5 MHz
    -- Slew rate: 40 V/μs
  • Power supply range:
    ±4 V to ±18 V
  • 8-pin SOIC package
  • ESD protection >5000 V (HBM)
  • Temperature range for specified performance:
    −40°C to +85°C
  • Operational up to 125°C

Functional Block Diagram for AD8428

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.

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Price, packaging, availability

AD8428 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8428ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $7.85 $6.60 Y  Material Info Notify Me Purchase Sample
AD8428ARZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 $7.85 $6.60 Y  Material Info Notify Me Purchase
AD8428BRZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $11.78 $9.90 Y  Material Info Notify Me Purchase Sample
AD8428BRZ-RL Status: Production 8 ld SOIC 8 Ind Reel, 2500 $11.78 $9.90 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.

AD62x, AD822x, AD842x Series InAmp Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-INAMP-62RZ Status: Production AD620/621/AD622/623/627/AD8223 SOIC Eval Board $40.23 Yes -
EVAL-INAMP-ICF-RMZ Status: Production AD8420/AD8237 MSOP Eval Board $34.58 Yes -
EVAL-INAMP-82RMZ Status: Production AD8220/8221/8226/8227/8228/8236/8421/8422 MSOP Eval Board $34.49 Yes -
EVAL-INAMP-82RZ Status: Production AD8221/8226/8227/8228/8229/8421/8422/8428/8429 SOIC Eval Board $34.49 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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