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AD8655:  Low Noise, Precision CMOS Amplifier

Product Details

The AD8655/AD8656 are the industry’s lowest noise, precision CMOS amplifiers. They leverage the Analog Devices DigiTrim® technology to achieve high dc accuracy.

The AD8655/AD8656 provide low noise (2.7 nV/√Hz at 10 kHz), low THD + N (0.0007%), and high precision performance (250 μV max over VCM) to low voltage applications. The ability to swing rail-to-rail at the input and output enables designers to buffer analog-to-digital converters (ADCs) and other wide dynamic range devices in single-supply systems.

The high precision performance of the AD8655/AD8656 improves the resolution and dynamic range in low voltage applications. Audio applications, such as microphone pre-amps and audio mixing consoles, benefit from the low noise, low distortion, and high output current capability of the AD8655/AD8656 to reduce system level noise performance and maintain audio fidelity. The high precision and rail-to-rail input and output of the AD8655/ AD8656 benefit data acquisition, process controls, and PLL filter applications.

The AD8655/AD8656 are fully specified over the −40°C to +125°C temperature range. The AD8655/AD8656 are available in Pb-free, 8-lead MSOP and SOIC packages. The AD8655/ AD8656 are both available for automotive applications.


  • ADC and DAC buffers
  • Audio
  • Industrial controls
  • Precision Filters
  • Digital Scales
  • Automotive collision avoidance
  • PLL filters

    • Low Noise:
      2.7 nV/√rHz @ f = 10 kHz
    • Low offset voltage:
      250 μV max over Vcm
    • Low Distortion: 0.0008%
    • Offset voltage drift:
      0.4 μV/°C typ and 2.3 μV/°C max
    • Bandwidth: 28 MHz
    • Rail-to-rail Input/Output
    • Unity Gain Stable
    • 2.7 V to 5.5 V Operation
    • −40°C to +125°C Operation
    • Qualified for automotive applications

    Pin Configuration Diagram for AD8655


    Title Content Type File Type
    AD8655/AD8656: Low Noise, Precision CMOS Amplifier Data Sheet (Rev E, 10/2013) (pdf, 323 kB) Data Sheets PDF
    MS-2066: Low Noise Signal Conditioning for Sensor-Based Circuits  (pdf, 589 kB) Technical Articles PDF
    Demystifying Auto-Zero Amplifiers Part 2
    by Eric Nolan and Reza Moghimi (Analog Dialogue, May 2000)
    Technical Articles HTML
    SAR ADC & Driver Quick-Match Guide  (pdf, 251 kB)
    Find drivers for ADI's most popular single-ended and differential SAR ADCs based on your specific application conditions.
    Product Selection Guide PDF
    Industrial Applications Overview HTML
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    AD8655 SPICE Macro Model SPICE Models HTML

    Evaluation Kits & Symbols & Footprints

    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

    AD8655 Model Options
    Model Package Pins Temp.
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    AD8655ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $0.89 $0.71 Y  Material Info PCN Purchase Sample
    AD8655ARMZ-REEL Status: Production 8 ld MSOP 8 Ind Reel, 3000 - $0.71 Y  Material Info PCN Purchase
    AD8655ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $0.89 $0.71 Y  Material Info PCN Purchase Sample
    AD8655ARZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $0.71 Y  Material Info PCN Purchase
    AD8655ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $0.71 Y  Material Info PCN Purchase
    AD8655WARMZ-RL Status: Production MICRO SOIC 8 Auto Reel, 3000 - - 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.

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