Add to Signal Chain Designer

AD8557:  Digitally Programmable Sensor Signal Amplifier

Product Details

Product Status:Recommended for New Designs

The AD8557 is a zero drift, sensor signal amplifier with digitally programmable gain and output offset. Designed to easily and accurately convert variable pressure sensor and strain bridge outputs to a well defined output voltage range, the AD8557 accurately amplifies many other differential or single-ended sensor outputs. The AD8557 uses the ADI-patented low noise auto-zero and DigiTrim® technologies to create an accurate and flexible signal processing solution in a compact footprint.

Gain is digitally programmable in a wide range from 28 to 1300 through a serial data interface. Gain adjustment can be fully simulated in circuit and then permanently programmed with reliable polyfuse technology. Output offset voltage is also digitally programmable and is ratiometric to the supply voltage.

In addition to extremely low input offset voltage and input offset voltage drift and very high dc and ac CMRR, the AD8557 also includes a pull-up current source at the input pins and a pull-down current source at the VCLAMP pin. Output clamping set via an external reference voltage allows the AD8557 to drive lower voltage ADCs safely and accurately.

When used in conjunction with an ADC referenced to the same supply, the system accuracy becomes immune to normal supply voltage variations. Output offset voltage can be adjusted with a resolution of better than 0.4% of the difference between VDD and VSS. A lockout trim after gain and offset adjustment further ensures field reliability.

The AD8557 is fully specified from −40°C to +125°C. Operating from single-supply voltages of 2.7 V to 5.5 V, the AD8557 is offered in an 8-lead SOIC_N, and a 4 mm × 4 mm, 16-lead LFCSP_VQ.

Applications
  • Automotive sensors
  • Pressure and position sensors
  • Precision current sensing
  • Thermocouple amplifiers
  • Industrial weigh scales
  • Strain gages
  • FEATURES and BENEFITS

    • Very low offset voltage: 12 μV maximum over temperature
    • Very low input offset voltage drift: 65 nV/°C maximum
    • High CMRR: 96 dB minimum
    • Digitally programmable gain and output offset voltage
    • Gain range from 28 to 1300
    • Single-wire serial interface
    • Stable with any capacitive load
    • SOIC_N and LFCSP_VQ packages
    • 2.7 V to 5.5 V operation

    Functional Block Diagram for AD8557

    AEC-Q100 Qualified

    A version of this product is AEC-Q100 qualified. View the complete list of Operational Amplifiers and References qualified for Automotive applications.

    Documentation

    Title Content Type File Type
    AD8557: Digitally Programmable Sensor Signal Amplifier Data Sheet (Rev C, 06/2011) (pdf, 700 kB) Data Sheets PDF
    A Designer's Guide to Instrumentation Amplifiers (3rd Edition) Design Handbooks HTML
    Auto-Zero Amplifiers  (doc, 75 kB)
    A wide variety of electronic applications, especially those involving very small input signals, require signal paths with very low offset voltage and offset voltage drift over time and temperature.
    Technical Articles DOC
    High-performance Adder Uses Instrumentation Amplifiers
    Make an adder circuit using instrumentation amplifiers to increase input impedance.
    (EDN, 9/3/2009)
    Technical Articles HTML
    Leading Inside Advertorials: Applying Instrumentation Amplifiers Effectively–The Importance of an Input Ground Return  (pdf, 121 kB) Overview PDF
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary 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

    AD8557 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD8557ACPZ-R2 Status: Production 16 ld LFCSP (4x4mm, 2.35mm exposed pad) 16 Ind Reel, 250 $3.78 $3.78 Y  Material Info PCN Purchase
    AD8557ACPZ-REEL Status: Last Time Buy 16 ld LFCSP (4x4mm, 2.35mm exposed pad) 16 Ind Reel, 5000 - $2.23 Y  Material Info PCN/PDN Purchase
    AD8557ACPZ-REEL7 Status: Production 16 ld LFCSP (4x4mm, 2.35mm exposed pad) 16 Ind Reel, 1500 - $2.23 Y  Material Info PCN Purchase Sample
    AD8557ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $2.66 $2.13 Y  Material Info PCN Purchase
    AD8557ARZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $2.13 Y  Material Info PCN Purchase
    AD8557ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $2.13 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.

    AD8555/AD8556/AD8557 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD8556-EVALZ Status: Production Evaluatiion Board for AD8555/AD8556/AD8557 $66.00 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