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AD8556:  Digitally Programmable Sensor Signal Amplifier with EMI Filters

Product Details


The AD8556 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 AD8556 accurately amplifies many other differential or single-ended sensor outputs. The AD8556 uses the ADI patented low noise auto-zero and DigiTrim® technologies to create an incredibly accurate and flexible signal processing solution in a very compact footprint.

Gain is digitally programmable in a wide range from 70 to 1,280 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. AD8556 also features internal EMI filters on the VNEG, VPOS, FILT and VCLAMP pins.

In addition to extremely low input offset voltage, low input offset voltage drift, and very high dc and ac CMRR, the AD8556 also includes a pull-up current source at the input pins and a pull-down current source at the VCLAMP pin. This allows open wire and shorted wire fault detection. A low-pass filter function is implemented via a single low cost external capacitor. Output clamping set via an external reference voltage allows the AD8556 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 AD8556 is fully specified from −40°C to +140°C. Operating from single-supply voltages of 2.7 V to 5.5 V, the AD8556 is offered in the 8-lead SOIC_N, and 4 mm × 4 mm 16-lead LFCSP_VQ.


Applications
  • Automotive Sensors
  • Pressure and Position Sensors
  • Precision Current Sensing
  • Strain Gages

FEATURES and BENEFITS

  • EMI filters at input pins
  • Specified from −40°C to +140°C
  • Low offset voltage: 10 μV maximum
  • Low input offset voltage drift: 65 nV/°C maximum
  • High CMRR: 94 dB minimum
  • Digitally programmable gain and output
    offset voltage
  • Programmable output clamp voltage
  • Open and short wire fault detection
  • Low-pass filtering
  • Single-wire serial interface
  • Stable with any capacitive load
  • SOIC_N and LFCSP_VQ packages
  • 4.5 V to 5.5 V operation

Functional Block Diagram for AD8556

Documentation

Title Content Type File Type
AD8556: Digitally Programmable Sensor Signal Amplifier with EMI Filters Data Sheet (Rev A, 12/2007) (pdf, 770 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

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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

AD8556 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8556ACPZ-R2 Status: Production 16 ld LFCSP (4x4mm, 2.35mm exposed pad) 16 Ind Reel, 250 $4.77 $4.77 Y  Material Info PCN Purchase
AD8556ACPZ-REEL Status: Last Time Buy 16 ld LFCSP (4x4mm, 2.35mm exposed pad) 16 Ind Reel, 5000 - $2.92 Y  Material Info PDN Purchase
AD8556ACPZ-REEL7 Status: Production 16 ld LFCSP (4x4mm, 2.35mm exposed pad) 16 Ind Reel, 1500 - $2.92 Y  Material Info PCN Purchase Sample
AD8556ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $3.78 $2.88 Y  Material Info PCN Purchase Sample
AD8556ARZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $2.88 Y  Material Info PCN Purchase
AD8556ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $2.88 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.

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.

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