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AD1556:  Digital Filter/Decimator for 24-Bit Sigma-Delta A/D Converter

Product Details

The AD1555 is a complete sigma-delta modulator, combined with a programmable gain amplifier, intended for low frequency, high dynamic range measurement applications. The AD1555 outputs a ones-density bit stream proportional to the analog input. When used in conjunction with the AD1556 digital filter/decimator, the industry's highest performance ADC at a bandwidth of 1+ kHz is realized.

The continuous-time analog modulator input architecture avoids the need for an external anti-alias filter. The programmable gain front end simplifies system design, extends the dynamic range, and reduces system board area. Low operating power and standby modes makes the AD1555 ideal for remote battery-powered data acquisition systems.


  • FIR Digital Filter/Decimator
  • Serial or Parallel Selection of Configuration
  • Output Word Rates: 250 SPS to 16 kSPS
  • 6.2 mW Typ Low Power Dissipation
  • 70 µW in Standby Mode
  • Reference Design and Evaluation
    Board with Software Available

Functional Block Diagram for AD1556

Of Note ...

Customer Notice:If ordering the evaluation board for the AD1555 or AD1556 (Eval-AD1555/56EB), please note that software is only compatible with Windows 95 and 98.


Title Content Type File Type
AD1555/AD1556: 24-Bit Sigma-Delta ADC Data Sheet  (Rev B, 05/2002) (pdf, 429 kB) Data Sheets PDF
AN-566: A Geophone/Hydrophone Acquisition Reference Design  (pdf, 211 kB)
The AD1555/AD1556 24-Bit Sigma-Delta ADC Chipset Provides for Direct Acquisition of High Dynamic Range Sensors.
Application Notes PDF
AN-271: Build Precise S/H Amps for Fast 12-Bit ADCs  (pdf, 415 kB) Application Notes PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary 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.

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Price, packaging, availability

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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