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AD7170:  12-Bit Low Power Σ−Δ ADC

Product Details


The AD7170 is a very low power 12-bit analog-to-digital converter (ADC). It contains a precision 12-bit sigma-delta (Σ-Δ) ADC and an on-chip oscillator. Consuming only 135 μA, the AD7170 is particularly suitable for portable or battery operated products where very low power is a requirement. The AD7170 also has a power-down mode in which the device consumes 5 μA, thus increasing the battery life of the product.

For ease-of-use, all the features of the AD7170 are controlled by dedicated pins. Each time a data read occurs, eight status bits are appended to the 12-bit conversion. These status bits contain a pattern sequence that can be used to confirm the validity of the serial transfer. The output data rate of the AD7170 is 125 Hz, whereas the settling time is 24 ms. The AD7170 has one differential input and a gain of 1. This is useful in applications where the user needs to use an external amplifier to implement system-specific filtering or gain requirements.

The AD7170 operates with a power supply from 2.7 V to 5.25 V. It is available in a 10-lead LFCSP package.

The AD7171 is a 16-bit version of the AD7170. It has the same feature set as the AD7170 and is pin-for-pin compatible.

INTERFACE

  • 2-wire serial (read-only device)
  • SPI compatible
  • Schmitt trigger on SCLK

APPLICATIONS

  • Pressure measurement
  • Industrial process control
  • Portable instrumentation
  • FEATURES and BENEFITS

    • Output data rate: 125 Hz
    • Pin-programmable power-down and reset
    • Status function
    • Internal clock oscillator
    • Current: 135 μA
    • Power supply: 2.7 V to 5.25 V
    • –40°C to +105°C temperature range
    • Package: 10-lead 3 mm x 3 mm LFCSP

    Functional Block Diagram for AD7170

    Functional Block Diagram for AD7170
    Functional Block Diagram for AD7170

    Documentation

    Title Content Type File Type
    AD7170: 12-Bit Low Power Sigma-Delta ADC Data Sheet (Rev A, 09/2011) (pdf, 264 kB) Data Sheets PDF
    CN-0240: Bidirectional Isolated High-Side Current Sense with 270 V Common-Mode Rejection  (pdf, 336 kB) Circuit Note PDF
    UG-080: Evaluation Board for the AD7170 12-Bit, Low Power Sigma-Delta ADC  (pdf, 554 kB) User Guides PDF
    MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
    Industrial ICs
    Industrial ICs Solutions Bulletin, Volume 10, Issue 8
    Solutions Bulletins HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    BeMicro FPGA Project for CN0240 with Nios driver FPGA HDL HTML
    CN0240 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design FPGA HDL 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.

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    Companion Products

    Suggested Companion Products


    Recommended Driver Amplifier for the AD7170

    • For low noise, low distortion, differential amplifier, we recommend the ADA4941-1.
    • For a precision, general purpose, rail-to-rail, single-ended input, we recommend the AD8628 or the AD8631.
    Recommended Voltage References for the AD7170
    • For low noise, low power, 2.5V reference, we recommend the ADR381 or the ADR391.
    • Foe low noise, low power, 5.0V reference, we recommend the ADR395.
    Recommended Digital Isolators for the AD7170
    • For low cost, standard digital isolators, we recommend the ADuM1201 or the ADuM1301.
    Recommended Power Solutions
    • For selecting voltage regulator products, use ADIsimPower.

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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.

    AD7170 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    EVAL-AD7170EBZ Status: Production Evaluation Board $59.00 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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