1. Products
  2. Interface and Isolation
  3. Digital Isolation Technology
  4. SPI Isolators
  5. LTC6820

Data Sheet Rev. C
PDF
JP
User Guides
4 View All
Circuit Note
1 View All

Overview

Features and Benefits

  • AEC-Q100 Qualified for Automotive Applications
  • 1Mbps Isolated SPI Data Communications
  • Simple Galvanic Isolation Using Standard Transformers
  • Bidirectional Interface Over a Single Twisted Pair
  • Supports Cable Lengths Up to 100 Meters
  • Very Low EMI Susceptibility and Emissions
  • Configurable for High Noise Immunity or Low Power
  • Engineered for ISO26262 Compliant Systems
  • Requires No Software Changes in Most SPI Systems
  • Ultralow, 2µA Idle Current
  • Automatic Wake-Up Detection
  • Operating Temperature Range: –40°C to 125°C
  • 2.7V to 5.5V Power Supply
  • Interfaces to All Logic from 1.7V to 5.5V
  • Available in 16-Lead QFN and MSOP Packages

Product Details

The LTC6820 provides bidirectional SPI communications between two isolated devices through a single twisted-pair connection. Each LTC6820 encodes logic states into signals that are transmitted across an isolation barrier to another LTC6820. The receiving LTC6820 decodes the transmission and drives the slave bus to the appropriate logic states. The isolation barrier can be bridged by a simple pulse transformer to achieve hundreds of volts of isolation.

The LTC6820 drives differential signals using matched source and sink currents, eliminating the requirement for a transformer center tap and reducing EMI. Precision window comparators in the receiver detect the differential signals. The drive currents and the comparator thresholds are set by a simple external resistor divider, allowing the system to be optimized for required cable lengths and desired signal-to-noise performance.

Applications

  • Industrial Networking
  • Battery Monitoring Systems
  • Remote Sensors

Product Categories

Markets and Technologies

Comparable Parts Click to see all in Parametric Search

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (6)

Documentation & Resources

  • View All (15)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (4)
  • Safety and Regulatory Compliance (1)
  • Circuit Note (1)
  • Videos (1)
  • Technical Articles (5)
  • Webcasts (1)
    • Document Type

    Reference Designs (1)

    Product Recommendations

    LTC6820 Companion Parts

    Recommended Related Parts

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LTC6820HMS#3ZZPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC6820HMS#3ZZTRPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC6820HMS#PBF Material Declaration Reliability Data 16-Lead MSOP
    LTC6820HMS#TRPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC6820HUD#PBF Material Declaration Reliability Data 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC6820HUD#TRPBF Material Declaration Reliability Data 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC6820IMS#3ZZPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC6820IMS#3ZZTRPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC6820IMS#PBF Material Declaration Reliability Data 16-Lead MSOP
    LTC6820IMS#TRPBF Material Declaration Reliability Data 16-Lead MSOP
    LTC6820IUD#PBF Material Declaration Reliability Data 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC6820IUD#TRPBF Material Declaration Reliability Data 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    Wafer Fabrication Data R525 Reliability Data

    PCN-PDN Information

    Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

    Select Model for PCN Information
    • LTC6820HMS#3ZZPBF Production
    • LTC6820HMS#3ZZTRPBF Production
    • LTC6820HMS#PBF Production
    • LTC6820HMS#TRPBF Production
    • LTC6820HUD#PBF Production
    • LTC6820HUD#TRPBF Production
    • LTC6820IMS#3ZZPBF Production
    • LTC6820IMS#3ZZTRPBF Production
    • LTC6820IMS#PBF Production
    • LTC6820IMS#TRPBF Production
    • LTC6820IUD#PBF Production
    • LTC6820IUD#TRPBF Production

    Support & Discussions

    LTC6820 Discussions

    RE: LTC6804-2 IsoSPI communication issue
    6 day(s) ago in Power Management
    All LTC6820 Discussions
    LTC6820 Contact ADI Technical Support »
    LTC6820 Ask your question »
    LTC6820 Contact ADI Technical Support » LTC6820 Ask your question »

    Sample & Buy


    Ordering FAQs


    See our Ordering FAQs for answers to questions about online orders, payment options and more.

     

    Buy Now Pricing


    (**) Displayed Buy Now Price and Price Range is based on small quantity orders.

     

    List Pricing


    (*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

     

    Lead Times


    Please see the latest communication from our CCO regarding lead times.

     

    Sampling


    Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.


    Price Table Help

     

    Evaluation Boards

    Pricing displayed is based on 1-piece.

    Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

    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.

    •