SLLSEN2B July   2015  – April 2016 ISO7840

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values
    9. 6.9  Electrical Characteristics—5-V Supply
    10. 6.10 Supply Characteristics—5-V Supply
    11. 6.11 Electrical Characteristics—3.3-V Supply
    12. 6.12 Supply Current Characteristics—3.3-V Supply
    13. 6.13 Electrical Characteristics—2.5-V Supply
    14. 6.14 Supply Current Characteristics—2.5-V Supply
    15. 6.15 Switching Characteristics—5-V Supply
    16. 6.16 Switching Characteristics—3.3-V Supply
    17. 6.17 Switching Characteristics—2.5-V Supply
    18. 6.18 Insulation Characteristics Curves
    19. 6.19 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Electromagnetic Compatibility (EMC) Considerations
    4. 8.4 Device Functional Modes
      1. 8.4.1 Device I/O Schematics
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 PCB Material
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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発注情報

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

9.1 Application Information

The ISO7840 device is a high-performance, quad-channel digital isolator with a 5.7-kVRMS isolation voltage. The device comes with enable pins on each side that can be used to put the respective outputs in high impedance for multi-master driving applications and reduce power consumption. The ISO7840 device uses single-ended CMOS-logic switching technology. The supply voltage range is from 2.25 V to 5.5 V for both supplies, VCC1 and VCC2. When designing with digital isolators, keep in mind that because of the single-ended design structure, digital isolators do not conform to any specific interface standard and are only intended for isolating single-ended CMOS or TTL digital signal lines. The isolator is typically placed between the data controller (that is, μC or UART), and a data converter or a line transceiver, regardless of the interface type or standard.

9.2 Typical Application

ISO7840 ISO7840F Apps_Circuits1_sllsen2.gif Figure 18. Isolated Data Acquisition System for Process Control

9.2.1 Design Requirements

For this design example, use the parameters shown in Table 3.

Table 3. Design Parameters

PARAMETER VALUE
Supply voltage 2.25 to 5.5 V
Decoupling capacitor between VCC1 and GND1 0.1 µF
Decoupling capacitor from VCC2 and GND2 0.1 µF

9.2.2 Detailed Design Procedure

Unlike optocouplers, which require external components to improve performance, provide bias, or limit current, the ISO7840 device only requires two external bypass capacitors to operate.

ISO7840 ISO7840F Typical_hook_up_SLLSEN2.gif Figure 19. Typical ISO7840 Circuit Hook-Up

9.2.3 Application Curve

The typical eye diagram of the ISO7840 device indicates low jitter and wide open eye at the maximum data rate of 100 Mbps.

ISO7840 ISO7840F Ch1_5p0_100M_PRBS_sllsej0.png Figure 20. Eye Diagram at 100 Mbps PRBS, 5 V and 25°C