SBOS074E September   1997  – June 2018 ISO124

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
      1. 7.1.1 Modulator
      2. 7.1.2 Demodulator
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Isolation Amplifier
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Carrier Frequency Considerations
      2. 8.1.2 Isolation Mode Voltage Induced Errors
      3. 8.1.3 High IMV dV/dt Errors
      4. 8.1.4 High Voltage Testing
    2. 8.2 Typical Applications
      1. 8.2.1 Output Filters
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Battery Monitor
      3. 8.2.3 Programmable Gain Amplifier
      4. 8.2.4 Thermocouple Amplifier
      5. 8.2.5 Isolated 4-mA to 20-mA Instrument Loop
      6. 8.2.6 Single-Supply Operation of the ISO124 Isolation Amplifier
      7. 8.2.7 Input-Side Powered ISO Amplifier
      8. 8.2.8 Powered ISO Amplifier With Three-Port Isolation
  9. 9 Power Supply Recommendations
    1. 9.1 Signal and Supply Connections
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • NVF|8
  • DVA|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.1 Signal and Supply Connections

Each power-supply pin should be bypassed with 1-µF tantalum capacitors located as close to the amplifier as possible. The internal frequency of the modulator/demodulator is set at 500 kHz by an internal oscillator. Therefore, if it is desired to minimize any feedthrough noise (beat frequencies) from a DC-DC converter, use a π filter on the supplies (see Figure 10). The ISO124 output has a 500-kHz ripple of 20 mV, which can be removed with a simple 2-pole low-pass filter with a 100-kHz cutoff using a low-cost op amp (see Figure 10).

The input to the modulator is a current (set by the 200-kΩ integrator input resistor) that makes it possible to have an input voltage greater than the input supplies, as long as the output supply is at least ±15 V. It is therefore possible, when using an unregulated DC-DC converter, to minimize PSR related output errors with ±5-V voltage regulators on the isolated side and still get the full ±10-V input and output swing.

ISO124 basic_signal_and_power_connections_sbos074.gifFigure 24. Basic Signal and Power Connections