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

8.2.1.2 Detailed Design Procedure

The ISO124 device is designed to have a 50-kHz single-pole (Butterworth) signal response. By cascading the ISO amp with a simple 50-kHz, Q = 1, two-pole, low-pass filter, the overall signal response becomes three-pole Butterworth. The result is a maximally flat 50-kHz magnitude response and the output ripple reduced below the noise level. Figure 10 shows the complete circuit. The two-pole filter is a unity-gain Sallen-Key type consisting of A1, R1, R2, C1, and C2. The values shown give Q = 1 and f–3dB bandwidth = 50 kHz. Because the op amp is connected as a unity-gain follower, gain and gain accuracy of the ISO amp are unaffected. Using a precision op amp such as the OPA602 also preserves the DC accuracy of the ISO amp.