SBOS160A November   1993  – January 2015 ISO122

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
      1. 8.1.1 Modulator
      2. 8.1.2 Demodulator
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Isolation Amplifier
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Carrier Frequency Considerations
      2. 9.1.2 Isolation Mode Voltage Induced Errors
      3. 9.1.3 High IMV dV/dt Errors
      4. 9.1.4 High Voltage Testing
    2. 9.2 Typical Application
      1. 9.2.1 Output Filter
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Battery Monitor
      3. 9.2.3 Programmable Gain Amplifier
      4. 9.2.4 Thermocouple Amplifier
      5. 9.2.5 Isolated 4- to 20-mA Instrument Loop
      6. 9.2.6 Single-Supply Operation of the ISO122P Isolation Amplifier
      7. 9.2.7 Input-Side Powered ISO Amp
      8. 9.2.8 Powered ISO Amp With Three-Port Isolation
  10. 10Power Supply Recommendations
    1. 10.1 Signal and Supply Connections
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Trademarks
    2. 12.2 Electrostatic Discharge Caution
    3. 12.3 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • 100% Tested for High-Voltage Breakdown
  • Rated 1500 Vrms
  • High IMR: 140 dB at 60 Hz
  • Bipolar Operation: VO = ±10 V
  • 16-Pin Plastic DIP and 28-Lead SOIC
  • Ease of Use: Fixed Unity Gain Configuration
  • 0.020% Maximum Nonlinearity
  • ±4.5-V to ±18-V Supply Range

2 Applications

  • Industrial Process Control:
    • Transducer Isolator, Isolator for Thermocouples, RTDs, Pressure Bridges, and Flow Meters, 4-mA to 20-mA Loop Isolation
  • Ground Loop Elimination
  • Motor and SCR Control
  • Power Monitoring
  • PC-Based Data Acquisition
  • Test Equipment

3 Description

The ISO122 is a precision isolation amplifier incorporating a novel duty cycle modulation-demodulation technique. The signal is transmitted digitally across a 2-pF differential capacitive barrier. With digital modulation the barrier characteristics do not affect signal integrity, thus resulting in excellent reliability and good high-frequency transient immunity across the barrier. Both barrier capacitors are imbedded in the plastic body of the package.

The ISO122 is easy to use. No external components are required for operation. The key specifications are 0.020% maximum nonlinearity, 50-kHz signal bandwidth, and 200-V/°C VOS drift. A power supply range of 4.5 V to 18 V and quiescent currents of 5 mA on VS1 and ±5.5 mA on VS2 make the ISO122 ideal for a wide range of applications.

The ISO122 is available in 16-pin plastic DIP and
28-lead plastic surface-mount packages.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
ISO122 PDIP (16) 17.90 mm × 7.50 mm
SOIC (28) 20.01 mm × 6.61 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Simplified Schematic

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