SNOSDM7A August   2025  – April 2026 OPA4H838-SEP

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics: VS = ±1.25 V to ±2.75 V (VS = 2.5 to 5.5 V)
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Operating Voltage
      2. 6.3.2 Input Voltage and Zero-Crossover Functionality
      3. 6.3.3 Input Differential Voltage
      4. 6.3.4 Internal Offset Correction
      5. 6.3.5 EMI Susceptibility and Input Filtering
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Bidirectional Current-Sensing
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curve
      2. 7.2.2 Single Operational Amplifier Bridge Amplifier
      3. 7.2.3 Programmable High-Side Current Source
      4. 7.2.4 Load Cell Measurement
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
      2. 8.1.2 Development Support
        1. 8.1.2.1 TINA-TI™ Simulation Software (Free Download)
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.2.3 Programmable High-Side Current Source

The OPA4H838-SEP can be configured as a programmable two-stage high-side current source as shown in Figure 7-4, in conjunction with the DAC121S101-SEP.

This circuit supplies adjustable current (0–100mA) to a ground-referenced load. The first stage sets a reference current based on the DAC output voltage. The second stage acts as a current mirror that scales the reference current and regulates the output through PMOS transistor Q2. Resistors RSET, RA, and RB set the output current based on the DAC voltage, while CCOMP, RISO, and RFB provide stability compensation

OPA4H838-SEP Two Stage Current Source Figure 7-4 Two Stage Current Source