SBOS392I August   2007  – April 2026 REF33

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 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
  8. 7 Parameter Measurement Information
    1. 7.1 Thermal Hysteresis
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Start-Up Time
      2. 8.3.2 Low Temperature Drift
      3. 8.3.3 Power Dissipation
      4. 8.3.4 Noise Performance
    4. 8.4 Device Functional Modes
  10. 9 Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 REF3312 in a Bipolar Signal-Chain Configuration
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Op Amp Level-Shift Design
          2. 9.2.1.2.2 Differential Input Attenuator Design
          3. 9.2.1.2.3 Input Filtering
          4. 9.2.1.2.4 Component Selection
            1. 9.2.1.2.4.1 Voltage References
            2. 9.2.1.2.4.2 Op Amp
          5. 9.2.1.2.5 Input Attenuation and Level Shifting
          6. 9.2.1.2.6 Input Filtering
          7. 9.2.1.2.7 Passive Component Tolerances and Materials
        3. 9.2.1.3 Application Curves
          1. 9.2.1.3.1 DC Performance
          2. 9.2.1.3.2 AC Performance
    3. 9.3 Power-Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information
9.2.1.2.1 Op Amp Level-Shift Design

The ratio of R2, R3, and the VREF voltage determines the voltage on the output of the op amp when the differential input is 0V. Select the components so that VOUT is equal to the VREF / 2 voltage when VIN is equal to 0V, as shown in Equation 7.

Equation 7. A 1 + = V R E F 2 = R 3 R 2 + R 3 V R E F

where

  • VIN = 0V
  • R2 = R3

Solve for the value of R5 by setting R3 equal to R2 in Equation 5, as shown in Equation 8:

Equation 8. R 5 = R 2 × R 2 R 2 + R 2 = R 2 2 2 × R 2 = R 2 2