SBOS283E September   2003  – December 2024 REF1112

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
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
    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 Shunt Regulator
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
      2. 7.2.2 MicroPOWER 3μA, 1V Voltage Reference
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
      3. 7.2.3 2.5V Reference on 1μA
        1. 7.2.3.1 Design Requirements
        2. 7.2.3.2 Detailed Design Procedure
      4. 7.2.4 Adjustable Voltage Shunt Reference
      5. 7.2.5 Level Shift to Achieve Full ADC Input Range
      6. 7.2.6 Stable Current Source
    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 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

7.1 Application Information

Typical connections for the REF1112 are shown in Figure 7-1. A minimum 1μA bias current is required to maintain a stable output voltage and can be provided with a resistor connected to the supply voltage. IBIAS depends on the values selected for RBIAS and VS, and varies as a sum of the minimum operating current and the load current. To maintain stable operation, the value of RBIAS must be low enough to maintain the minimum operating current at the minimum and maximum load and supply voltage levels.

A 0.1μF load capacitor is recommended to maintain stability under varying load conditions. A minimum 0.01μF load capacitor is required for stable operation. Start-up time for the REF1112 is be affected, depending on the value of load capacitance and the bias currents being used. A 1μF power-supply bypass capacitor is recommended to minimize supply noise within the circuit. The REF1112 shunt voltage reference provides a versatile function for low power and space-conservative applications.