SNAS856 September   2024 REF80

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Thermal Information
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Heater
      2. 7.3.2 Buried Zener Reference
  9. 8 Parameter Measurement Information
    1. 8.1 Long-Term Stability
    2. 8.2 Temperature Drift
    3. 8.3 Noise Performance
      1. 8.3.1 1/f Noise
      2. 8.3.2 Broadband Noise
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Typical Application: Basic Voltage Reference Connection
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Application Curve
      2. 9.2.2 Typical Application Circuits
        1. 9.2.2.1 Precision Voltage Divider Connection
        2. 9.2.2.2 Calibration Signal
    3. 9.3 Power Supply Recommendation
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
  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

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9.2.2.1 Precision Voltage Divider Connection

Precision data converters typically require voltage reference which is less than or equal to 5V. REF80 requires a precision resistor divider followed by low noise buffer to generate reference voltage for data converters as shown in Figure 9-3.

The selection of resistor depends on the current capability (< 1mA is preferred) and noise requirement. Minimum value of resistors are decided by the output current as per Equation 4.

Equation 3. R 1   +   R 2 ≥   7.6 k Ω

Maximum value of the resistors are decided by the noise consideration. Thermal noise of the resistors (parallel equivalent) is added as per Equation 5

Equation 4. V R E F N o i s e   =   √ ( ( R 2 R 1   +   R 2 × R E F _ Z N o i s e ) 2 +   ( R 1 | | R 2 T h e r m a l   N o i s e ) 2

Where

  • VREFNoise = Reference noise requirement in desired frequency band
  • REF_ZNoise = REF80 noise in desired frequency band
  • R1||R2Thermal noise = Thermal noise of parallel equivalent of R1 and R2 resistor
R1 and R2 must be precision foil resistors with matched temperature drift for best performance.

REF80 Precision Resistor Divider Connection Figure 9-3 Precision Resistor Divider Connection
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