SNVSCN7A November   2023  – December 2023 REF54

PRODUCTION DATA  

  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  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics REF54250
    6. 6.6  Electrical Characteristics REF54300
    7. 6.7  Electrical Characteristics REF54410
    8. 6.8  Electrical Characteristics REF54450
    9. 6.9  Electrical Characteristics REF54500
    10. 6.10 Typical Characteristics
  8. 7 Parameter Measurement Information
    1. 7.1 Temperature Drift
    2. 7.2 Long-Term Stability
    3. 7.3 Noise Performance
      1. 7.3.1 1/f Noise
      2. 7.3.2 Broadband Noise
    4. 7.4 Thermal Hysteresis
    5. 7.5 Solder Heat Shift
    6. 7.6 Power Dissipation
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 EN Pin
      2. 8.3.2 NR Pin
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Basic Voltage Reference Connection
        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 Reference Attach With High Precision ADC
    3. 9.3 Power Supply Recommendation
    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

9.2.2 Reference Attach With High Precision ADC

High precision ADCs require external precision voltage references to achieve the best SNR and gain drift with temperature and time. REF54 has flat dynamic impedance at lower frequency. However it's dynamic impedance increases for higher sampling rate. A low noise - low offset buffer with good bandwidth helps to improve THD and droop performance to achieve > 18 bit ENOB at higher sampling rate. Figure 9-7 shows evaluation circuit for ADS1285. Figure 9-5 and Figure 9-6 show the peak to peak code variation for constant DC input of 0 V and 2.08 V respectively. The performance meets data sheet specifications of ADS1285 with REF54.

GUID-20231206-SS0I-NDND-H5KZ-JRZCPK6FMMZW-low.svg Figure 9-4 REF54 Attach With ADS1285
GUID-A47DD096-2CF6-4EF3-8ED0-962799AD76BA-low.svgFigure 9-5 DC Measurement With ADS1285 (VIN = 0 V)
GUID-F62026C4-5B47-4D24-925B-3BCB64845903-low.svgFigure 9-6 DC Measurement With ADS1285 (VIN = 2.0796 V (Close to FSR) )