SBOS748 September   2016 REF6225 , REF6230 , REF6233 , REF6241 , REF6245 , REF6250

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application
      2.      Reference Droop comparison (1 LSB = 19.07 µV, With ADS8881 at 1 MSPS)
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Parameter Measurement Information
    1. 8.1 Solder Heat Shift
    2. 8.2 Thermal Hysteresis
    3. 8.3 Reference Droop Measurements
    4. 8.4 1/f Noise Performance
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Integrated ADC Drive Buffer
      2. 9.3.2 Temperature Drift
      3. 9.3.3 Load Current
      4. 9.3.4 Stability
    4. 9.4 Device Functional Modes
  10. 10Applications and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Results
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Related Links
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Community Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

9.3.4 Stability

The REF62xx family of voltage references are stable with output capacitor values ranging from 10 µF to 47 µF. At a low output-capacitor value of 10 µF, an effective series resistance (ESR) of 20 mΩ to 100 mΩ is required for stability; whereas, at a higher value of 47 µF, an ESR of 5 mΩ to 100 mΩ is required. The shaded region in Figure 52 shows the stable region of operation for the REF62xx devices.

REF6225 REF6230 REF6233 REF6241 REF6245 REF6250 ESR_Outcap_BOS708.gifFigure 52. Stable Output Capacitor Range

A capacitor of value 1 µF is required at the FILT pin for stability and noise performance. A low ESR (5 mΩ to 20 mΩ) is easily achieved by increasing the PCB trace length, thus eliminating the need for a discrete resistor. Higher values of ESR (greater than 20 mΩ, but lesser than 100 mΩ) can be intentionally added to increase the output bandwidth of the REF62xx. This higher ESR improves the transient performance of the REF62xx, but worsens noise performance because of increased bandwidth.