SBOS410O June   2007  – October 2025 REF50 , REF50E

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 REF50xxI and REF50xxAI
    6. 6.6 Electrical Characteristics REF50xxEI
    7. 6.7 Typical Characteristics: REF50xxI, REF50xxAI
    8. 6.8 Typical Characteristics: REF50xxEI
  8. 7 Parameter Measurement Information
    1. 7.1 Solder Heat Shift
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Temperature Monitoring
      2. 8.3.2 Temperature Drift
      3. 8.3.3 Thermal Hysteresis
      4. 8.3.4 Noise Performance
      5. 8.3.5 Long-Term Stability
      6. 8.3.6 Output Adjustment Using the TRIM/NR Pin
    4. 8.4 Device Functional Modes
      1. 8.4.1 Basic Connections
      2. 8.4.2 Supply Voltage
      3. 8.4.3 Negative Reference Voltage
  10. 9 Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 16-bit, 250KSPS Data Acquisition System
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curve
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
        1. 9.4.1.1 REF50xxI, REF50xxAI Layout Guidelines
        2. 9.4.1.2 REF50xxEI Layout Guidelines
      2. 9.4.2 Layout Example
      3. 9.4.3 Power Dissipation
  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 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 Detailed Design Procedure

The OPA365 is used to drive the 16-bit analog-to-digital converter (ADS8326). The RC filter at the output of the OPA365 is used to reduce the charge kick-back created by the opening and closing of the sampling switch inside the ADC. Design the RC filter such that the voltage at the sampling capacitor settles to 16-bit accuracy within the acquisition time of the ADC. Verify that the bandwidth of the driving amplifier is at least be four times the bandwidth of the RC filter.

The REF5040 is used to drive the REF pin of the ADS8326. Proper selection of voltage reference output capacitor is very important for this design. Very low equivalent series resistance (ESR) creates gain-peaking, which degrades SNR of the total system. If the ESR of the capacitor is not enough, then an additional resistor must be added in series with the output capacitor. A capacitance of 1μF can connect to the NR pin to reduce band-gap noise of the REF50xx.

Table 9-1 shows SNR measurements using different RC filters at the output of the OPA365, different values of output capacitor for the REF50xx and different values of capacitors at the TRIM/NR pin.

Table 9-1 Data Acquisition Measurement Results for Different Conditions
TEST CONDITION 1TEST CONDITION 2
OPA365 RC filter124Ω, 1nF124Ω, 1nF
REF5040 output capacitor10μF10μF + 47μF
TRIM/NR pin capacitor0μF1μF
SNR86.7dB92.8dB