SBOS135D January   1984  – October 2026 OPA27 , OPA37

PRODUCTION DATA  

  1.   1
  2. 1Features
  3. 2Applications
  4. 3Description
  5. 4Pin Configuration and Functions
  6. 5Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Electrical Characteristics OPA27
    3. 5.3 Electrical Characteristics: OPA37
    4. 5.4 Typical Characteristics
  7. 6Application and Implementation
    1. 6.1 Application Information
      1. 6.1.1 Offset Voltage Adjustment
      2. 6.1.2 Noise: Bipolar Versus FET
      3. 6.1.3 Compensation
      4. 6.1.4 Legacy vs. New Die
    2. 6.2 Typical Applications
  8. 7Device and Documentation Support
    1. 7.1 Receiving Notification of Documentation Updates
    2. 7.2 Support Resources
    3. 7.3 Trademarks
    4. 7.4 Electrostatic Discharge Caution
    5. 7.5 Glossary
  9. 8Revision History
  10. 9Mechanical, Packaging, and Orderable Information

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6.1.2 Noise: Bipolar Versus FET

Low-noise circuit design requires careful analysis of all noise sources. External noise sources can dominate in many cases, so consider the effect of source resistance on overall operational amplifier noise performance. At low source impedances, the lower voltage noise of a bipolar operational amplifier is superior, but at higher impedances, the high current noise of a bipolar amplifier becomes a serious liability. Above about 15 kΩ, the OPA111 low-noise FET operational amplifier is recommended for lower total noise than the OPA27, as shown in Figure 6-3.

OPA27 OPA37 Voltage Noise Spectral Density Versus Source Resistance
A. OPA27 OPA37
Figure 6-3 Voltage Noise Spectral Density Versus Source Resistance