SBOS673 September 2017 OPA837


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics: VS = 5 V
    6. 6.6Electrical Characteristics: VS = 3 V
    7. 6.7Typical Characteristics: VS = 5.0 V
    8. 6.8Typical Characteristics: VS = 3.0 V
    9. 6.9Typical Characteristics: ±2.5-V to ±1.5-V Split Supply
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagrams
    3. 7.3Feature Description
      1. 7.3.1OPA837 Comparison
      2. 7.3.2Input Common-Mode Voltage Range
      3. 7.3.3Output Voltage Range
      4. 7.3.4Power-Down Operation
      5. 7.3.5Low-Power Applications and the Effects of Resistor Values on Bandwidth
      6. 7.3.6Driving Capacitive Loads
    4. 7.4Device Functional Modes
      1. 7.4.1Split-Supply Operation (±1.35 V to ±2.7 V)
      2. 7.4.2Single-Supply Operation (2.7 V to 5.4 V)
  8. Application and Implementation
    1. 8.1Application Information
      1. 8.1.1 Noninverting Amplifier
      2. 8.1.2 Inverting Amplifier
      3. 8.1.3 Output DC Error Calculations
      4. 8.1.4 Output Noise Calculations
      5. 8.1.5 Instrumentation Amplifier
      6. 8.1.6 Attenuators
      7. 8.1.7 Differential to Single-Ended Amplifier
      8. 8.1.8 Differential-to-Differential Amplifier
      9. 8.1.9 Pulse Application With Single-Supply Circuit
      10. 8.1.10ADC Driver Performance
    2. 8.2Typical Applications
      1. 8.2.1Active Filters
        1. Requirements
        2. Design Procedure
        3. Curves
      2. 8.2.2Implementing a 2:1 Active Multiplexer
        1. Requirements
        2. Design Procedure
      3. 8.2.31-Bit PGA Operation
        1. Requirements
        2. Design Procedure
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Documentation Support
      1. 11.1.1Related Documentation
    2. 11.2Receiving Notification of Documentation Updates
    3. 11.3Community Resources
    4. 11.4Trademarks
    5. 11.5Electrostatic Discharge Caution
    6. 11.6Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Power Supply Recommendations

The OPA837 is intended to work in a nominal supply range of 3.0 V to 5 V. Supply-voltage tolerances are supported with the specified operating range of 2.7 V (–10% on a 3-V supply) and 5.4 V (+8% on a 5-V supply). Good power-supply bypassing is required. Minimize the distance (< 0.1 inch) from the power-supply pins to high-frequency, 0.1-µF decoupling capacitors. A larger capacitor (2.2 µF is typical) is used along with a high-frequency, 0.1-µF supply-decoupling capacitor at the device supply pins. For single-supply operation, only the positive supply has these capacitors. When a split supply is used, use these capacitors for each supply to ground. If necessary, place the larger capacitors further from the device and share these capacitors among several devices in the same area of the printed circuit board (PCB). Avoid narrow power and ground traces to minimize inductance between the pins and the decoupling capacitors. An optional supply decoupling capacitor across the two power supplies (for bipolar operation) reduces second harmonic distortion.

The OPA837 has a positive supply current temperature coefficient; see Figure 57. This coefficient helps improve the input offset voltage drift. Supply current requirements in the system design must account for this effect using the maximum intended ambient and Figure 57 to size the supply required. The very low power dissipation for the OPA837 typically does not require any special thermal design considerations. For the extreme case of 125°C operating ambient, use the approximate maximum 200°C/W for the two packages, and a maximum internal power of 5.4-V supply × 0.8-mA 125°C supply current from Figure 57 gives a maximum internal power of 4.3 mW. This power only gives a 0.86°C rise from ambient to junction temperature, which is well below the maximum 150°C junction temperature. Load power adds to this value, but also increases the junction temperature only slightly over ambient temperature.