SBOS079B March   1999  – June 2015 OPA2277 , OPA277 , OPA4277

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information for OPA277
    5. 6.5 Thermal Information for OPA2277
    6. 6.6 Thermal Information for OPA4277
    7. 6.7 Electrical Characteristics for OPAx277P, OPAx277U, and OPAx277xA
    8. 6.8 Electrical Characteristics for OPAx277AIDRM
    9. 6.9 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Operating Voltage
      2. 7.3.2 Offset Voltage Adjustment
      3. 7.3.3 Input Protection
      4. 7.3.4 Input Bias Current Cancellation
      5. 7.3.5 EMI Rejection Ratio (EMIRR)
        1. 7.3.5.1 EMIRR IN+ Test Configuration
    4. 7.4 Device Functional Modes
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Second-Order Lowpass Filter
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Load Cell Amplifier
      3. 8.2.3 Thermocouple Low-Offset, Low-Drift Loop Measurement With Diode Cold Junction Compensation
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 DFN Package
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 WEBENCH Filter Designer Tool
        2. 11.1.1.2 TINA-TI (Free Software Download)
        3. 11.1.1.3 TI Precision Designs
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
      2. 11.2.2 Related Links
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ(パッケージ|ピン)
  • D|8
  • P|8
  • DRM|8
サーマルパッド・メカニカル・データ
発注情報

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

8.1 Application Information

The OPAx277 family offers outstanding dc precision and ac performance. These devices operate up to 36-V supply rails and offer ultralow offset voltage and offset voltage drift, as well as 1-MHz bandwidth and high capacitive load drive. These features make the OPAx277 a robust, high-performance operational amplifier for high-voltage industrial applications.

8.2 Typical Applications

8.2.1 Second-Order Lowpass Filter

OPA277 OPA2277 OPA4277 Low_Pass_Filter_SBOS079.gifFigure 29. Second-Order Lowpass Filter

8.2.1.1 Design Requirements

  • Gain = 1 V/V

  • Lowpass cutoff frequency = 50 kHz
  • –40 db/dec filter response

  • Maintain less than 3-dB gain peaking in the gain versus frequency response

8.2.1.2 Detailed Design Procedure

WEBENCH® Filter Designer is a simple, powerful, and easy-to-use active filter design program. The WEBENCH Filter Designer lets you create optimized filter designs using a selection of TI operational amplifiers and passive components from TI's vendor partners.

Available as a web based tool from the WEBENCH® Design Center, WEBENCH® Filter Designer allows you to design, optimize, and simulate complete multistage active filter solutions within minutes.

8.2.1.3 Application Curve

OPA277 OPA2277 OPA4277 D003_sbos079.gifFigure 30. OPA277 Second-Order 50-kHz, Lowpass Filter

8.2.2 Load Cell Amplifier

OPA277 OPA2277 OPA4277 load_cell_amp.gifFigure 31. Load Cell Amplifier

8.2.3 Thermocouple Low-Offset, Low-Drift Loop Measurement With Diode Cold Junction Compensation

OPA277 OPA2277 OPA4277 thermocouple_low_offset_low_drift_loop.gifFigure 32. Thermocouple Low-Offset, Low-Drift Loop Measurement With Diode Cold Junction Compensation