JAJU814C April   2021  – September 2022

 

  1.   概要
  2.   リソース
  3.   特長
  4.   アプリケーション
  5.   5
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 OPA365-Q1 (50 MHz)
      2. 2.3.2 OPA607-Q1 (50 MHz)
      3. 2.3.3 OPA836 (same as OPA2836-Q1) (205 MHz)
      4. 2.3.4 OPA863 (50 MHz)
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
      1.      19
    3. 3.3 Test Results
  9. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Documentation Support
    3. 4.3 サポート・リソース
    4. 4.4 Trademarks
  10. 5About the Author
  11. 6Revision History

Test Setup

  1. Adjust or remove the feedback and gain components to provide reduced or additional gain and filtering. When using a feedback capacitor, be aware that an integrator amplifier circuit can be created unintentionally. The following measurements use no external capacitors (See the OPA607 low gain stabilization, documented in the Decompensated Amplifier Stabilization Circuit design to use the OPA607 for < 5 V/V gain).
  2. Figure 3-1 shows the red test point supplies VS+ and the yellow test point supplies VS- to all four amplifiers. The black test point is connected to chassis ground, and is shorted to the yellow test point VS- by a ferrite bead L2. L2 can be opened to enable a bipolar supply for use with ground-referenced test equipment.
  3. The total supply should be no higher than 5 V to avoid damaging the amplifiers. To avoid damage to a typical target ADC, this test uses 3.3 VS. The default amplifier output reference is mid-supply; for zero current, the amplifier has an output of 1.65 V.
  4. Set the oscilloscope input to high-impedance mode and attach the BNC output (labeled J2) to the oscilloscope. Alternatively, the test point Vo can be used with a hook-probe lead.
  5. Attach the function generator to the J3 BNC input.
  6. Set both the input slide switch and the output slide switch to the same incremental position to enable the corresponding amplifier. When both switches are in position 1, the OPA365-Q1 is enabled.
  7. Power-on the system and use the oscilloscope to compare the rise times, noise, THD, and overdrive recovery time of the four different amplifier devices and or circuit configurations.