SBOS259F September   2002  – June 2018 OPA2363 , OPA2364 , OPA363 , OPA364 , OPA4364

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Single-Supply Microphone Preamplifier
  4. 4 Revision History
  5. 5 Device Comparison Table
    1. 5.1 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions: OPA363
    2.     Pin Functions: OPA2363
    3.     Pin Functions: OPA364
    4.     Pin Functions: OPA2364
    5.     Pin Functions: OPA4364
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information: OPA363
    5. 7.5  Thermal Information: OPA364
    6. 7.6  Thermal Information: OPA2363
    7. 7.7  Thermal Information: OPA2364
    8. 7.8  Thermal Information: OPA4364
    9. 7.9  Electrical Characteristics
    10. 7.10 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Rail-to-Rail Input
      2. 8.3.2 Operating Voltage
      3. 8.3.3 Capacitive Load
      4. 8.3.4 Input and ESD Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Enable Function
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Achieving Output Swing to the Op Amp Negative Rail
      2. 9.1.2 Directly Driving the ADS8324 and the MSP430
      3. 9.1.3 Audio Applications
      4. 9.1.4 Active Filtering
    2. 9.2 Typical Application
      1. 9.2.1 Single-Supply Electret Microphone Preamplifier
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
        1. 12.1.1.1 TINA-TI™ (Free Software Download)
        2. 12.1.1.2 DIP Adapter EVM
        3. 12.1.1.3 Universal Op Amp EVM
        4. 12.1.1.4 TI Precision Designs
        5. 12.1.1.5 WEBENCH Filter Designer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Related Links
    4. 12.4 Receiving Notification of Documentation Updates
    5. 12.5 Community Resource
    6. 12.6 Trademarks
    7. 12.7 Electrostatic Discharge Caution
    8. 12.8 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.1.1 Achieving Output Swing to the Op Amp Negative Rail

Some applications require an accurate output voltage swing from 0 V to a positive full-scale voltage. A good single-supply op amp may be able to swing within a few millivolts of single-supply ground, but as the output is driven toward 0 V, the output stage of the amplifier prevents the output from reaching the negative supply rail of the amplifier.

The output of the OPAx363 or OPAx364 can be made to swing to ground, or slightly below, on a single-supply power source. To do so requires use of another resistor and an additional, more negative power supply than the op amp negative supply. A pulldown resistor may be connected between the output and the additional negative supply to pull the output down below the value that the output would otherwise achieve, as shown in Figure 24.

OPA363 OPA2363 OPA364 OPA2364 OPA4364 ai_opa363_364_swing_bos259.gifFigure 24. OPA363 and OPA364 Swing to Ground

This technique does not work with all op amps. The output stage of the OPAx363 and OPA3x64 allows the output voltage to be pulled below that of most op amps, if approximately 500 µA is maintained through the output stage. To calculate the appropriate value load resistor and negative supply, RL = –V / 500 µA. The OPAx363 and OPAx364 are characterized to perform well under the described conditions, maintaining excellent accuracy down to 0 V and as low as –10 mV. Limiting and nonlinearity occur below –10 mV, with linearity returning as the output is again driven above –10 mV.