SBOS492G June   2009  – August 2026 OPA2354A-Q1 , OPA354A-Q1 , OPA4354-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Operating Voltage
      2. 6.3.2 Rail-to-Rail Input
      3. 6.3.3 Rail-to-Rail Output
      4. 6.3.4 Output Drive
      5. 6.3.5 Video
      6. 6.3.6 Driving Analog-to-Digital Converters
      7. 6.3.7 Capacitive Load and Stability
      8. 6.3.8 Wideband Transimpedance Amplifier
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Transimpedance Amplifier
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
          1. 7.2.1.2.1 Optimizing The Transimpedance Circuit
        3. 7.2.1.3 Application Curve
      2. 7.2.2 High-Impedance Sensor Interface
      3. 7.2.3 Driving ADCs
      4. 7.2.4 Active Filter
    3. 7.3 Power Supply Recommendations
      1. 7.3.1 Power Dissipation
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.2.3 Driving ADCs

The OPAx354-Q1 op amps are designed for driving sampling analog-to-digital converters (ADCs) with sampling speeds up to 1MSPS. The zero-crossover distortion input stage topology allows the OPAx354-Q1 family of devices to drive ADCs without degradation of differential linearity and THD.

The OPAx354-Q1 family of devices can be used to buffer the ADC switched input capacitance and resulting charge injection while providing signal gain. Figure 7-5 shows the OPAx354-Q1 family of devices configured to drive the ADS8326.

OPA354A-Q1 OPA2354A-Q1 OPA4354-Q1 Driving the ADS8326
A. Suggested value; may require adjustment based on specific application.
B. Single-supply applications lose a small number of ADC codes near ground as a result of op amp output swing limitation. If a negative power supply is available, this simple circuit creates a –0.3V supply to allow output swing to true ground potential.
Figure 7-5 Driving the ADS8326