SBOSA42 June   2024 OPA596

ADVANCE INFORMATION  

  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
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Mux-Friendly Inputs
      2. 6.3.2 Thermal Protection
      3. 6.3.3 Slew Boost
      4. 6.3.4 Overload Recovery
    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 Bridge-Connected Piezoelectric Driver
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
      2. 7.2.2 DAC Output Gain and Buffer
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
      3. 7.2.3 Single-Supply Piezoelectric Driver
      4. 7.2.4 High-Side Current Sense
      5. 7.2.5 High-Voltage Instrumentation Amplifier
      6. 7.2.6 Composite Amplifier
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 Thermal Considerations
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Tape and Reel Information

6.3.3 Slew Boost

Slew rate is the maximum rate of change of output voltage change with respect to time and is typically specified in units of volts per microsecond, V/µs. The OPAx596 can enter a slew condition when a large, rapid moving signal is applied at the input. While slewing, the op amp enters an open loop condition and significant slew induced distortion can be seen on the output signal.

Equation 1 shows that the slew rate of an op amp is typically determined by the saturation current of the input stage, ISAT, and the compensation capacitor, CC.

Equation 1. S R = I S A T C C

The slew rate scales with the quiescent current, IQ, of the op amp. There are several ways that designers have overcome slew rate limitation. For example, decompensation improves slew rate at the expense of stability by lowering CC. More commonly, modern op amps are equipped with slew boost technology that increases ISAT to overcome the inherent slew rate limitations. Slew boost circuits can vary in implementation, but designers can typically expect about a 4 × improvement over comparable unboosted op amps.

The OPAx596 uses a proprietary design to achieve an unprecedented slew rate to IQ ratio. The novel slew boost technology in OPAx596 provides a nearly 100 × slew rate improvement over comparable unboosted op amps.