SBOS584F November   2011  – September 2026 OPA180 , OPA2180 , OPA4180

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information: OPA180
    5. 6.5 Thermal Information: OPA2180
    6. 6.6 Thermal Information: OPA4180
    7. 6.7 Electrical Characteristics: VS = ±2V to ±18V (VS = 4V to 36V)
    8. 6.8 Typical Characteristics: Table of Graphs
    9. 6.9 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Operating Characteristics
      2. 7.3.2 EMI Rejection
      3. 7.3.3 Phase-Reversal Protection
      4. 7.3.4 Capacitive Load and Stability
      5. 7.3.5 Electrical Overstress
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Bipolar ±10V Analog Output from a Unipolar Voltage Output DAC
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Component Selection
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Discrete INA + Attenuation
      3. 8.2.3 RTD Amplifier
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.4 Capacitive Load and Stability

The dynamic characteristics of the OPAx180 are optimized for a range of common operating conditions. The combination of low closed-loop gain and high capacitive loads decreases the phase margin of the amplifier and can lead to gain peaking or oscillations. As a result, heavier capacitive loads must be isolated from the output. The simplest way to achieve this isolation is to add a small resistor (for example, ROUT equal to 50Ω) in series with the output. Figure 7-3 and Figure 7-4 illustrate graphs of small-signal overshoot versus capacitive load for several values of ROUT. See the Feedback Plots Define Op Amp AC Performance, application report, available for download from the TI website, for details of analysis techniques and application circuits.

OPA180 OPA2180 OPA4180 Small-Signal Overshoot Versus Capacitive Load
RL = 10kΩ100mV output step
Figure 7-3 Small-Signal Overshoot Versus Capacitive Load
OPA180 OPA2180 OPA4180 Small-Signal Overshoot Versus Capacitive Load
RL = 10kΩ100mV output step
Figure 7-4 Small-Signal Overshoot Versus Capacitive Load