SBOS867D August   2017  – September 2024 OPA838

PRODMIX  

  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
    5. 6.5 Electrical Characteristics VS = 5 V
    6. 6.6 Electrical Characteristics VS = 3 V
    7. 6.7 Typical Characteristics: VS = 5 V
    8. 6.8 Typical Characteristics: VS = 3 V
    9. 6.9 Typical Characteristics: Over Supply Range
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input Common-Mode Voltage Range
      2. 7.3.2 Output Voltage Range
      3. 7.3.3 Power-Down Operation
      4. 7.3.4 Trade-Offs in Selecting The Feedback Resistor Value
      5. 7.3.5 Driving Capacitive Loads
    4. 7.4 Device Functional Modes
      1. 7.4.1 Split-Supply Operation (±1.35 V to ±2.7 V)
      2. 7.4.2 Single-Supply Operation (2.7 V to 5.4 V)
      3. 7.4.3 Power Shutdown Operation
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Noninverting Amplifier
      2. 8.1.2 Inverting Amplifier
      3. 8.1.3 Output DC Error Calculations
      4. 8.1.4 Output Noise Calculations
    2. 8.2 Typical Applications
      1. 8.2.1 High-Gain Differential I/O Designs
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Transimpedance Amplifier
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
    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 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 TINA-TI™ Simulation Software (Free Download)
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DBV|6
  • DCK|5
  • DCK|6
  • DXB|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.3 Power-Down Operation

The OPA838 includes a power-down feature. Under logic control, the amplifier can switch from normal operation to a standby current of less than 1 µA. When the PD pin is connected high (greater than or equal to 1.5 V over the negative supply), the amplifier is active. Connecting the PD pin low (less than or equal to 0.55 V over the negative supply) disables the amplifier. To protect the input stage of the amplifier, the device uses internal, back-to-back diodes (two in series each way) between the inverting and noninverting input pins. If the differential voltage in shutdown exceeds 1.2 V, those diodes turn on.

Actively drive the PD pin high or low; do not float this pin. If the power-down mode is not used, tie the PD pin to the positive supply rail.

When the op amp is powered from a single-supply and ground, with PD driven from logic devices with similar VDD voltages to the op amp, no special considerations are required. When the op amp is powered from a split-supply with VS– less than ground, an open-collector type of interface with a pullup resistor is more appropriate. Pullup resistor values must be less than 100 kΩ. Recovery from power down is illustrated in Figure 6-53 and Figure 6-54 for several gains. In single-supply mode, with the gain resistor at ground, the output approaches the positive supply on initial power-up until the internal nodes charge, and then recover to the target output voltage; see Figure 6-51 and Figure 6-52.