SBOS982G June   2020  – July 2022 OPA2863 , OPA4863 , OPA863

PRODMIX  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information: OPA863
    5. 7.5  Thermal Information: OPA2863
    6. 7.6  Thermal Information: OPA4863
    7. 7.7  Electrical Characteristics: VS = 10 V
    8. 7.8  Electrical Characteristics: VS = 3 V
    9. 7.9  Typical Characteristics: VS = 10 V
    10. 7.10 Typical Characteristics: VS = 3 V
    11. 7.11 Typical Characteristics: VS = 3 V to 10 V
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Input Stage
      2. 8.3.2 Output Stage
        1. 8.3.2.1 Overload Power Limit
      3. 8.3.3 ESD Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Down Mode
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Low-Side Current Sensing
      1. 9.2.1 Design Requirements
    3. 9.3 Front-End Gain and Filtering
    4. 9.4 Low-Power SAR ADC Driver and Reference Buffer
    5. 9.5 Variable Reference Generator Using MDAC
    6. 9.6 Clamp-On Ultrasonic Flow Meter
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Thermal Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

Power-Down Mode

The OPAx863 includes a power-down mode for low-power standby operation with a quiescent current of only 1.5 μA (maximum) with a 3-V supply and high output impedance. Many low-power systems are active for only a small time interval when the parameters of interest are measured and remain in low-power standby mode for a majority of the time and an overall small average power consumption. The OPAx863 enables such a low-power operation with quick turn-on within less than 6.5 μs. Refer to the Electrical Characteristics tables for power-down pin control thresholds.

The PD pin always needs to be driven to avoid false triggering and oscillations. If it is not necessary to use the power-down mode, then the PD pin should be connected to VS+. For applications which need the power-down mode, an external pull-up resistor from the PD pin to VS+ (driven with an open-collector power-down control logic) may be used.



Figure 8-2 Power Down Control

Figure 8-2 shows the choice of value of the pull-up resistor RPU, which impacts the current consumption in power-down mode. Using a large RPU reduces the power consumption, but increases the noise at the PD pin which could cause the amplifier to power-down. A 1 nF capacitor may be used in parallel with RPU to avoid coupling of external noise and false triggering. For the case of PD pin driven to VS-, the current IPU through RPU is given as,

Equation 1. GUID-20210426-CA0I-81PD-8CZF-LWF1JHKM4M79-low.gif