JAJSLJ2J January   2011  – March 2021 OPA2836 , OPA836

PRODUCTION DATA  

  1. 特長
  2. アプリケーション
  3. 概要
  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: OPA836
    5. 7.5 Thermal Information: OPA2836
    6. 7.6 Electrical Characteristics: VS = 2.7 V
    7. 7.7 Electrical Characteristics: VS = 5 V
    8. 7.8 Typical Characteristics: VS = 2.7 V
    9. 7.9 Typical Characteristics: VS = 5 V
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 Input Common-Mode Voltage Range
      2. 8.3.2 Output Voltage Range
      3. 8.3.3 Power-Down Operation
      4. 8.3.4 Low-Power Applications and the Effects of Resistor Values on Bandwidth
      5. 8.3.5 Driving Capacitive Loads
    4. 8.4 Device Functional Modes
      1. 8.4.1 Split-Supply Operation (±1.25 V to ±2.75 V)
      2. 8.4.2 Single-Supply Operation (2.5 V to 5.5 V)
  9. Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1  Noninverting Amplifier
      2. 9.1.2  Inverting Amplifier
      3. 9.1.3  Instrumentation Amplifier
      4. 9.1.4  Attenuators
      5. 9.1.5  Single-Ended-to-Differential Amplifier
      6. 9.1.6  Differential-to-Signal-Ended Amplifier
      7. 9.1.7  Differential-to-Differential Amplifier
      8. 9.1.8  Gain Setting With OPA836 RUN Integrated Resistors
      9. 9.1.9  Pulse Application With Single-Supply
      10. 9.1.10 ADC Driver Performance
    2. 9.2 Typical Applications
      1. 9.2.1 Audio Frequency Performance
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Active Filters
        1. 9.2.2.1 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
      2. 12.1.2 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 サポート・リソース
    4. 12.4 静電気放電に関する注意事項
    5. 12.5 用語集
    6. 12.6 Trademarks
  13. 13Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ(パッケージ|ピン)
サーマルパッド・メカニカル・データ
発注情報

Single-Supply Operation (2.5 V to 5.5 V)

Often, newer systems use a single power supply to improve efficiency and reduce the cost of the power supply. The OPA836 and OPA2836 devices are designed for use with a single supply with no change in performance compared to a split supply, as long as the input and output are biased within the linear operation of the device.

To change the circuit from split supply to single supply, level shift of all voltages by half the difference between the power supply rails. For example, changing from ±2.5-V split supply to 5-V single supply is shown in Figure 8-7.

GUID-84AF0B54-97F4-414E-A363-502A1BD3B728-low.gifFigure 8-7 Single-Supply Concept

A practical circuit will have an amplifier or other circuit providing the bias voltage for the input, and the output of this amplifier stage provides the bias for the next stage.

Figure 8-8 shows a typical noninverting amplifiercircuit. With 5-V single-supply, a mid-supply reference generator is needed to bias the negative side through RG. To cancel the voltage offset that would otherwise be caused by the input bias currents, R1 is selected to be equal to RF in parallel with RG. For example, if gain of 2 is required and RF = 1 kΩ, select RG = 1 kΩ to set the gain and R1 = 499 Ω for bias-current cancellation. The value for C depends on the reference; TI recommends a value of at least 0.1 µF to limit noise.

GUID-154895DA-E4CF-4943-8130-4FA69E6DB5A0-low.gifFigure 8-8 Noninverting Single Supply With Reference

Figure 8-9 shows a similar noninverting single-supply scenario with the reference generator replaced by the Thevenin equivalent using resistors and the positive supply. RG’ and RG” form a resistor divider from the 5-V supply and are used to bias the negative side with their parallel sum equal to the equivalent RG to set the gain. To cancel the voltage offset that would otherwise be caused by the input bias currents, R1 is selected to be equal to RF in parallel with RG’ in parallel with RG” (R1= RF || RG’ || RG”). For example, if gain of 2 is required and RF = 1 kΩ, selecting RG’ = RG” = 2 kΩ gives equivalent parallel sum of 1 kΩ, sets the gain to 2, and references the input to mid supply (2.5 V). R1 is then set to 499 Ω for bias-current cancellation. The resistor divider costs less than the 2.5 V reference in Figure 8-8 but may increase the current from the 5-V supply.

GUID-B249553D-5ADF-4DD7-9DDD-5D30757786F2-low.gifFigure 8-9 Noninverting Single Supply With Resistors

Figure 8-10 shows a typical inverting amplifier situation. With 5-V single supply, a mid-supply reference generator is needed to bias the positive side through R1. To cancel the voltage offset that would otherwise be caused by the input bias currents, R1 is selected to be equal to RF in parallel with RG. For example if gain of –2 is required and RF = 1 kΩ, select RG = 499 Ω to set the gain and R1 = 332 Ω for bias-current cancellation. The value for C is dependent on the reference, but TI recommends a value of at least 0.1 µF to limit noise into the operational amplifier.

GUID-9A78AE8E-B54E-4A2B-8804-95334D9FA27B-low.gifFigure 8-10 Inverting Single Supply With Reference

Figure 8-11 shows a similar inverting single-supply scenario with the reference generator replaced by the Thevenin equivalent using resistors and the positive supply. R1 and R2 form a resistor divider from the 5-V supply and are used to bias the positive side. To cancel the voltage offset that would otherwise be caused by the input bias currents, set the parallel sum of R1 and R2 equal to the parallel sum of RF and RG. C must be added to limit coupling of noise into the positive input. For example if gain of –2 is required and RF = 1 kΩ, select RG = 499 Ω to set the gain. R1 = R2 = 665 Ω for mid-supply voltage bias and for operational amplifier input bias-current cancellation. A good value for C is 0.1 µF. The resistor divider costs less than the 2.5-V reference in Figure 8-10 but may increase the current from the 5-V supply.

GUID-F013C2CC-415B-40AC-9596-1F8A97E78C87-low.gifFigure 8-11 Inverting Single Supply With Resistors