JAJS809H September   1999  – January 2025 LMC7101Q-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  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 for VS = 2.7V or ±1.35V
    6. 5.6  Electrical Characteristics for VS = 3V or ±1.5V
    7. 5.7  Electrical Characteristics for VS = 5V or ±2.5V
    8. 5.8  Electrical Characteristics for VS = 15V or ±7.5V
    9. 5.9  Typical Characteristics for VS = 2.7V
    10. 5.10 Typical Characteristics for VS = 3V
    11. 5.11 Typical Characteristics for VS = 5V
    12. 5.12 Typical Characteristics for VS = 15V
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Benefits of the LMC7101 Tiny Amplifier
        1. 6.3.1.1 Size
        2. 6.3.1.2 Height
        3. 6.3.1.3 Signal Integrity
        4. 6.3.1.4 Simplified Board Layout
        5. 6.3.1.5 Low THD
        6. 6.3.1.6 Low Supply Current
        7. 6.3.1.7 Wide Voltage Range
    4. 6.4 Device Functional Modes
      1. 6.4.1 Input Common-Mode Voltage Range
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Rail-to-Rail Output
      2. 7.1.2 Capacitive Load Tolerance
      3. 7.1.3 Compensating for Input Capacitance When Using Large Value Feedback Resistors
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Application Curve
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 ドキュメントの更新通知を受け取る方法
    3. 8.3 サポート・リソース
    4. 8.4 Trademarks
    5. 8.5 静電気放電に関する注意事項
    6. 8.6 用語集
  10. 9 Revision History
  11. 10Mechanical, 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

7.1.3 Compensating for Input Capacitance When Using Large Value Feedback Resistors

When using very large value feedback resistors, (usually >500 kΩ) the large feed back resistance can react with the input capacitance due to transducers, photo diodes, and circuit board parasitics to reduce phase margins.

The effect of input capacitance can be compensated for by adding a feedback capacitor. The feedback capacitor (as in Figure 7-2), Cf is first estimated by Equation 1 and Equation 2, which typically provides significant overcompensation.

Equation 1. 1 2 π R 1 C I N ≥ 1 2 π R 2 C f
Equation 2. 2 π R 1 C I N ≤ 2 π R 2 C f

Printed circuit board stray capacitance can be larger or smaller than that of a breadboard, so the actual optimum value for CF can be different. The values of CF must be checked on the actual circuit.

LMC7101Q-Q1 Canceling the Effect of Input Capacitance Figure 7-2 Canceling the Effect of Input Capacitance