JAJS910H January   2000  – December 2024 LMC6035 , LMC6036

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: LMC6035
    5. 5.5 Thermal Information: LMC6036
    6. 5.6 Electrical Characteristics
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Capacitive Load Tolerance
    2. 7.2 Typical Applications
      1. 7.2.1 Differential Driver
      2. 7.2.2 Low-Pass Active Filter
        1. 7.2.2.1 Low-Pass Frequency Scaling Procedure
      3. 7.2.3 High-Pass Active Filter
        1. 7.2.3.1 High-Pass Frequency Scaling Procedure
      4. 7.2.4 Dual-Amplifier Bandpass Filter
        1. 7.2.4.1 DABP Component Selection Procedure
    3. 7.3 Layout
      1. 7.3.1 Layout Guidelines
        1. 7.3.1.1 Printed Circuit Board (PCB) Layout for High-Impedance Work
        2. 7.3.1.2 DSBGA Considerations
      2. 7.3.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 ドキュメントの更新通知を受け取る方法
    2. 8.2 サポート・リソース
    3.     Trademarks
    4. 8.3 静電気放電に関する注意事項
    5. 8.4 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

7.2.2 Low-Pass Active Filter

A common application for low voltage systems is active filters, in cordless and cellular phones for example. The ultra low input bias currents (IB) of the LMC603x makes these op amps an excellent for low power active filter applications, because the low input bias current allows the use of higher resistor values and lower capacitor values. This reduces power consumption and space.

Figure 7-7 shows a low pass, active filter with a Butterworth (maximally flat) frequency response. The topology is a Sallen and Key filter with unity gain. Note the normalized component values in parenthesis which are obtainable from standard filter design handbooks. These values provide a 1Hz cutoff frequency, but can be easily scaled for a desired cutoff frequency (fc). The bold component values of Figure 7-7 provide a cutoff frequency of 3kHz. An example of the scaling procedure follows Figure 7-7.

LMC6035 LMC6036 2-Pole, 3kHz, Active, Sallen and Key, Low-Pass Filter With Butterworth Response Figure 7-7 2-Pole, 3kHz, Active, Sallen and Key, Low-Pass Filter With Butterworth Response