JAJS760E August   2000  – February 2024 LMC6081 , LMC6082 , LMC6084

PRODUCTION DATA  

  1.   1
  2. 1特長
  3. 2アプリケーション
  4. 3概要
  5. 4Pin Configuration and Functions
  6. 5Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information LMC6081
    5. 5.5 Thermal Information LMC6082
    6. 5.6 Thermal Information LMC6084
    7. 5.7 Electrical Characteristics
    8. 5.8 Typical Characteristics
  7. 6Application and Implementation
    1. 6.1 Application Information
      1. 6.1.1 Amplifier Topology
      2. 6.1.2 Compensating for Input Capacitance
      3. 6.1.3 Capacitive Load Tolerance
      4. 6.1.4 Latch-Up
    2. 6.2 Typical Applications
      1. 6.2.1 Typical Single-Supply Applications
      2. 6.2.2 Instrumentation Amplifier
    3. 6.3 Layout
      1. 6.3.1 Layout Guidelines
        1. 6.3.1.1 Printed Circuit Board Layout for High-Impedance Work
  8. 7Device and Documentation Support
    1. 7.1 ドキュメントの更新通知を受け取る方法
    2. 7.2 サポート・リソース
    3. 7.3 Trademarks
    4. 7.4 静電気放電に関する注意事項
    5. 7.5 用語集
  9. 8Revision History
  10. 9Mechanical, 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

6.2.1 Typical Single-Supply Applications

The extremely high input impedance, and low power consumption, make the LMC608x an excellent choice for applications that require battery-powered operation. Examples of these types of applications are hand-held pH probes, analytic medical instruments, magnetic field detectors, gas detectors, and silicon based pressure transducers.

Figure 6-4 shows an instrumentation amplifier that features high differential and common mode input resistance (> 1014Ω), 0.01% gain accuracy at AV = 1000, excellent CMRR with 1kΩ imbalance in bridge source resistance. Input current is less than 100fA and offset drift is less than 2.5μV/°C. R2 provides a simple means of adjusting gain over a wide range without degrading CMRR. R7 is an initial trim used to maximize CMRR without using super precision matched resistors. For good CMRR over temperature, use low drift resistors like the RES11A. An example of an instrumentation amplifier with the LMC608x is provided in the next section.

GUID-C97760E4-1B5F-46BC-8B3F-0C86DA7F91F7-low.png
If R1 = R5, R3 = R6, and R4 = R7; then
Equation 3. V O U T V I N   = R 2 + 2 R 1 R 2 × R 4 R 3
AV ≈ 100 for circuit shown (R2 = 9.822kΩ).
Figure 6-4 Instrumentation Amplifier
GUID-BE807D13-91DF-447A-B3A3-8DACE9D0FA1A-low.pngFigure 6-5 Low Leakage Sample and Hold
GUID-CA0A6D76-2161-4DC4-B03D-4DBCB6995580-low.pngFigure 6-6 1Hz Square-Wave Oscillator