JAJSFO4B August   2017  – December 2018 OPA2810

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
    1.     マルチチャネル・センサ・インターフェイス
  3. 3 概要
    1.     高調波歪みと周波数との関係
  4. 4 改訂履歴
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics: 10 V
    6. 6.6  Electrical Characteristics: 24 V
    7. 6.7  Electrical Characteristics: 5 V
    8. 6.8  Typical Characteristics: VS = 10 V
    9. 6.9  Typical Characteristics: VS = 24 V
    10. 6.10 Typical Characteristics: VS = 5 V
    11. 6.11 Typical Characteristics: ±2.375 V to ±12 V Split Supply
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
      1. 7.2.1 ESD Protection
    3. 7.3 Feature Description
      1. 7.3.1 OPA2810 Comparison
    4. 7.4 Device Functional Modes
      1. 7.4.1 Split-Supply Operation (±2.375 V to ±13.5 V)
      2. 7.4.2 Single-Supply Operation (4.75 V to 27 V)
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Selection of Feedback Resistors
      2. 8.1.2 Noise Analysis and the Effect of Resistor Elements on Total Noise
    2. 8.2 Typical Applications
      1. 8.2.1 Transimpedance Amplifier
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
      2. 8.2.2 Multichannel Sensor Interface
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Thermal Considerations
    2. 10.2 Layout Example
  11. 11デバイスおよびドキュメントのサポート
    1. 11.1 ドキュメントのサポート
      1. 11.1.1 関連資料
    2. 11.2 ドキュメントの更新通知を受け取る方法
    3. 11.3 コミュニティ・リソース
    4. 11.4 商標
    5. 11.5 静電気放電に関する注意事項
    6. 11.6 Glossary
  12. 12メカニカル、パッケージ、および注文情報

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

8.2.2 Multichannel Sensor Interface

High-Z input amplifiers are particularly useful when interfaced with sensors that have relatively high output impedance. Such multichannel systems usually interface these sensors with the signal chain through a multiplexer. Figure 77 shows one such implementation using an amplifier for interface with each sensor, and driving into an ADC through a multiplexer. An alternate circuit, shown in Figure 78, may use a single higher GBWP and fast-settling amplifier at the output of the multiplexer. This gives rise to large signal transients when switching between channels, where the settling performance of the amplifier and maximum allowed differential input voltage limits signal chain performance and amplifier reliability, respectively.

OPA2810 BD_MutipleAmps.gifFigure 77. Multichannel Sensor Interface Using Multiple Amplifiers
OPA2810 BD_Front-Page.gifFigure 78. Multichannel Sensor Interface Using a Single Higher GBWP Amplifier

Figure 79 shows the output voltage and input differential voltage when a 8-V step is applied at the noninverting terminal of the OPA2810 configured as a unity-gain buffer of Figure 78.

OPA2810 BD_Mux_Waveform.gifFigure 79. Large-Signal Transient Response Using OPA2810

Because of the fast input transient, the amplifier is slew-limited and the inputs cease to track each other (a maximum VIN,Diff of 7V is seen in Figure 79) until the output reaches its final value and the negative feedback loop is closed. For standard amplifiers with a 0.7-1.5V maximum VIN,Diff rating, it is required to use current-limiting resistors in series with the input pins to protect from irreversible damage, which also limits the device frequency response. The OPA2810 has built-in input clamps that allow the application of as much as 7V of VIN,Diff, with no external resistors required and no damage to the device or a shift in performance specifications. Such an input-stage architecture coupled, with its fast settling performance, makes the OPA2810 a good fit for multichannel sensor multiplexed systems.