JAJS367B january   2000  – june 2023 XTR115 , XTR116

PRODUCTION DATA  

  1.   1
  2. 特長
  3. アプリケーション
  4. 概要
  5. Revision History
  6. Pin Configuration and Functions
  7. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Recommended Operating Conditions
    3. 6.3 Thermal Information
    4. 6.4 Electrical Characteristics
    5. 6.5 Typical Characteristics
  8. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Reverse-Voltage Protection
      2. 7.3.2 Overvoltage Surge Protection
  9. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 External Transistor
      2. 8.1.2 Minimum Scale Current
      3. 8.1.3 Offsetting the Input
      4. 8.1.4 Maximum Output Current
      5. 8.1.5 Radio Frequency Interference
      6. 8.1.6 Circuit Stability
  10. Device and Documentation Support
    1. 9.1 Device Support
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 ドキュメントの更新通知を受け取る方法
    4. 9.4 サポート・リソース
    5. 9.5 Trademarks
    6. 9.6 静電気放電に関する注意事項
    7. 9.7 用語集
  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

Circuit Stability

The 4-20 mA control-loop stability must be evaluated for any XTR11x design. A 10‑nF decoupling capacitor between V+ and IO is recommended for most applications. As this capacitance appears in parallel with the load resistance RLOAD from a stability perspective, the capacitor and resistor form a filter corner that can limit the bandwidth of the system. Therefore, for HART applications, use a bypass capacitance of 2 nF to 3 nF instead.

For applications with EMI and EMC concerns, use a bypass capacitor with sufficiently low ESR to decouple any ripple voltage from the VLOOP supply. Otherwise, the ripple voltage couples onto the 4‑mA to 20‑mA current source, and appears as noise across RLOAD after the current-to-voltage conversion.

Additionally, stability concerns apply to the VREF reference buffer when driving capacitive loads. Figure 8-4 shows that two filtering capacitors are required, one CHF of 10 pF to 0.5 µF and another CLF of 2.2 µF to 22 µF. Either a series isolation resistance RISO or a snubber RCOMP is used, depending on application requirements.

GUID-20220329-SS0I-7Z2Q-LV2F-ZGQ7WV2BJMF0-low.svg
(1) Required compensation components.
Figure 8-4 Stable Operation With Capacitive Load on VREF