JAJSSL2 March   2024 PGA849

ADVANCE INFORMATION  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Gain Control
      2. 7.3.2 Input Protection
      3. 7.3.3 Using the Output Difference Amplifier to Shape Noise
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 ADS8860 16-Bit, 1MSPS, Single-Ended Input, SAR ADC Driver
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 PSpice® for TI
        2. 9.1.1.2 TINA-TI™シミュレーション・ソフトウェア (無償ダウンロード)
    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. 10Revision History
  12. 11Mechanical, 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

8.2.1 ADS8860 16-Bit, 1MSPS, Single-Ended Input, SAR ADC Driver

Figure 8-1 shows the schematic for the 16-bit, precision, 1MSPS, successive approximation register (SAR), analog-to-digital converter (ADC). This circuit is used to measure the driving capability of the PGA849 with the ADS8860 single-ended input ADC.

GUID-20240321-SS0I-GVZ3-C0Q0-HBTG4C9T9BFS-low.svg Figure 8-1 Driving the ADS8860 SAR ADC

The circuit accepts single-ended or differential input signals. The PGA849 operates with independent input and output power supplies. In this example, ±15V power supplies are used to power the input-stage, and a unipolar 5.3V supply powers the output-stage. The PGA849 output stage supply is powered by the same 5.3V ADC supply. The 5.3V output supply operation prevents overloading the ADC inputs during PGA overdrive conditions. The REF6250 is selected as the ADC voltage reference. The REF6250 is a low-noise, low-drift, precision, 5V reference connected to the ADS8860 reference input ADC REFIN pin.

The PGA849 output voltage is developed with respect to the REF pin. The REF pin is set to the SAR ADC midscale voltage by dividing the REF6250 ADC reference with a precision resistive voltage divider. The OPA192 buffer drives the PGA849 REF pin. The OPA192 is a precision amplifier with low offset, low drift and 10MHz bandwidth.