JAJS498D August   2008  – August 2023 DAC5311 , DAC6311 , DAC7311

PRODUCTION DATA  

  1.   1
  2. 特長
  3. アプリケーション
  4. 概要
  5. Revision History
  6. Device Comparison
  7. Pin Configuration and Functions
  8. Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics
    6. 7.6  Timing Requirements
    7. 7.7  Timing Diagrams
    8. 7.8  Typical Characteristics: AVDD = 5 V
    9. 7.9  Typical Characteristics: AVDD = 3.6 V
    10. 7.10 Typical Characteristics: AVDD = 2.7 V
  9. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 DAC Section
      2. 8.3.2 Resistor String
      3. 8.3.3 Output Amplifier
      4. 8.3.4 Power-On Reset
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Down Modes
    5. 8.5 Programming
      1. 8.5.1 Serial Interface
        1. 8.5.1.1 Input Shift Register
        2. 8.5.1.2 SYNC Interrupt
  10. Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Microprocessor Interfacing
        1. 9.1.1.1 DACx311 to 8051 Interface
        2. 9.1.1.2 DACx311 to Microwire Interface
        3. 9.1.1.3 DACx311 to 68HC11 Interface
    2. 9.2 Typical Applications
      1. 9.2.1 Loop Powered Transmitter
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Using the REF5050 as a Power Supply for the DACx311
      3. 9.2.3 Bipolar Operation Using the DACx311
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 ドキュメントの更新通知を受け取る方法
    2. 10.2 サポート・リソース
    3. 10.3 Trademarks
    4. 10.4 静電気放電に関する注意事項
    5. 10.5 用語集
  12. 11Mechanical, Packaging, and Orderable Information

Layout Guidelines

A precision analog component requires careful layout, adequate bypassing, and clean, well-regulated power supplies.

The DACx311 offers single-supply operation, and is often used in close proximity to digital logic, microcontrollers, microprocessors, and digital signal processors. The more digital logic present in the design and the higher the switching speed, the more difficult the task is to achieve good performance from the converter.

As a result of the single ground pin of the DACx311, all return currents, including digital and analog return currents, must flow through the GND pin. Ideally, GND is connected directly to an analog ground plane. Separate this plane from the ground connection for the digital components until connected at the power entry point of the system.

The power applied to AVDD must be well-regulated and low-noise. Switching power supplies and dc/dc converters often have high-frequency glitches or spikes riding on the output voltage. In addition, digital components can create similar high-frequency spikes as the internal logic switches state. This noise can easily couple into the DAC output voltage through various paths between the power connections and analog output. This condition is particularly true for the DACx311, as the power supply is also the reference voltage for the DAC.

As with the GND connection, connect AVDD to a 5‑V power supply plane or trace that is separate from the connection for digital logic until connected at the power entry point. In addition, 1-μF to 10-μF and 0.1-μF bypass capacitors are strongly recommended. In some situations, additional bypassing can be required, such as a 100 μF electrolytic capacitor or even a Pi filter made up of inductors and capacitors—all designed to essentially low-pass filter the 5-V supply and remove high-frequency noise.