ZHCSHX9L November   2008  – February 2019 ADC14155QML-SP

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
    1.     框图
  3. 3 说明
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin Descriptions and Equivalent Circuits
  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  ADC14155 Converter Electrical Characteristics DC Parameters
    6. 6.6  ADC14155 Converter Electrical Characteristics (Continued) DYNAMIC Parameters
    7. 6.7  ADC14155 Converter Electrical Characteristics (Continued) Logic and Power Supply Electrical Characteristics
    8. 6.8  ADC14155 Converter Electrical Characteristics (Continued) Timing and AC Characteristics
    9. 6.9  Timing Diagram
    10. 6.10 Transfer Characteristic
    11. 6.11 Typical Performance Characteristics, DNL, INL
    12. 6.12 Typical Performance Characteristics, Dynamic Performance
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Inputs
        1. 7.3.1.1 Differential Analog Input Pins
        2. 7.3.1.2 Driving The Analog Inputs
        3. 7.3.1.3 Input Common Mode Voltage
      2. 7.3.2 Reference Pins
      3. 7.3.3 Digital Inputs
        1. 7.3.3.1 Clock Inputs
        2. 7.3.3.2 Power-Down (PD)
        3. 7.3.3.3 Clock Mode Select/Data Format (CLK_SEL/DF)
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
    3. 8.3 Radiation Environments
      1. 8.3.1 Total Ionizing Dose (TID)
      2. 8.3.2 Single Event Effects
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 器件命名规则
    2. 11.2 接收文档更新通知
    3. 11.3 社区资源
    4. 11.4 商标
    5. 11.5 静电放电警告
    6. 11.6 术语表
  12. 12机械、封装和可订购信息

封装选项

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
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散热焊盘机械数据 (封装 | 引脚)
订购信息

7.3.2 Reference Pins

The ADC14155QML-SP is designed to operate with an internal 1-V reference, or an external 1-V reference, but performs well with external reference voltages in the range of 0.9 V to 1.1 V. The internal 1-V reference is the default condition when no external reference input is applied to the VREF pin. If a voltage in the range of 0.9 V to 1.1 V is applied to the VREF pin, then that voltage is used for the reference. The VREF pin should always be bypassed to ground with a 0.1-µF capacitor close to the reference input pin. Lower reference voltages will decrease the signal-to-noise ratio (SNR) of the ADC14155. Increasing the reference voltage (and the input signal swing) beyond 1.1-V may degrade THD for a full-scale input, especially at higher input frequencies.

It is important that all grounds associated with the reference voltage and the analog input signal make connection to the ground plane at a single, quiet point to minimize the effects of noise currents in the ground path.

The Reference Bypass Pins (VRP, VRM, and VRN) are made available for bypass purposes. Each of these pins should be bypassed to ground with a 0.1-µF capacitor. A 0.1-µF and a 10-µF capacitor should be placed between the VRP and VRN pins, as shown in Figure 24. This configuration is necessary to avoid reference oscillation, which could result in reduced SFDR and/or SNR. VRM may be loaded to 1 mA for use as a temperature stable 1.5-V reference. The  VRP and  VRN pins should not be loaded.

Smaller capacitor values than those specified will allow faster recovery from the power down mode, but may result in degraded noise performance. Loading any of these pins, other than VRM, may result in performance degradation.

The nominal voltages for the reference bypass pins are as follows:

 VRM = 1.5 V

 VRP = VRM + VREF / 2

 VRN = VRM – VREF / 2