ZHCUAD2C October   2016  – August 2021 ADS8900B

 

  1.   摘要
  2.   商标
  3. 1EVM 概览
    1. 1.1 ADS8900EVM-PDK 套件特性
    2. 1.2 ADS8900EVM 特性
  4. 2模拟接口
    1. 2.1 ADS8900B 连接和去耦
    2. 2.2 ADC 放大器输入驱动器
    3. 2.3 电压基准和 VCM 调节
  5. 3数字接口
    1. 3.1 适用于 ADC 数字 I/O 的 multiSPI™
    2. 3.2 板载 EEPROM 的 I2C 总线
  6. 4电源
    1. 4.1 Positive Supply and Test Points
    2. 4.2 负电源
  7. 5ADS8900EVM-PDK 初始设置
    1. 5.1 软件安装
    2. 5.2 差分输入的默认跳线设置
    3. 5.3 用于双极、单端输入的默认跳线
    4. 5.4 用于单极、单端输入的默认跳线
    5. 5.5 ADS8900 评估的外部源要求
  8. 6ADS8900EVM-PDK 操作
    1. 6.1 用于 ADC 控制的 EVM GUI 全局设置
    2. 6.2 寄存器映射配置工具
    3. 6.3 时域显示工具
    4. 6.4 频谱分析工具
    5. 6.5 直方图工具
    6. 6.6 线性分析工具
    7. 6.7 ADS8900BEVM 对 ADS8910B 和 ADS8920B 器件的支持
  9. 7物料清单、PCB 布局和原理图
    1. 7.1 物料清单（BOM）
    2. 7.2 PCB 布局
    3. 7.3 原理图
  10. 8修订历史记录

4.1 Positive Supply and Test Points

The analog supply of the ADC (AVDD = 5.3 V) is powered by the TPS7A4700RGWR (U5) low-dropout regulator (LDO). The input to this LDO is the regulated 5.5-V supply from the PHI. This LDO can be programed to different voltages by soldering or desoldering resistors R42 to R48.

A test point for each power supply is provided. Furthermore, a light-emitting diode (LED) is used to indicate when the 5.5-V supply from the PHI turns on. This power turns on shortly after the software is booted. The EVM is not powered until the software is started, so TI does not recommend connecting the external signal source until the EVM is powered. Figure 4-1 shows the positive supply and test points for the TPS7A4700RGWR.

GUID-20201202-CA0I-TWR4-VTLR-2FK266FRV88X-low.gif Figure 4-1 Positive Supply and Test Points