ZHCSM18A January   2023  – December 2023 ADS9815 , ADS9817

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Switching Characteristics
    8. 5.8 Timing Diagrams
    9. 5.9 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Analog Inputs
        1. 6.3.1.1 Input Clamp Protection Circuit
        2. 6.3.1.2 Programmable Gain Amplifier (PGA)
        3. 6.3.1.3 Wide-Common-Mode Voltage Rejection Circuit
        4. 6.3.1.4 Gain Error Calibration
      2. 6.3.2 ADC Transfer Function
      3. 6.3.3 ADC Sampling Clock Input
      4. 6.3.4 Reference
        1. 6.3.4.1 Internal Reference Voltage
        2. 6.3.4.2 External Reference Voltage
      5. 6.3.5 Sample Synchronization
      6. 6.3.6 Data Interface
        1. 6.3.6.1 Data Clock Output
        2. 6.3.6.2 ADC Output Data Randomizer
        3. 6.3.6.3 Test Patterns for Data Interface
          1. 6.3.6.3.1 User-Defined Test Pattern
          2. 6.3.6.3.2 User-Defined Alternating Test Pattern
          3. 6.3.6.3.3 Ramp Test Pattern
    4. 6.4 Device Functional Modes
      1. 6.4.1 Power-Down
      2. 6.4.2 Reset
      3. 6.4.3 Initialization Sequence
      4. 6.4.4 Normal Operation
    5. 6.5 Programming
      1. 6.5.1 Register Write
      2. 6.5.2 Register Read
      3. 6.5.3 Multiple Devices: Daisy-Chain Topology for SPI Configuration
        1. 6.5.3.1 Register Write With Daisy-Chain
        2. 6.5.3.2 Register Read With Daisy-Chain
  8. 7 Register Map
    1. 7.1 Register Bank 0
    2. 7.2 Register Bank 1
    3. 7.3 Register Bank 2
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Data Acquisition (DAQ) System
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 CMOS Data Interface
      4. 8.2.4 Application Curves
    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 接收文档更新通知
    2. 9.2 支持资源
    3. 9.3 Trademarks
    4. 9.4 静电放电警告
    5. 9.5 术语表
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

封装选项

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

6.3.1.3 Wide-Common-Mode Voltage Rejection Circuit

The ADS981x features a common-mode (CM) rejection circuit at the analog inputs that supports CM voltages up to ±12 V. The CM voltage for differential inputs is given by Equation 1. On power-up or after reset, the common-mode voltage range for the analog input channels is ±12 V (WIDE_CM_EN1 = 0b). Voltage at the analog inputs, in all cases, must be within the Absolute Maximum Ratings.

Equation 2. C o m m o n   m o d e   v o l t a g e =   ( Voltage on AINP ) + ( Voltage on AINM ) 2

As described in Table 6-3, the CM voltage rejection circuit can be optimized for various CM voltages for differential inputs.

Table 6-3 Wide Common-Mode Configuration for Differential Inputs
COMMON-MODE (CM) RANGE CM_CTRL_EN ADC A
(ANALOG INPUT CHANNELS 1–4)		 ADC B
(ANALOG INPUT CHANNELS 5–8)
CM_EN_ADC_A CM_RNG_ADC_A
[1:0]		 CM_EN_ADC_B CM_RNG_ADC_B
[1:0]
CM ≤ ±1 V 1 0 Don't care 0 Don't care
CM ≤ ±RANGE / 2 1 0 1 0
CM ≤ ±6 V 2 2
CM ≤ ±12 V 1 1

The CM voltage rejection circuit must be configured depending on the analog input range of the PGA when using single-ended inputs as well. Table 6-4 lists the recommended configuration for single-ended inputs for various analog input voltage ranges.

Table 6-4 Wide Common-Mode Configuration for Single-Ended Inputs
PGA ANALOG INPUT RANGE CM_CTRL_EN ADC A
(ANALOG INPUT CHANNELS 1–4)		 ADC B
(ANALOG INPUT CHANNELS 5–8)
CM_EN_ADC_A CM_RNG_ADC_A
[1:0]		 CM_EN_ADC_B CM_RNG_ADC_B
[1:0]
±2.5 V, ±3.5 V, and ±5 V 1 0 Don't care 0 Don't care
±7 V, ±10 V, and ±12 V 1 0 1 0
千亿体育app官网登录(中国)官方网站IOS/安卓通用版/手机APP | 米乐app下载官网（中国）|ios|Android/通用版APP最新版 | 米乐|米乐·M6（中国大陆）官方网站 | 千亿体育登陆地址 | 华体会体育（中国）HTH·官方网站 | 千赢qy国际_全站最新版千赢qy国际V6.2.14安卓/IOS下载 | 18新利网v1.2.5|中国官方网站 | bob电竞真人（中国官网）安卓/ios苹果/电脑版【1.97.95版下载】 | 千亿体育app官方下载(中国)官方网站IOS/安卓/手机APP下载安装 |