ZHCSBO2H December   2012  – July 2014 AFE4400

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  5. 5 Device Family Options
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling 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 Requirements: Supply Ramp and Power-Down
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Receiver Channel
        1. 8.3.1.1 Receiver Front-End
        2. 8.3.1.2 Ambient Cancellation Scheme and Second Stage Gain Block
        3. 8.3.1.3 Receiver Control Signals
        4. 8.3.1.4 Receiver Timing
      2. 8.3.2 Clocking and Timing Signal Generation
      3. 8.3.3 Timer Module
        1. 8.3.3.1 Using the Timer Module
      4. 8.3.4 Receiver Subsystem Power Path
      5. 8.3.5 Transmit Section
        1. 8.3.5.1 Transmitter Power Path
        2. 8.3.5.2 LED Power Reduction During Periods of Inactivity
    4. 8.4 Device Functional Modes
      1. 8.4.1 ADC Operation and Averaging Module
        1. 8.4.1.1 Operation
      2. 8.4.2 Diagnostics
        1. 8.4.2.1 Photodiode-Side Fault Detection
        2. 8.4.2.2 Transmitter-Side Fault Detection
        3. 8.4.2.3 Diagnostics Module
    5. 8.5 Programming
      1. 8.5.1 Serial Programming Interface
      2. 8.5.2 Reading and Writing Data
        1. 8.5.2.1 Writing Data
        2. 8.5.2.2 Reading Data
        3. 8.5.2.3 Multiple Data Reads and Writes
        4. 8.5.2.4 Register Initialization
        5. 8.5.2.5 AFE SPI Interface Design Considerations
    6. 8.6 Register Maps
      1. 8.6.1 AFE Register Map
      2. 8.6.2 AFE Register Description
  9. 9 Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 Trademarks
    2. 12.2 Electrostatic Discharge Caution
    3. 12.3 术语表
  13. 13机械封装和可订购信息

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

1 特性

  • 完全集成 模拟前端，用于脉冲血氧仪 应用范围：
    • 灵活的脉冲排序和
      定时控制
  • 发射：
    • 集成发光二极管 (LED) 驱动器
      （H 桥、推挽）
    • 动态范围：95dB
    • LED 电流：
      • 可编程至具有 8 位电流分辨率的 50mA 电流
    • 低功耗：
      • 100µA + 平均 LED 电流
    • 可编程 LED 接通时间
    • 独立的 LED2 和 LED1 电流基准
  • 具有高动态范围的接收通道：
    • 13 个无噪声位
    • 低功率：在使用 3.3V 电源供电时小于 670µA
    • 集成数字环境估算和删减
    • 灵活的接收采样时间
    • 具有可编程 LED 设置的灵活转阻放大器
  • 集成式故障诊断：
    • 光电二极管和 LED 开路与
      短路检测
    • 线缆接通和断开检测
  • 电源：
    • Rx = 2.0V 至 3.6V
    • Tx = 3.0V 至 5.25V
  • 封装：紧凑型超薄四方扁平无引线 (VQFN)-40 (6mm x 6mm)
  • 额定温度范围： 0°C 至 70°C

2 应用

  • 低成本 医疗脉冲血氧仪应用
  • 光学心率监视器 (HRM)
  • 工业光测量应用

3 说明

AFE4400 是一款非常适合于脉冲血氧仪应用的完全集成模拟前端 (AFE)。 此器件包含一个具有集成模数转换器 (ADC) 的低噪声接收器通道、一个 LED 发射部件和针对传感器以及 LED 故障检测的诊断功能。 此器件是一款可配置定时控制器。 这个灵活性使得用户能够完全控制器件定时特性。 为了简化计时要求并为 AFE4400 提供一个低抖动时钟，还集成了一个由外部晶振供频的振荡器。 此器件使用一个 SPI™ 接口与外部微控制器或主机处理器通信。

此器件是一个单体、紧凑型 VQFN-40 封装 (6mm x 6mm) 内的完整 AFE 解决方案，其额定工作温度范围为 0°C 至 70°C。

器件信息(1)

部件号 封装 封装尺寸（标称值）
AFE4400 VQFN (40) 6.00mm x 6.00mm
  1. 如需了解所有可用封装，请见数据表末尾的可订购产品附录。
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4 修订历史记录

Changes from G Revision (July 2014) to H Revision

  • Changed HBM value from ±4000 to ±1000 in Handling Ratings table Go
  • Changed CDM value from ±1500 to ±250 in Handling Ratings table Go

Changes from F Revision (October 2013) to G Revision

  • 已将格式更改为符合最新的数据表标准；已添加全新章节，并已删除现有章节Go
  • Changed 发射 特性着重号的子着重号Go
  • Changed 集成故障诊断 特性着重号的第二子着重号Go
  • Added AFE4403 row to Family and Ordering Information tableGo
  • Changed title of Device Family Options tableGo
  • Changed INM to INN in VCM description of Pin Descriptions tableGo
  • Changed Absolute Maximum Ratings table: changed first five rows and added TXP, TXN pins rowGo
  • Deleted Typical value (> 1.3) for Logic high input voltage Go
  • Deleted Typical value (> -0.4) for Logic low input voltage Go
  • Changed SPISTE, SPISIMO, and SPISOMI pin names in Figure 1Go
  • Changed SPISTE and SPISIMO pin names in Figure 2Go
  • Added second and third paragraphs to the Receiver Front-End section Go
  • Changed seventh paragraph in Receiver Front-End sectionGo
  • Changed title of Ambient Cancellation Scheme and Second Stage Gain Block sectionGo
  • Changed descriptions of LED2, ambient, and LED1 convert phases in Receiver Control Signals sectionGo
  • Changed description of Receiver Timing section Go
  • Changed Example column values for rows t2, t4, t5, t11, t13, t15, t17, t19, t22, t24, t26, and t28 in Table 2Go
  • Added footnote 2 to Table 2Go
  • Added footnote 2 to Figure 42Go
  • Added footnote 2 to Figure 43Go
  • Changed the ADC Operation and Averaging Module section: grammatical edits and changed the second sentence of the second paragraphGo
  • Changed INN pin name in Figure 53Go
  • Changed INM to INN in Table 5Go
  • Changed SPISTE, SPISIMO, SPISOMI, and SCLK pin names in Figure 58Go
  • Added Application and Implementation sectionGo

Changes from E Revision (October 2013) to F Revision

  • Changed footnote 1 in Recommended Operating Conditions tableGo
  • Changed LED_DRV_SUP parameter in Recommended Operating Conditions tableGo
  • Changed TXM to TXN in VLED footnote of Recommended Operating Conditions tableGo
  • Changed Transmitter, Voltage on TXP (or TXN) pin parameter in Electrical Characteristics tableGo
  • Changed Figure 54 (changed TXP and TXN pin names, deleted LED 1 and LED 2 pin names)Go

Changes from D Revision (May 2013) to E Revision

  • Deleted 芯片图Go
  • Changed 第 3 特性着重号的第 1 个子着重号Go
  • Changed 电源特性着重号的最后一个子着重号Go
  • 已更新首页图形Go
  • Changed Tx Power Supply column in Family and Ordering Information tableGo
  • Changed TX_REF description in Pin Descriptions tableGo
  • Changed TX_CTRL_SUP value in Recommended Operating Conditions tableGo
  • Changed conditions for Electrical Characteristics tableGo
  • Changed Performance, PRF parameter minimum specification in Electrical Characteristics tableGo
  • Deleted Performance, IIN_FS parameter from Electrical Characteristics tableGo
  • Changed Performance, CMRR parameter in Electrical Characteristics tableGo
  • Changed Performance (Full-Signal Chain), Total integrated noise current and NFB parameter test conditions in Electrical Characteristics tableGo
  • Changed Receiver Functional Block Level Specification, Total integrated noise current parameter test conditions in Electrical Characteristics tableGo
  • Changed Ambient Cancellation Stage, Gain parameter in Electrical Characteristics tableGo
  • Added Low-Pass Filter, Filter settling time parameter to Electrical Characteristics tableGo
  • Changed Diagnostics, Duration of diagnostics state machine parameter unit value in Electrical Characteristics tableGo
  • Changed External Clock, Maximum allowable external clock jitter parameter in Electrical Characteristics tableGo
  • Updated Figure 8 to Figure 10Go
  • Updated Figure 11 to Figure 16Go
  • Updated Figure 17 to Figure 19Go
  • Updated Figure 31 and Figure 32Go
  • Updated functional block diagramGo
  • Updated Figure 34Go
  • Changed second sentence in second paragraph of Receiver Front-End sectionGo
  • Changed third paragraph of Receiver Front-End sectionGo
  • Changed second paragraph of Ambient Cancellation Scheme sectionGo
  • Added last paragraph and Table 1 to Ambient Cancellation Scheme sectionGo
  • Updated Figure 37Go
  • Updated Figure 39Go
  • Added footnote 1 to Table 2Go
  • Changed example column in Table 2Go
  • Added last sentence to third column of row t13 in Table 2Go
  • Deleted last sentence from third column of row t14 in Table 2Go
  • Changed corresponding register address name in row t21 of Table 2Go
  • Updated Figure 42Go
  • Updated Figure 43Go
  • Updated Figure 44Go
  • Changed entire Transmit SectionGo
  • Changed second paragraph of the ADC Operation and Averaging Module sectionGo
  • Updated Figure 49Go
  • Changed Operation section title and first sentenceGo
  • Changed last sentence of the Operation With Averaging section Go
  • Updated Figure 52Go
  • Changed last paragraph of Diagnostics Module sectionGo
  • Added first and last sentence to Writing Data sectionGo
  • Changed second to last sentence in Writing Data sectionGo
  • Added first and last sentence to Reading Data sectionGo
  • Changed second to last sentence in Reading Data sectionGo
  • Added Multiple Data Reads and Writes sectionGo
  • Added last sentence to the AFE SPI Interface Design Considerations sectionGo
  • Added Register Control column to Table 6Go
  • Changed name of ADCRSTSTCT0 register (address 15h) in Table 6Go
  • Changed bit D10 in CONTROL2 row of Table 6Go
  • Changed CONTROL0 paragraph descriptionGo
  • Added note to bit D2 description of CONTROL0 registerGo
  • Corrected bit names in ADCRSTSTCT0 registerGo
  • Changed PRPCOUNT[15:0] (bits D[15:0]) description of PRPCOUNT registerGo
  • Changed note within CLKALMPIN[2:0] (bits D[11:9]) description of CONTROL1 registerGo
  • Changed second and third columns of Table 7Go
  • Changed 001 and 011 bit settings for the STG2GAIN[2:0] bits (bits D[10:8]) in the TIA_AMB_GAIN registerGo
  • Changed bit D10 of the CONTROL2 registerGo