ZHCSFE1B June   2016  – August 2017 ADS8920B , ADS8922B , ADS8924B

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      使用 ADS89xxB 集成功能轻松实现 系统设计
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  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 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Switching Characteristics
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 LDO Module
      2. 7.3.2 Reference Buffer Module
      3. 7.3.3 Converter Module
        1. 7.3.3.1 Sample-and-Hold Circuit
        2. 7.3.3.2 Internal Oscillator
        3. 7.3.3.3 ADC Transfer Function
      4. 7.3.4 Interface Module
    4. 7.4 Device Functional Modes
      1. 7.4.1 RST State
      2. 7.4.2 ACQ State
      3. 7.4.3 CNV State
    5. 7.5 Programming
      1. 7.5.1 Output Data Word
      2. 7.5.2 Data Transfer Frame
      3. 7.5.3 Interleaving Conversion Cycles and Data Transfer Frames
      4. 7.5.4 Data Transfer Protocols
        1. 7.5.4.1 Protocols for Configuring the Device
        2. 7.5.4.2 Protocols for Reading From the Device
          1. 7.5.4.2.1 Legacy, SPI-Compatible (SYS-xy-S) Protocols
          2. 7.5.4.2.2 SPI-Compatible Protocols with Bus Width Options
          3. 7.5.4.2.3 Source-Synchronous (SRC) Protocols
            1. 7.5.4.2.3.1 Output Clock Source Options with SRC Protocols
            2. 7.5.4.2.3.2 Bus Width Options With SRC Protocols
            3. 7.5.4.2.3.3 Output Data Rate Options With SRC Protocols
      5. 7.5.5 Device Setup
        1. 7.5.5.1 Single Device: All multiSPI Options
        2. 7.5.5.2 Single Device: Minimum Pins for a Standard SPI Interface
        3. 7.5.5.3 Multiple Devices: Daisy-Chain Topology
        4. 7.5.5.4 Multiple Devices: Star Topology
    6. 7.6 Register Maps
      1. 7.6.1 Device Configuration and Register Maps
        1. 7.6.1.1 PD_CNTL Register (address = 04h) [reset = 00h]
          1. Table 11. PD_CNTL Register Field Descriptions
        2. 7.6.1.2 SDI_CNTL Register (address = 008h) [reset = 00h]
          1. Table 12. SDI_CNTL Register Field Descriptions
        3. 7.6.1.3 SDO_CNTL Register (address = 0Ch) [reset = 00h]
          1. Table 13. SDO_CNTL Register Field Descriptions
        4. 7.6.1.4 DATA_CNTL Register (address = 010h) [reset = 00h]
          1. Table 14. DATA_CNTL Register Field Descriptions
        5. 7.6.1.5 PATN_LSB Register (address = 014h) [reset = 00h]
          1. Table 15. PATN_LSB Register Field Descriptions
        6. 7.6.1.6 PATN_MID Register (address = 015h) [reset = 00h]
          1. Table 16. PATN_MID Register Field Descriptions
        7. 7.6.1.7 PATN_MSB Register (address = 016h) [reset = 00h]
          1. Table 17. PATN_MSB Register Field Descriptions
        8. 7.6.1.8 OFST_CAL Register (address = 020h) [reset = 00h]
          1. Table 18. OFST_CAL Register Field Descriptions
        9. 7.6.1.9 REF_MRG Register (address = 030h) [reset = 00h]
          1. Table 19. REF_MRG Register Field Descriptions
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 ADC Reference Driver
      2. 8.1.2 ADC Input Driver
        1. 8.1.2.1 Charge-Kickback Filter
        2. 8.1.2.2 Input Amplifier Selection
    2. 8.2 Typical Application
      1. 8.2.1 Data Acquisition (DAQ) Circuit for Lowest Distortion and Noise Performance With Differential Input
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 DAQ Circuit With FDA Input Driver and Single-Ended or Differential Input
      3. 8.2.3 Design Requirements
      4. 8.2.4 Detailed Design Procedure
      5. 8.2.5 Application Curves
  9. 9 Power-Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Signal Path
      2. 10.1.2 Grounding and PCB Stack-Up
      3. 10.1.3 Decoupling of Power Supplies
      4. 10.1.4 Reference Decoupling
      5. 10.1.5 Differential Input Decoupling
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 Documentation Support
      1. 11.1.1 相关文档
    2. 11.2 相关链接
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 社区资源
    5. 11.5 商标
    6. 11.6 静电放电警告
    7. 11.7 Glossary
  12. 12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

6.6 Timing Requirements

MINTYPMAXUNITTIMING DIAGRAM
CONVERSION CYCLE
fcycle Sampling frequency ADS8920B 1000 kHz Figure 1
ADS8922B 500
ADS8924B 250
tcycle ADC cycle-time period ADS8920B 1 µs
ADS8922B 2
ADS8924B 4
twh_CONVST Pulse duration: CONVST high 30 ns
twl_CONVST Pulse duration: CONVST low 30 ns
tacq Acquisition time 300 ns
tqt_acq Quiet acquisition time 30 ns Figure 46, see Data Transfer Protocols
td_cnvcap Quiet aperture time 20 ns
ASYNCHRONOUS RESET, AND LOW POWER MODES
twl_RST Pulse duration: RST low 100 ns Figure 2
SPI-COMPATIBLE SERIAL INTERFACE
fCLK Serial clock frequency 2.35 V ≤ DVDD ≤ 5.5 V,
TA = –40°C to +125°C,
VIH > 0.7 DVDD, VIL < 0.3 DVDD		 70 MHz Figure 3
1.65 V ≤ DVDD < 2.35 V,
TA = –40°C to +125°C,
VIH > 0.8 DVDD, VIL < 0.2 DVDD		 20
1.65 V ≤ DVDD < 2.35 V,
TA = 0°C to +60°C,
VIH > 0.8 DVDD, VIL < 0.2 DVDD		 57
1.65 V ≤ DVDD < 2.35 V,
TA = –40°C to +125°C,
VIH > 0.9 DVDD, VIL < 0.1 DVDD		 68
tCLK Serial clock time period 1/fCLK ns Figure 3
tph_CK SCLK high time 0.45 0.55 tCLK Figure 3
tpl_CK SCLK low time 0.45 0.55 tCLK
tsu_CSCK Setup time: CS falling to the first SCLK capture edge 12 ns
tsu_CKDI Setup time: SDI data valid to the SCLK capture edge 1.5 ns
tht_CKDI Hold time: SCLK capture edge to (previous) data valid on SDI 1 ns
tht_CKCS Delay time: last SCLK falling to CS rising 7 ns
SOURCE-SYNCHRONOUS SERIAL INTERFACE (External Clock)(1)
fCLK Serial clock frequency SDR (DATA_RATE = 0b),
2.35 V ≤ DVDD ≤ 5.5 V		 70 MHz Figure 4, see Data Transfer Protocols
DDR (DATA_RATE = 1b),
2.35 V ≤ DVDD ≤ 5.5 V		 35
tCLK Serial clock time period 1/fCLK ns
(1) The external clock option is not recommended when operating with DVDD < 2.35 V. See Table 9.
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