ZHCSIJ5C August   2018  – June 2019 ADS9224R , ADS9234R

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      典型应用图
  4. 4 修订历史记录
  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: ADS92x4R
    6. 6.6  Electrical Characteristics: ADS9224R
    7. 6.7  Electrical Characteristics: ADS9234R
    8. 6.8  Timing Requirements
    9. 6.9  Switching Characteristics
    10. 6.10 Typical Characteristics: ADS9224R
    11. 6.11 Typical Characteristics: ADS9234R
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Converter Modules
        1. 7.3.1.1 Analog Input With Sample-and-Hold
        2. 7.3.1.2 ADC Transfer Function
      2. 7.3.2 Internal Reference Voltage
      3. 7.3.3 Reference Buffers
      4. 7.3.4 REFby2 Buffer
      5. 7.3.5 Data Averaging
        1. 7.3.5.1 Averaging of Two Samples
        2. 7.3.5.2 Averaging of Four Samples
    4. 7.4 Device Functional Modes
      1. 7.4.1 ACQ State
      2. 7.4.2 CNV State
      3. 7.4.3 Reset or Power-Down
        1. 7.4.3.1 Reset
        2. 7.4.3.2 Power-Down
      4. 7.4.4 Conversion Control and Data Transfer Frame
        1. 7.4.4.1 Conversion Control and Data Transfer Frame With Zero Cycle Latency (Zone 1 Transfer)
        2. 7.4.4.2 Conversion Control and Data Transfer Frame With Wide Read Cycle (Zone 2 Transfer)
    5. 7.5 READY/STROBE Output
      1. 7.5.1 READY Output
      2. 7.5.2 STROBE Output
    6. 7.6 Programming
      1. 7.6.1 Output Data Word
      2. 7.6.2 Data Transfer Protocols
        1. 7.6.2.1 Protocols for Reading From the Device
          1. 7.6.2.1.1 Legacy, SPI-Compatible Protocols (SPI-xy-S-SDR)
          2. 7.6.2.1.2 SPI-Compatible Protocols With Bus Width Options and Single Data Rate (SPI-xy-D-SDR and SPI-xy-Q-SDR)
          3. 7.6.2.1.3 SPI-Compatible Protocols With Bus Width Options and Double Data Rate (SPI-x1-S-DDR, SPI-x1-D-DDR, SPI-x1-Q-DDR)
          4. 7.6.2.1.4 Clock Re-Timer (CRT) Protocols (CRT-S-SDR, CRT-D-SDR, CRT-Q-SDR, CRT-S-DDR, CRT-D-DDR, CRT-Q-DDR)
          5. 7.6.2.1.5 Parallel Byte Protocols (PB-xy-AB-SDR, PB-xy-AA-SDR)
        2. 7.6.2.2 Device Setup
          1. 7.6.2.2.1 Single Device: All Enhanced-SPI Options
          2. 7.6.2.2.2 Single Device: Minimum Pins for a Standard SPI Interface
        3. 7.6.2.3 Protocols for Configuring the Device
      3. 7.6.3 Reading and Writing Registers
    7. 7.7 Register Maps
      1. 7.7.1 ADS92x4R Registers
        1. 7.7.1.1 DEVICE_STATUS Register (Offset = 0h) [reset = 0h]
          1. Table 12. DEVICE_STATUS Register Field Descriptions
        2. 7.7.1.2 POWER_DOWN_CFG Register (Offset = 1h) [reset = 0h]
          1. Table 13. POWER_DOWN_CFG Register Field Descriptions
        3. 7.7.1.3 PROTOCOL_CFG Register (Offset = 2h) [reset = 0h]
          1. Table 14. PROTOCOL_CFG Register Field Descriptions
        4. 7.7.1.4 BUS_WIDTH Register (Offset = 3h) [reset = 0h]
          1. Table 15. BUS_WIDTH Register Field Descriptions
        5. 7.7.1.5 CRT_CFG Register (Offset = 4h) [reset = 0h]
          1. Table 16. CRT_CFG Register Field Descriptions
        6. 7.7.1.6 OUTPUT_DATA_WORD_CFG Register (Offset = 5h) [reset = 0h]
          1. Table 17. OUTPUT_DATA_WORD_CFG Register Field Descriptions
        7. 7.7.1.7 DATA_AVG_CFG Register (Offset = 6h) [reset = 0h]
          1. Table 18. DATA_AVG_CFG Register Field Descriptions
        8. 7.7.1.8 REFBY2_OFFSET Register (Offset = 7h) [reset = 0h]
          1. Table 19. REFBY2_OFFSET Register Field Descriptions
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 ADC Input Driver
        1. 8.1.1.1 Charge-Kickback Filter
      2. 8.1.2 Input Amplifier Selection
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 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 器件支持
      1. 11.1.1 开发支持
    2. 11.2 相关文档
    3. 11.3 相关链接
    4. 11.4 接收文档更新通知
    5. 11.5 社区资源
    6. 11.6 商标
    7. 11.7 静电放电警告
    8. 11.8 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

7.6.2.1.2 SPI-Compatible Protocols With Bus Width Options and Single Data Rate (SPI-xy-D-SDR and SPI-xy-Q-SDR)

In this data transfer protocol, the bus width of reading data from each ADC can be increased to two SDOs or four SDOs. All combinations of clock phase and polarity are supported. The read time required for reading the output data word reduces with increases in bus width and, thus, tCYCLE for zone 1 transfer reduces. The SDOs that are not enabled by the BUS_WIDTH register are set to tri-state. Table 4 provides the details of different SPI protocols with bus width options and single data rate to read data from the device.

Table 4. SPI-xy-D-SDR and SPI-xy-Q-SDR Protocols for Reading From Device

PROTOCOL(3) SCLK POLARITY (CPOL)(4) SCLK PHASE (CPHA)(1)(2) MSB LAUNCH EDGE BUS WIDTH(7) tREAD(5)(6) TIMING DIAGRAM
SPI-00-D-SDR Low (CPOL = 0) Rising (CPHA = 0) CS falling 2 [7.5 × tCLK + k] Figure 49
SPI-01-D-SDR Low (CPOL = 0) Falling (CPHA = 1) 1st SCLK rising 2 [7.5 × tCLK + k] Figure 50
SPI-10-D-SDR High (CPOL = 1) Falling (CPHA = 0) CS falling 2 [7.5 × tCLK + k] Figure 49
SPI-11-D-SDR High (CPOL = 1) Rising (CPHA = 1) 1st SCLK falling 2 [7.5 × tCLK + k] Figure 50
SPI-00-Q-SDR Low (CPOL = 0) Rising (CPHA = 0) CS falling 4 [3.5 × tCLK + k] Figure 51
SPI-01-D-SDR Low (CPOL = 0) Falling (CPHA = 1) 1st SCLK rising 4 [3.5 × tCLK + k] Figure 52
SPI-10-D-SDR High (CPOL = 1) Falling (CPHA = 0) CS falling 4 [3.5 × tCLK + k] Figure 51
SPI-11-D-SDR High (CPOL = 1) Rising (CPHA = 1) 1st SCLK falling 4 [3.5 × tCLK + k] Figure 52
(1) With SCLK ≥ 30 MHz, TI recommends data capture on the launch edge for the next bit.
(2) With SCLK < 30 MHz, data can be captured either on the same edge as the SCLK phase or on the launch edge for the next bit.
(3) For SPI-compatible protocols with bus width options and SDR, set the SDO_PROTOCOL bits in the PROTOCOL_CFG register to 000b.
(4) Configure the SPI_CPOL and SPI_CPHA bits in the PROTOCOL_CFG register for the desired CPOL and CPHA.
(5) tREAD is the read time for reading the 16-bit output data word. k = (tSU_CSCK + tHT_CKCS).
(6) For ADS9234R devices, the read time for reading the 14-bit output data word is [6.5 × tCLK + k] for a bus width of 2 and [3.5 × tCLK + k] for a bus width of 4.
(7) For configuring the bus width, configure the BUS_WIDTH register.

Figure 49, Figure 50, Figure 51, and Figure 52 show timing diagrams for the SPI-00-D-SDR and SPI-10-D-SDR, SPI-01-D-SDR and SPI-11-D-SDR, SPI-00-Q-SDR and SPI-10-Q-SDR, and SPI-01-Q-SDR and SPI-11-Q-SDR protocols, respectively.

ADS9224R ADS9234R SPI-x0-D-SDR-SBAS876.gifFigure 49. SPI-00-D-SDR and SPI-10-D-SDR Protocols
ADS9224R ADS9234R SPI-x0-Q-SDR-SBAS876.gifFigure 51. SPI-00-Q-SDR and SPI-10-Q-SDR Protocols
ADS9224R ADS9234R SPI-x1-D-SDR-SBAS876.gifFigure 50. SPI-01-D-SDR and SPI-11-D-SDR Protocols
ADS9224R ADS9234R SPI-x1-Q-DDR-SBAS876.gifFigure 52. SPI-01-Q-SDR and SPI-11-Q-SDR Protocols
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