ZHCSIG8A July   2018  – November 2018 DAC61408 , DAC71408 , DAC81408

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      功能方框图
  4. 4 修订历史记录
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD 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 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Digital-to-Analog Converters (DACs) Architecture
        1. 9.3.1.1 DAC Transfer Function
        2. 9.3.1.2 DAC Register Structure
          1. 9.3.1.2.1 DAC Register Synchronous and Asynchronous Updates
          2. 9.3.1.2.2 Broadcast DAC Register
          3. 9.3.1.2.3 Clear DAC Operation
      2. 9.3.2 Internal Reference
      3. 9.3.3 Device Reset Options
        1. 9.3.3.1 Power-on-Reset (POR)
        2. 9.3.3.2 Hardware Reset
        3. 9.3.3.3 Software Reset
      4. 9.3.4 Thermal Protection
        1. 9.3.4.1 Analog Temperature Sensor: TEMPOUT Pin
        2. 9.3.4.2 Thermal Shutdown
    4. 9.4 Device Functional Modes
      1. 9.4.1 Toggle Mode
      2. 9.4.2 Differential Mode
      3. 9.4.3 Power-Down Mode
    5. 9.5 Programming
      1. 9.5.1 Stand-Alone Operation
        1. 9.5.1.1 Streaming Mode Operation
      2. 9.5.2 Daisy-Chain Operation
      3. 9.5.3 Frame Error Checking
    6. 9.6 Register Maps
      1. 9.6.1  NOP Register (Offset = 00h) [reset = 0000h]
        1. Table 9. NOP Register Field Descriptions
      2. 9.6.2  DEVICEID Register (Offset = 01h) [reset = ----h]
        1. Table 10. DEVICEID Register Field Descriptions
      3. 9.6.3  STATUS Register (Offset = 02h) [reset = 0000h]
        1. Table 11. STATUS Register Field Descriptions
      4. 9.6.4  SPICONFIG Register (Offset = 03h) [reset = 0A24h]
        1. Table 12. SPICONFIG Register Field Descriptions
      5. 9.6.5  GENCONFIG Register (Offset = 04h) [reset = 7F00h]
        1. Table 13. GENCONFIG Register Field Descriptions
      6. 9.6.6  BRDCONFIG Register (Offset = 05h) [reset = FFFFh]
        1. Table 14. BRDCONFIG Register Field Descriptions
      7. 9.6.7  SYNCCONFIG Register (Offset = 06h) [reset = 0000h]
        1. Table 15. SYNCCONFIG Register Field Descriptions
      8. 9.6.8  TOGGCONFIG0 Register (Offset = 07h) [reset = 0000h]
        1. Table 16. TOGGCONFIG0 Register Field Descriptions
      9. 9.6.9  TOGGCONFIG1 Register (Offset = 08h) [reset = 0000h]
        1. Table 17. TOGGCONFIG1 Register Field Descriptions
      10. 9.6.10 DACPWDWN Register (Offset = 09h) [reset = FFFFh]
        1. Table 18. DACPWDWN Register Field Descriptions
      11. 9.6.11 DACRANGEn Register (Offset = 0Bh - 0Ch) [reset = 0000h]
        1. Table 19. DACRANGEn Register Field Descriptions
      12. 9.6.12 TRIGGER Register (Offset = 0Eh) [reset = 0000h]
        1. Table 20. TRIGGER Register Field Descriptions
      13. 9.6.13 BRDCAST Register (Offset = 0Fh) [reset = 0000h]
        1. Table 21. BRDCAST Register Field Descriptions
      14. 9.6.14 DACn Register (Offset = 14h - 1Bh) [reset = 0000h]
        1. Table 22. DACn Register Field Descriptions
      15. 9.6.15 OFFSETn Register (Offset = 21h - 22h) [reset = 0000h]
        1. Table 23. OFFSETn Register Field Descriptions
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure for Remote Ground Tracking
        1. 10.2.2.1 Generating 300mV Offset
        2. 10.2.2.2 Amplifier Selection
        3. 10.2.2.3 Passive Component Selection
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13器件和文档支持
    1. 13.1 文档支持
    2. 13.2 相关链接
    3. 13.3 接收文档更新通知
    4. 13.4 社区资源
    5. 13.5 商标
    6. 13.6 静电放电警告
    7. 13.7 术语表
  14. 14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

9.5.3 Frame Error Checking

If the DACx1408 is used in a noisy environment, error checking can be used to check the integrity of SPI data communication between the device and the host processor. This feature is enabled by setting the CRC-EN bit.

The error checking scheme is based on the CRC-8-ATM (HEC) polynomial x8 + x2 + x + 1 (that is, 100000111). When error checking is enabled, the serial interface access cycle width is 32 bits. The normal 24-bit SPI data is appended with an 8-bit CRC polynomial by the host processor before feeding it to the device. In all serial interface readback operations the CRC polynomial is output on the SDO pin as part of the 32-bit cycle.

Table 4. Error Checking Serial Interface Access Cycle

BIT FIELD DESCRIPTION
31 RW Identifies the communication as a read or write command to the address register. R/W = 0 sets a write operation. R/W = 1 sets a read operation.
30 CRC-ERROR Reserved bit. Set to zero.
29-24 A[5:0] Register address. Specifies the register to be accessed during the read or write operation.
23-8 DI[15:0] Data cycle bits. If a write command, the data cycle bits are the values to be written to the register with address A[5:0]. If a read command, the data cycle bits are don't care values.
7-0 CRC 8-bit CRC polynomial.

The DACx1408 decodes the 32-bit access cycle to compute the CRC remainder on CS rising edges. If no error exists, the CRC remainder is zero and data are accepted by the device.

A write operation failing the CRC check causes the data to be ignored by the device. After the write command, a second access cycle can be issued to determine the error checking results (CRC-ERROR bit) on the SDO pin.

If there is a CRC error, the CRC-ALM bit of the status register is set to 1. The ALMOUT pin can be configured to monitor a CRC error by setting the CRCALM-EN bit.

Table 5. Write Operation Error Checking Cycle

BIT FIELD DESCRIPTION
31 RW Echo RW from previous access cycle (RW = 0).
30 CRC-ERROR Returns a 1 when a CRC error is detected, 0 otherwise.
29-24 A[5:0] Echo address from previous access cycle.
23-8 DO[15:0] Echo data from previous access cycle.
7-0 CRC Calculated CRC value of bits 31:8.

A read operation must be followed by a second access cycle to get the requested data on the SDO pin. The error check result (CRC-ERROR bit) from the read command is output on the SDO pin.

As in the case of a write operation failing the CRC check, the CRC-ALM bit of the status register is set to 1 and the ALMOUT pin, if configured for CRC alerts, is set low.

Table 6. Read Operation Error Checking Cycle

BIT FIELD DESCRIPTION
31 RW Echo RW from previous access cycle (RW = 1).
30 CRC-ERROR Returns a 1 when a CRC error is detected, 0 otherwise.
29-24 A[5:0] Echo address from previous access cycle.
23-8 DO[15:0] Echo data from previous access cycle.
7-0 CRC Calculated CRC value of bits 31:8.
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