SLASEL0B October   2019  – June 2020 DAC11001A , DAC81001 , DAC91001

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Functional Block Diagram
      2.      High-Precision, Control-Loop Circuit
  4. 4 Revision History
  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 Package
    5. 7.5      Electrical Characteristics
    6. Table 1. Timing Requirements: Write, 4.5 V ≤ DVDD ≤ 5.5 V
    7. Table 2. Timing Requirements: Write, 2.7 V ≤ DVDD < 4.5 V
    8. Table 3. Timing Requirements: Read and Daisy-Chain Write, 4.5 V ≤ DVDD ≤ 5.5 V
    9. Table 4. Timing Requirements: Read and Daisy-Chain Write, 2.7 V ≤ DVDD < 4.5 V
    10. 7.6      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 Digital-to-Analog Converter Architecture
      2. 8.3.2 External Reference
      3. 8.3.3 Output Buffers
      4. 8.3.4 Internal Power-On Reset (POR)
      5. 8.3.5 Temperature Drift and Calibration
      6. 8.3.6 DAC Output Deglitch Circuit
    4. 8.4 Device Functional Modes
      1. 8.4.1 Fast-Settling Mode and THD
      2. 8.4.2 DAC Update Rate Mode
    5. 8.5 Programming
      1. 8.5.1 Daisy-Chain Operation
      2. 8.5.2 CLR Pin Functionality and Software Clear
      3. 8.5.3 Output Update (Synchronous and Asynchronous)
        1. 8.5.3.1 Synchronous Update
        2. 8.5.3.2 Asynchronous Update
      4. 8.5.4 Software Reset Mode
    6. 8.6 Register Map
      1. 8.6.1 NOP Register (address = 00h) [reset = 0x000000h]
        1. Table 9. NOP Register Field Descriptions
      2. 8.6.2 DAC-DATA Register (address = 01h) [reset = 0x000000h]
        1. Table 10. DAC-DATA Register Field Descriptions
      3. 8.6.3 CONFIG1 Register (address = 02h) [reset = 004C80h for bits [23:0]]
        1. Table 11. CONFIG1 Register Field Descriptions
      4. 8.6.4 DAC-CLEAR-DATA Register (address = 03h) [reset = 000000h for bits [23:0]]
        1. Table 12. DAC-CLEAR-DATA Register Field Descriptions
      5. 8.6.5 TRIGGER Register (address = 04h) [reset = 000000h for bits [23:0]]
        1. Table 13. TRIGGER Register Field Descriptions
      6. 8.6.6 STATUS Register (address = 05h) [reset = 000000h for bits [23:0]]
        1. Table 14. STATUS Register Field Descriptions
      7. 8.6.7 CONFIG2 Register (address = 06h) [reset = 000040h for bits [23:0]]
        1. Table 15. CONFIG2 Register Field Descriptions
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Source Measure Unit (SMU)
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Battery Test Equipment (BTE)
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
      3. 9.2.3 High-Precision Control Loop
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
        3. 9.2.3.3 Application Curves
      4. 9.2.4 Arbitrary Waveform Generation (AWG)
        1. 9.2.4.1 Design Requirements
        2. 9.2.4.2 Detailed Design Procedure
        3. 9.2.4.3 Application Curves
    3. 9.3 System Examples
      1. 9.3.1 Interfacing to a Processor
      2. 9.3.2 Interfacing to a Low-Jitter LDAC Source
      3. 9.3.3 Embedded Resistor Configurations
        1. 9.3.3.1 Minimizing Bias Current Mismatch
        2. 9.3.3.2 2x Gain configuration
        3. 9.3.3.3 Generating Negative Reference
    4. 9.4 What to Do and What Not to Do
      1. 9.4.1 What to Do
      2. 9.4.2 What Not to Do
    5. 9.5 Initialization Set Up
  10. 10Power Supply Recommendations
    1. 10.1 Power-Supply Sequencing
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Related Links
    4. 12.4 Receiving Notification of Documentation Updates
    5. 12.5 Support Resources
    6. 12.6 Trademarks
    7. 12.7 Electrostatic Discharge Caution
    8. 12.8 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

8.5 Programming

The DACx1001 family of devices is controlled through a flexible four-wire serial interface that is compatible with serial interfaces used on many microcontrollers and DSP controllers. The interface provides read and write access to all registers of the DACx1001 devices. Additionally, the interface can be configured to daisy-chain multiple devices for write operations.

Each serial interface access cycle is exactly 32 bits long, as shown in Figure 46. A frame is initiated by asserting SYNC pin low. The frame ends when the SYNC pin is deasserted high. The first bit is read/write bit B31. A write is performed when this bit is set to 0, and a read is performed when this bit is set to 1. The next 7 bits are address bits B30 to B24. The next 20 bits are data. For all writes, data are clocked on the falling edge of SCLK. As Figure 47 shows, for read access and daisy-chain operation, the data are clocked out on the SDO terminal on the rising edge of SCLK.

DAC11001A DAC91001 DAC81001 SLASEL0_SPI_WR_Cycle.gifFigure 46. Serial Interface Write Bus Cycle: Standalone Mode
DAC11001A DAC91001 DAC81001 SLASEL0_SPI_RB_Cycle.gifFigure 47. Serial Interface Read Bus Cycle