JAJSNI4 December   2021 DAC11001B

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 Revision History
  5. 5 Pin Configuration and 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: Write, 4.5 V ≤ DVDD ≤ 5.5 V
    7. 6.7  Timing Requirements: Write, 2.7 V ≤ DVDD < 4.5 V
    8. 6.8  Timing Requirements: Read and Daisy-Chain Write, 4.5 V ≤ DVDD ≤ 5.5 V
    9. 6.9  Timing Requirements: Read and Daisy-Chain Write, 2.7 V ≤ DVDD < 4.5 V
    10. 6.10 Timing Diagrams
    11. 6.11 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 Digital-to-Analog Converter Architecture
      2. 7.3.2 External Reference
      3. 7.3.3 Output Buffers
      4. 7.3.4 Internal Power-On Reset (POR)
      5. 7.3.5 Temperature Drift and Calibration
      6. 7.3.6 DAC Output Deglitch Circuit
    4. 7.4 Device Functional Modes
      1. 7.4.1 Fast-Settling Mode and THD
      2. 7.4.2 DAC Update Rate Mode
    5. 7.5 Programming
      1. 7.5.1 Daisy-Chain Operation
      2. 7.5.2 CLR Pin Functionality and Software Clear
      3. 7.5.3 Output Update (Synchronous and Asynchronous)
        1. 7.5.3.1 Synchronous Update
        2. 7.5.3.2 Asynchronous Update
      4. 7.5.4 Software Reset Mode
    6. 7.6 Register Map
      1. 7.6.1 NOP Register (address = 00h) [reset = 0x000000h for bits [23:0]]
      2. 7.6.2 DAC-DATA Register (address = 01h) [reset = 0x000000h for bits [23:0]]
      3. 7.6.3 CONFIG1 Register (address = 02h) [reset = 004C80h for bits [23:0]]
      4. 7.6.4 DAC-CLEAR-DATA Register (address = 03h) [reset = 000000h for bits [23:0]]
      5. 7.6.5 TRIGGER Register (address = 04h) [reset = 000000h for bits [23:0]]
      6. 7.6.6 STATUS Register (address = 05h) [reset = 000000h for bits [23:0]]
      7. 7.6.7 CONFIG2 Register (address = 06h) [reset = 000040h for bits [23:0]]
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Source Measure Unit (SMU)
        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 High-Precision Control Loop
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
      3. 8.2.3 Arbitrary Waveform Generation (AWG)
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Curves
    3. 8.3 System Examples
      1. 8.3.1 Interfacing to a Processor
      2. 8.3.2 Interfacing to a Low-Jitter LDAC Source
      3. 8.3.3 Embedded Resistor Configurations
        1. 8.3.3.1 Minimizing Bias Current Mismatch
        2. 8.3.3.2 2x Gain Configuration
        3. 8.3.3.3 Generating Negative Reference
    4. 8.4 What to Do and What Not to Do
      1. 8.4.1 What to Do
      2. 8.4.2 What Not to Do
    5. 8.5 Initialization Set Up
  9. 9 Power Supply Recommendations
    1. 9.1 Power-Supply Sequencing
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 PCB Assembly Effects on Precision
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 サポート・リソース
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

7.3.5 Temperature Drift and Calibration

The DAC11001B includes a calibration circuit that significantly reduces the temperature drift on integrated and differential nonlinearities. By default, this feature is disabled. Enable the temperature calibration feature by writing 1 to the EN_TMP_CAL bit (address 02h, B23). After the EN_TMP_CAL bit is set, issue a calibration cycle by writing 1 to RCLTMP (address 04h, B8). At this point, the device enters a calibration cycle. Do not issue any DAC update command during this period. The device has the capability to indicate the end of calibration using two methods:

  1. Read the status bit ALM (address 05h, B12) using SPI.
  2. Issue an alarm on the ALARM pin by setting logic 0. To enable this feature, write 1 to ENALMP bit (address 02h, B12).

After the calibration cycle completes, update the DAC code to observe the impact at the DAC output. If the environmental temperature changes after calibration, then recalibrate the device.