SLASER3A July   2018  – November 2018 DAC61408 , DAC71408 , DAC81408

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Functional Block Diagram
  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
    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. 13Device and Documentation Support
    1. 13.1 Documentation Support
    2. 13.2 Related Links
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Community Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RHA|40
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.4.1 Toggle Mode

Each DAC in the device can be independently configured to operate in toggle mode. A DAC channel in toggle mode incorporates two DAC registers (Register A and Register B) and can be set to switch repetitively between these two values. The DACx1408 toggle mode operation can be configured to introduce a dither signal to the DAC output, to generate a periodic signal or to implement ON/OFF signaling, among some examples.

To update the toggle registers the following sequence should be followed:

  1. Set DAC channel in synchronous mode and disable toggle mode for that channel
  2. Write the desired Register A value to the DAC data register
  3. Issue a DAC trigger signal to load Register A
  4. Write the desired Register B value to the DAC data register
  5. Enable toggle mode to load Register B

Once both registers are loaded with data, any of the three TOGGLE[2:0] pins can be used to switch those DACs configured for toggle operation back and forth between the contents of their two DAC specific registers by using an external clock or logic signal. A TOGGLE pin logic low updates the DAC output to the value set by Register A. A logic high updates the DAC output to the value set by Register B. The three TOGGLE[2:0] pins give the DACx1408 the option to operate with up to three toggle rates.

Additionally, the device can be configured for software controlled toggle operation by setting the SOFTTOGGLE-EN bit. In this mode, any of the three AB-TOG[2:0] bits can be used as a toggle control signal. Setting the ABTOG bit to 1 enables Register B and clearing it to 0 enables Register A.