SBAS528D June   2013  – December 2021 DAC7760 , DAC8760

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and 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  Electrical Characteristics: AC
    7. 7.7  Timing Requirements: Write Mode
    8. 7.8  Timing Requirements: Readback Mode
    9. 7.9  Timing Diagrams
    10. 7.10 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  DAC Architecture
      2. 8.3.2  Voltage Output Stage
      3. 8.3.3  Current Output Stage
      4. 8.3.4  Internal Reference
      5. 8.3.5  Digital Power Supply
      6. 8.3.6  DAC Clear
      7. 8.3.7  Power-On Reset
      8. 8.3.8  Alarm Detection
      9. 8.3.9  Watchdog Timer
      10. 8.3.10 Frame Error Checking
      11. 8.3.11 User Calibration
      12. 8.3.12 Programmable Slew Rate
    4. 8.4 Device Functional Modes
      1. 8.4.1 Setting Voltage and Current Output Ranges
      2. 8.4.2 Boost Configuration for IOUT
      3. 8.4.3 Filtering the Current Output (only on the VQFN package)
      4. 8.4.4 HART Interface
        1. 8.4.4.1 For 4-mA to 20-mA Mode
        2. 8.4.4.2 For All Current Output Modes
    5. 8.5 Programming
      1. 8.5.1 Serial Peripheral Interface (SPI)
        1. 8.5.1.1 SPI Shift Register
        2. 8.5.1.2 Write Operation
        3. 8.5.1.3 Read Operation
        4. 8.5.1.4 Stand-Alone Operation
        5. 8.5.1.5 Multiple Devices on the Bus
    6. 8.6 Register Maps
      1. 8.6.1 DACx760 Command and Register Map
        1. 8.6.1.1 DACx760 Register Descriptions
          1. 8.6.1.1.1 Control Register
          2. 8.6.1.1.2 Configuration Register
          3. 8.6.1.1.3 DAC Registers
          4. 8.6.1.1.4 Reset Register
          5. 8.6.1.1.5 Status Register
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Controlling the VOUT and IOUT Pins
        1. 9.1.1.1 VOUT and IOUT Pins are Independent Outputs, Never Simultaneously Enabled
        2. 9.1.1.2 VOUT and IOUT Pins are Independent Outputs, Simultaneously Enabled
        3. 9.1.1.3 VOUT and IOUT Pins are Tied Together, Never Simultaneously Enabled
      2. 9.1.2 Implementing HART in All Current Output Modes
        1. 9.1.2.1 Using CAP2 Pin on VQFN Package
        2. 9.1.2.2 Using the ISET-R Pin
      3. 9.1.3 Short-Circuit Current Limiting
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Thermal Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
8.6.1.1.2 Configuration Register

The DACx760 configuration register is written to at address 0x57. Table 8-18 summarizes the description for the configuration register bits.

Table 8-18 Configuration Register 0x57
DATA BIT(S) NAME DEFAULT DESCRIPTION
DB15:DB11 0h Reserved. User must not write any value other than zero to these bits.
DB10:DB9 IOUT RANGE 00 IOUT range. These bits are only used if both voltage and current outputs are simultaneously enabled through bit 8 (DUAL OUTEN). The voltage output range is still controlled by bits 2:0 of the Control Register (RANGE bits). The current range is controlled by these bits and has similar behavior to RANGE[1:0] when RANGE[2] = 1. However, unlike the RANGE bits, a change to this field does not make the DAC data register go to its default value.
DB8 DUAL OUTEN 0 DAC dual output enable. This bit controls if the voltage and current outputs are enabled simultaneously. Both are enabled when this bit is high. However, both outputs are controlled by the same DAC data register.
DB7 APD 0 Alternate power down. On power-up, +VSENSE is connected to the internal VOUT amplifier inverting pin. Diodes exist at this node to REFIN and GND. Setting this bit connects this node to ground through a resistor. When set, the equivalent resistance seen from +VSENSE to GND is 70 kΩ. This is useful in applications where the VOUT and IOUT pins are tied together.
DB6 0 Reserved. Do not write any value other than zero to these bits.
DB5 CALEN 0 User calibration enable. When user calibration is enabled, the DAC data are adjusted according to the contents of the gain and zero calibration registers. See Section 8.3.11.
DB4 HARTEN 0 Enable interface through HART-IN pin (only valid for IOUT set to 4-mA to 20-mA range through RANGE bits).
Bit = 1: HART signal is connected through internal resistor and modulates output current.
Bit = 0: HART interface is disabled.
DB3 CRCEN 0 Enable frame error checking.
DB2 WDEN 0 Watchdog timer enable.
DB1:DB0 WDPD[1:0] 00 Watchdog timeout period.