ZHCSBX4D June   2013  – December 2021 DAC7760 , DAC8760

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  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 接收文档更新通知
    3. 12.3 支持资源
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 术语表
  13. 13Mechanical, Packaging, and Orderable Information

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8.4.1 Setting Voltage and Current Output Ranges

For voltage and current outputs in normal mode (VOUT and IOUT are not simultaneously enabled), the output range is set according to Table 8-7.

Table 8-7 RANGE Bits vs Output Range
RANGEOUTPUT RANGE
0000 V to +5 V
0010 V to +10 V
010±5 V
011±10 V
100Not allowed(1)
1014 mA to 20 mA
1100 mA to 20 mA
1110 mA to 24 mA
(1) RANGE bits cannot be programmed to 0x100. Previous value is held when this command is written.

Note that changing the RANGE bits at any time causes the DAC data register to be cleared based on the value of CLR-SEL (pin or register bit) and the new value of the RANGE bits.

In addition to the RANGE bits, the OVR bit extends the voltage output range by 10%. if the OVR bit is set, the voltage output range follows Table 8-8, as long as there is headroom with the supply.

Table 8-8 Voltage Output Overrange
VOLTAGE OUTPUT RANGEVOLTAGE OUTPUT OVERRANGE
0 V to 5 V0 V to 5.5 V
0 V to 10 V0 V to +11 V
±5 V±5.5 V
±10 V±11 V

When VOUT and IOUT are simultaneously enabled (dual-output mode) by setting DUAL OUTEN in the Configuration Register, the voltage output is controlled by RANGE in the Control Register (see Table 8-9), and the current output is controlled by IOUT RANGE in the Configuration Register (see Table 8-10).

Table 8-9 RANGE Bits vs Voltage Output Range in Dual-Output Mode
RANGEOUTPUT RANGE
0000 V to +5 V
0010 V to +10 V
010±5 V
011±10 V
100Not allowed(1)
1xxDisabled
(1) RANGE bits cannot be programmed to 0x100. Previous value is held when this command is written.
Table 8-10 IOUT RANGE Bits vs Current Output Range in Dual-Output Mode
RANGEOUTPUT RANGE
00Disabled
014 mA to 20 mA
100 mA to 20 mA
110 mA to 24 mA