SBAS442D august   2008  – august 2023 DAC5311 , DAC6311 , DAC7311

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison
  7. 6 Pin Configuration and Functions
  8. 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  Timing Diagrams
    8. 7.8  Typical Characteristics: AVDD = 5 V
    9. 7.9  Typical Characteristics: AVDD = 3.6 V
    10. 7.10 Typical Characteristics: AVDD = 2.7 V
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 DAC Section
      2. 8.3.2 Resistor String
      3. 8.3.3 Output Amplifier
      4. 8.3.4 Power-On Reset
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Down Modes
    5. 8.5 Programming
      1. 8.5.1 Serial Interface
        1. 8.5.1.1 Input Shift Register
        2. 8.5.1.2 SYNC Interrupt
  10. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Microprocessor Interfacing
        1. 9.1.1.1 DACx311 to 8051 Interface
        2. 9.1.1.2 DACx311 to Microwire Interface
        3. 9.1.1.3 DACx311 to 68HC11 Interface
    2. 9.2 Typical Applications
      1. 9.2.1 Loop Powered Transmitter
        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 Using the REF5050 as a Power Supply for the DACx311
      3. 9.2.3 Bipolar Operation Using the DACx311
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  12. 11Mechanical, Packaging, and Orderable Information

9.2.3 Bipolar Operation Using the DACx311

The DACx311 has been designed for single-supply operation but a bipolar output range is also possible using the circuit in Figure 9-9. The circuit shown gives an output voltage range of ±5 V. Rail-to-rail operation at the amplifier output is achievable using an OPA211, OPA340, or OPA703 as the output amplifier. For a full list of available operational amplifiers from TI, see the TI web site at www.ti.com

The output voltage for any input code can be calculated as follows:

Equation 7. GUID-572F0B05-E7BD-45D6-BDBC-81465EAEBE86-low.gif

where

  • n = resolution in bits; either 8 (DAC5311), 10 (DAC6311), or 12 (DAC7311).
  • D = decimal equivalent of the binary code that is loaded to the DAC register. D ranges from 0 to 255 for 8-bit DAC5311, 0 to 1023 for the 10-bit DAC6311 and 0 to 4095 for the 12-bit DAC7311.

With AVDD = 5 V, R1 = R2 = 10 kΩ:

Equation 8. GUID-3CA288BD-9AFC-4B3F-9B1B-15E5C521C44D-low.gif

The resulting output voltage range is ±5 V. Code 000h corresponds to a –5-V output and FFFh (12-bit level) corresponding to a +5-V output.

GUID-AB64D3BF-61E9-473E-8C91-BB0578001211-low.gif Figure 9-9 Bipolar Operation With the DACx311