ZHCSLO2E October   2020  – January 2021 DAC5652

PRODUCTION DATA  

  1. 特性
  2. 应用
  3. 说明
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1  Absolute Maximum Rationgs
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Resistance Characteristics
    5. 6.5  Electrical Characteristics
    6. 6.6  Electrical Characteristics
    7. 6.7  Electrical Characteristics, AC
    8. 6.8  Electrical Characteristics, DC
    9. 6.9  Switching Characteristics
    10. 6.10 Typical Characteristics
  7. Parameter Measurement Information
    1. 7.1 Digital Inputs and Timing
      1. 7.1.1 Digital Inputs
      2. 7.1.2 Input Interfaces
      3. 7.1.3 Dual-Bus Data Interface and Timing
      4. 7.1.4 Single-Bus Interleaved Data Interface and Timing
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 DAC Transfer Function
      2. 8.3.2 Analog Outputs
      3. 8.3.3 Output Configurations
      4. 8.3.4 Differential With Transformer
      5. 8.3.5 Single-Ended Configuration
      6. 8.3.6 Reference Operation
        1. 8.3.6.1 Internal Reference
        2. 8.3.6.2 External Reference
      7. 8.3.7 Gain Setting Option
    4. 8.4 Device Functional Modes
      1. 8.4.1 Sleep Mode
  9. Application Information Disclaimer
    1. 9.1 Application Informmation
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Performance Plots
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    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 静电放电警告
    6. 12.6 术语表
  13. 13Mechanical, Packaging, and Orderable Information

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Analog Outputs

The DAC5652 provides two complementary current outputs, IOUT1 and IOUT2. The simplified circuit of the analog output stage representing the differential topology is shown in Figure 8-1. The output impedance of IOUT1 and IOUT2 results from the parallel combination of the differential switches, along with the current sources and associated parasitic capacitances.

GUID-1332E4AB-0CFF-43C9-AE69-E5F715C0A307-low.gif Figure 8-1 Analog Outputs

The signal voltage swing that may develop at the two outputs, IOUT1 and IOUT2, is limited by a negative and positive compliance. The negative limit of –1 V is given by the breakdown voltage of the CMOS process and exceeding it compromises the reliability of the DAC5652 (or even causes permanent damage). With the full-scale output set to 20 mA, the positive compliance equals 1.2 V. Note that the compliance range decreases to about
1 V for a selected output current of IOUTFS = 2 mA. Care must be taken that the configuration of DAC5652 does not exceed the compliance range to avoid degradation of the distortion performance and integral linearity.

Best distortion performance is typically achieved with the maximum full-scale output signal limited to approximately 0.5 VPP. This is the case for a 50-Ω doubly-terminated load and a 20-mA full-scale output current. A variety of loads can be adapted to the output of the DAC5652 by selecting a suitable transformer while maintaining optimum voltage levels at IOUT1 and IOUT2. Furthermore, using the differential output configuration in combination with a transformer is instrumental for achieving excellent distortion performance. Common-mode errors, such as even-order harmonics or noise, can be substantially reduced. This is particularly the case with high output frequencies.

For those applications requiring the optimum distortion and noise performance, it is recommended to select a full-scale output of 20 mA. A lower full-scale range of 2 mA may be considered for applications that require low power consumption, but can tolerate a slight reduction in performance level.