SLAS464C December   2006  – January 2018 DAC8560

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Functional Block Diagram
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics
    6. 6.6  Timing Requirements
    7. 6.7  Typical Characteristics: Internal Reference
    8. 6.8  Typical Characteristics: DAC at VDD = 5 V
    9. 6.9  Typical Characteristics: DAC at VDD = 3.6 V
    10. 6.10 Typical Characteristics: DAC at VDD = 2.7 V
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Digital-to-Analog Converter (DAC)
      2. 7.3.2 Resistor String
      3. 7.3.3 Output Amplifier
      4. 7.3.4 DAC Noise Performance
      5. 7.3.5 Internal Reference
        1. 7.3.5.1 Enable/Disable Internal Reference
        2. 7.3.5.2 Internal Reference Load
          1. 7.3.5.2.1 Supply Voltage
          2. 7.3.5.2.2 Temperature Drift
          3. 7.3.5.2.3 Noise Performance
          4. 7.3.5.2.4 Load Regulation
          5. 7.3.5.2.5 Long-Term Stability
          6. 7.3.5.2.6 Thermal Hysteresis
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power-Down Modes
    5. 7.5 Programming
      1. 7.5.1 Serial Interface
      2. 7.5.2 Input Shift Register
      3. 7.5.3 SYNC Interrupt
      4. 7.5.4 Power-On Reset
    6. 7.6 Register Maps
      1. 7.6.1 Write Sequence for Disabling the DAC8560 Internal Reference
        1. Table 1. Write Sequence for Disabling the DAC8560 Internal Reference
      2. 7.6.2 Enabling the DAC8560 Internal Reference (Write Sequence 1 of 2)
        1. Table 2. Enabling the DAC8560 Internal Reference (Write Sequence 1 of 2)
      3. 7.6.3 Enabling the DAC8560 Internal Reference (Write Sequence 2 of 2)
        1. Table 3. Enabling the DAC8560 Internal Reference (Write Sequence 2 of 2)
      4. 7.6.4 DAC8560 Data Input Register Format
        1. Table 4. DAC8560 Data Input Register Format
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure or Bipolar Operation > ±VREF
        1. 8.2.2.1 Bipolar Operation Greater Than ±VREF
          1. 8.2.2.1.1 Passive Component Selection
          2. 8.2.2.1.2 Amplifier Selection
        2. 8.2.2.2 Microprocessor Interfacing
          1. 8.2.2.2.1 DAC8560 to 8051 Interface
          2. 8.2.2.2.2 DAC8560 to Microwire Interface
          3. 8.2.2.2.3 DAC8560 to 68HC11 Interface
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resource
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

10.1 Layout Guidelines

A precision analog component requires careful layout, adequate bypassing, and clean, well-regulated power supplies.

The DAC8560 offers single-supply operation, and it often is used in close proximity with digital logic, microcontrollers, microprocessors, and digital signal processors. The more digital logic present in the design and the higher the switching speed, the more difficult it is to keep digital noise from appearing at the output.

As a result of the single ground pin of the DAC8560, all return currents, including digital and analog return currents for the DAC, must flow through a single point. Ideally, connect GND directly to an analog ground plane. This plane would be separate from the ground connection for the digital components until they were connected at the power-entry point of the system.

The power applied to VDD must be well regulated and low noise. Switching power supplies and DC-DC converters often have high-frequency glitches or spikes riding on the output voltage. In addition, digital components can create similar high-frequency spikes as their internal logic switches states. This noise can easily couple into the DAC output voltage through various paths between the power connections and analog output.

As with the GND connection, connect VDD to a power-supply plane or trace that is separate from the connection for digital logic until they are connected at the power-entry point. In addition, a 1-μF to 10-μF capacitor and 0.1-μF bypass capacitor are strongly recommended. In some situations, additional bypassing may be required, such as a 100-μF electrolytic capacitor or even a Pi filter made up of inductors and capacitors – all designed to essentially low-pass filter the supply, removing the high-frequency noise.