SLAS535F September   2007  – October 2018 DAC5652A

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
    1.     Functional Block Diagram
  3. 3 Description
  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: DC
    6. 6.6  Electrical Characteristics: AC
    7. 6.7  Electrical Characteristics: Digital Input
    8. 6.8  Electrical Characteristics: Power Supply
    9. 6.9  Switching Characteristics
    10. 6.10 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Digital Inputs
      2. 7.3.2 References
        1. 7.3.2.1 Internal Reference
        2. 7.3.2.2 External Reference
    4. 7.4 Device Functional Modes
      1. 7.4.1 Input Interfaces
        1. 7.4.1.1 Dual-Bus Data Interface and Timing
        2. 7.4.1.2 Single-Bus Interleaved Data Interface and Timing
      2. 7.4.2 Gain Setting Option
      3. 7.4.3 Sleep Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 DAC Transfer Function
        1. 8.1.1.1 Analog Outputs
      2. 8.1.2 Output Configurations
      3. 8.1.3 Differential With Transformer
      4. 8.1.4 Single-Ended Configuration
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
  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 Resources
    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

7.1 Overview

The architecture of the DAC5652A uses a current steering technique to enable fast switching and a high update rate. The core element within the monolithic DAC is an array of segmented current sources that are designed to deliver a full-scale output current of up to 20 mA. An internal decoder addresses the differential current switches each time the DAC is updated, and a corresponding output current is formed by steering all currents to either output summing node, IOUT1 or IOUT2. The complementary outputs deliver a differential output signal, which improves the dynamic performance through reduction of even-order harmonics, common-mode signals (noise), and doubles the peak-to-peak output signal swing by a factor of two, as compared to single-ended operation.

The segmented architecture results in a significant reduction of the glitch energy and improves the dynamic performance (SFDR) and DNL. The current outputs maintain a very high output impedance of greater
than 300 kΩ.

When pin 42 (GSET) is high (simultaneous gain set mode), the full-scale output current for DACs is determined by the ratio of the internal reference voltage (1.2 V) and an external resistor (RSET) connected to BIASJ_A. When GSET is low (independent gain set mode), the full-scale output current for each DAC is determined by the ratio of the internal reference voltage (1.2 V) and separate external resistors (RSET) connected to BIASJ_A and BIASJ_B. The resulting IREF is internally multiplied by a factor of 32 to produce an effective DAC output current that can range from 2 mA to 20 mA, depending on the value of RSET.

The DAC5652A is split into a digital and an analog portion, each of which is powered through its own supply pin. The digital section includes edge-triggered input latches and the decoder logic, while the analog section comprises both the current source array with its associated switches, and the reference circuitry.