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High density, multi-range analog output Versa Module Europa board for control system applications.

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  • 1Inter-University Accelerator Centre, P. O. Box 10502, New Delhi 110067, India.

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A new 64-channel digital-to-analog converter (DAC) module, the VMEDAC64, offers versatile voltage outputs for control systems. Its Field Programmable Gate Array (FPGA) core integrates VMEbus interface and DAC logic, reducing system size and cost.

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Area of Science:

  • * Digital Electronics
  • * Control Systems Engineering
  • * VMEbus Architecture

Background:

  • * Traditional control systems often require numerous modules, increasing complexity, power consumption, and cost.
  • * Integrating digital-to-analog conversion (DAC) and bus interface logic on a single chip presents a design challenge.
  • * The Inter University Accelerator Centre requires advanced, high-density modules for its control systems.

Purpose of the Study:

  • * To develop a high-density, 64-channel digital-to-analog converter (DAC) module for VMEbus systems.
  • * To design a Field Programmable Gate Array (FPGA) based solution integrating DAC control and VMEbus slave interface logic.
  • * To reduce module count, power consumption, and overall system cost in control applications.

Main Methods:

  • * Development of the VMEDAC64, a 12-bit, 64-channel DAC module on a single-width VME module.
  • * Implementation of DAC control logic and VMEbus slave interface logic within a single FPGA.
  • * Design incorporates user-selectable output voltage ranges, programmable refresh rates, and software-controlled output switches.
  • * On-board DC/DC converters provide isolated power for the analog section.

Main Results:

  • * Successful integration of 64 DAC channels and VMEbus interface logic onto a single FPGA.
  • * Achieved high channel density within a standard VME module form factor.
  • * Demonstrated user-selectable output voltage ranges and programmable refresh rates (default 284 Hz).
  • * Modular firmware design facilitated easy debugging and potential for reuse in other VMEbus projects.

Conclusions:

  • * The VMEDAC64 module effectively addresses the need for high-density, cost-effective DAC solutions in VMEbus control systems.
  • * Integrating complex logic onto a single FPGA significantly reduces system size, power consumption, and cost.
  • * The modular design approach enhances flexibility and reduces development time for custom control system modules.