MIKROE-391

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The Mikroe-391 is an evaluation board providing a Digital to Analog Converter (DAC) with 12-bit-resolution. It is based on the μPR24-A12 DAC from Microchip Technologies Inc.

Purpose and Application

The Mikroe-391 board is designed and manufactured with the intention of providing a comprehensive, easy-to-use platform for evaluation, prototyping, and design of microprocessor-controlled analog systems. It is ideal for areas such as scientific instrumentation, audio amplifiers, power supplies, industrial process control, and more.

The board includes a 2-channel 12-bit DAC with ±2.4V span, a microcontroller with 1MHz resolution, an adjustable voltage reference, and digital I/O capabilities. The board is equipped with on-board programmable logic controllers that allow inputs and outputs to be programmed in real-time. The interactions of the microcontroller, DAC, and digital I/O circuitry enable advanced applications such as amplitude modulation, pulse-width modulation, P2P control, R2R control, and much more.

Configuring and Operating the Board

The Mikroe-391 board is designed with I2C and SPI connectivity, making it easy to communicate with and configure the board. The I2C bus allows for fast data transfers and supports both master-slave and multi-master configuration. The SPI bus enables fast and reliable communication with external peripherals.

The Mikroe-391 board is equipped with programmable logic, which can be used to quickly prototype complex analogue systems. With the correct configuration, this board can produce arbitrary waveforms, PID controllers, and multi-stage control systems.

The board can be connected directly to a computer via the USB interface to allow for quick and easy data logging. Software programs can be written and debugged with the included Integrated Development Environment (IDE).

Board Features

The Mikroe-391 board features the following components:

• Microchip μPR 24-A12 DAC
• Microchip PIC16F1933 microcontroller
• Programmable logic
• 16-bit analog multiplexer
• Analog voltage reference
• Digital I/O
• USB for PC connectivity

Working Principle

The Mikroe-391 board works on the principle of binary-weighted digital-to-analog conversion. The digital signal is divided into two parts, the MSB (most significant bit) and the LSB (least significant bit). The MSB is multiplied by the largest digital weight, and the LSB is multiplied by the smallest digital weight. The weighted analog voltage is then output from the DAC.

The board has on-board programmable logic that allows for real-time control of the DAC output. This allows for applications such as amplitude modulation, pulse-width modulation, and R2R control. The microcontroller and I/O circuitry can also be used to create complex multi-stage control systems.

Conclusion

The Mikroe-391 is a versatile and easy-to-use evaluation board with features that help engineers quickly prototype and evaluate analog systems. With its various components and 12-bit resolution, this board gives analog design engineers plenty of flexibility for their projects.

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