DAC38RF89EVM

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The DAC38RF89EVM evaluation board (eval board) from Texas Instruments is used for testing and evaluating digital-to-analog conversion (DAC) applications. This eval board is equipped with TI\'s highest-performance DAC with integrated temperature sensor, the DAC38RF89. This board can be used to evaluate the performance and characterizations of digital-to-analog conversion applications for a variety of industrial, automotive, consumer, and medical areas of application.

Application Field

The DAC38RF89EVM comes equipped with support components, including a 2.5V LDO regulator with low-noise TPS7A50 voltage reference, PC-mountable JEDEC memory, and configurable I2C address. The DAC38RF89EVM is designed to support precision digital-to-analog conversion applications from output voltages of 0.1V to 3.3V, with output voltage accuracy as low as 0.1% max. The DAC38RF89EVM can accommodate various industrial, automotive, consumer, and medical areas of application, such as automotive navigation systems, motor control, lighting control, home appliances, consumer audio, mobile handsets, medical instrumentation, and battery charging.

Working Principle

In order to achieve digital-to-analog conversion, DAC38RF89EVM uses the following principle: a high resolution sigma-delta modulator that is based on a proprietary, time-based architecture. The modulator consists of two parts: the analog part and the digital part. The analog part includes a resistor transfer element, which is the integral part of the modulator, and is responsible for the output current magnitude. It also includes comparators and voltage references, which provide the nonlinear characteristics necessary for a DAC. The digital part operates in two modes: idle mode and conversion mode. In idle mode, the digital circuitry is placed into a low power state. In conversion mode, the digital circuitry is enabled and the digital data stream is converted into current, as determined by the reference resistor. The output current is accurately tracked and programmed over a wide range of light loads and temperature conditions.

Conclusion

The DAC38RF89EVM digital-to-analog converter evaluation board from Texas Instruments provides a comprehensive solution for testing and evaluating digital-to-analog conversion applications. The DAC38RF89EVM is specifically designed to support precision applications with an output voltage accuracy of 0.1% max, and can be used in a variety of industrial, automotive, consumer, and medical applications. The board works using time-based sigma-delta modulator architecture, in which an analog part and a digital part cooperate to accurately control and track the output current at all times and over a wide range of temperature conditions.

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