ADS7924EVM-PDK

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Analog-to-Digital Converters (ADCs) are a ubiquitous blue-chip technology, used in diverse applications ranging from low-cost consumer products to high-end medical equipment. In the past, ADC designs were complicated and costly, requiring expensive custom hardware and long development time. However, with the introduction of modern Evaluation Board platforms such as the Texas Instruments ADS7924EVM-PDK, ADC design and implementation has become easier and more cost-effective.

What is the ADS7924EVM-PDK?

The ADS7924EVM-PDK is a general-purpose Evaluation Board designed to evaluate the performance of the Texas Instruments ADS7924 24-bit, low-power, serial peripheral interface (SPI) A/D Converter. It is powered by a 12V power supply, has an operating temperature range of 0°C to +70°C, and operates in the temperature-controlled environment of a development laboratory. The board has two buffered inputs for the analog signal, two buffered outputs for the digital signal, and a 3-position mode switch. It also includs a serial port for communication with a PC or other peripherals.

Applications of the ADS7924EVM-PDK

The ADS7924EVM-PDK is an ideal platform to test and develop high-precision, high-speed ADC designs. The board can be used for a variety of analog signal processing applications, such as medical imaging, communications, automotive, industrial, and test & measurement. With its high speed and dynamic range, the board is well-suited for high-speed float data acquisition, providing improved performance in low-level signal detection applications. The board is also excellent for analog-to-digital conversion applications that require low-power and low-noise, for example, in portable consumer devices.

Working Principles of the ADS7924EVM-PDK

The ADS7924EVM-PDK is based on a 24-bit delta-sigma ADC, which measures the difference between an input voltage and an internal reference voltage. The reference voltage is generated by the board itself, based on user-defined settings. The board converts the analog signal into a corresponding digital signal. The delta-sigma ADC is a multi-stage modulator, with each stage of the modulator having different noise-shaping characteristics. The board also includes a digitally controlled oscillator (DCO) for managing the clock frequency.

The board also includes a specialized circuit for calculating total harmonic distortion (THD) of an input signal. THD is a measurement of how faithfully an analog signal is represented by its digital equivalent. The board uses the THD measurement to provide an indication of a signal\'s fidelity, and can be used to optimize the signal to noise ratio of a digital signal.

The board is also capable of self-calibration, using the self-calibration circuit to adjust the gain of the gain block. The self-calibration circuit is triggered when the board is powered up, and takes less than one second to complete. The resulting calibration data is stored in an EEPROM, allowing the board to automatically shift gain settings when the input voltage changes.

Conclusion

The ADS7924EVM-PDK is a powerful Evaluation Board platform that enables designers to quickly and cost-effectively develop advanced Analog-to-Digital Converter designs. The board provides an easy-to-use platform for signal processing and ADC development, as well as a variety of features for optimizing ADC performance. Its high speed and dynamic range make it ideal for float data acquisition applications, while its low power and noise performance make it well-suited for low-level signal detection applications.

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