EVAL-AD7994EBZ

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The Eval-AD7994EBZ is an evaluation board designed to assess the features and performance of the AD7994 analog to digital converter (ADC). It includes an on-board voltage reference, a temperature sensor, a 12-bit ADC, and other supporting logic circuits.

The AD7994EBZ features an on-board reference voltage with 2.5V and 5V ranges, enabling power-efficient operation with 5V single supply operation and 3V dual supplies. It has an on-board, 12-bit buffered ADC with a maximum of 3.75V differential input range (2.75V single-ended input baseline). The 7-bit digital temperature sensor is an alternative to an off-chip temperature sensor, providing an accurate and low-cost thermal management solution.

The board is ideal for designers looking to evaluate the performance, features, and efficacy of the AD7994 ADC in their application. It can be used in precision data acquisition systems, medical instrumentation, and industrial control systems, among many other applications.

Working Principle

The AD7994EBZ board uses the AD7994 ADC as the core component. The ADC features a differential input, allowing for signal-conditioning flexibility. It provides high-resolution conversion of analog inputs values into digital values, making it suitable for use in precision position control, high-fidelity audio systems, and voltage regulation

The ADC supports two different power supply voltages. The default is 5V, while the other option is 3V. Setting the range to 5V allows the digital output register to accommodate an input voltage between 0V and 5V. At this level, the ADC can provide a resolution of 12-bits with a maximum sampling rate of 147 ksps. In cases where the input signal exceeds 5V, the 3V range can be set in order to provide increased resolution and accuracy.

The ADC uses successive approximation conversion techniques to achieve the digital result, which allows for fast conversion times. The AD7994 provides a 700 kHz conversion rate which allows for higher sampling rates of up to 14.7 MHz in parallel mode (simultaneous sampling of multiple channels).

The board includes an 8-bit SAR ADC as well as a low power, integrated temperature sensor. The SAR ADC is intended to be used to measure the temperatures around the board, including the system temperature. This, in combination with the AD7994 ADC, provides an effective thermal management solution.

In addition to the AD7994 ADC, the AD7994EBZ board also includes a voltage reference, a series of general purpose output ports, status LEDs, an MMCX connector, and on-board power connectors. These components enable the board to be easily connected to external systems and components for easy evaluation of the AD7994 ADC.

Conclusion

The Eval-AD7994EBZ is an effective evaluation board for assessing the features and performance of the AD7994 ADC. It includes an integrated voltage reference, a temperature sensor, an 8-bit SAR ADC, and other supporting components. By providing an accurate, low-cost, and efficient thermal management solution, this board is well-suited for use in precision data acquisition systems, medical instrumentation, and industrial control systems.

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