EVAL-AD7687SDZ

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The EVAL-AD7687SDZ Evaluation Board is a high speed, 12 bit sampling Analog to Digital Converter. This evaluation board is designed to provide an easy and cost effective manner for evaluation and testing of the AD7687 Series for both the design engineer and electro-optic system integrator. The board also provides some sample application programs to quickly get started in evaluating the AD7687\'s performance.

Application Field

The EVAL-AD7687SDZ evaluation board is specifically designed for general-purpose signal-conditioning applications. The board supports a wide range of input signals with its low voltage differential inputs, allowing for direct connection to sensors, transducers, amplifiers, sources, and DACs. Additionally, the board supports an extra differential input, allowing for simultaneous measurement of IEPE/ICP type signals and differential voltage signals at the same time. These features make it ideal for a wide variety of signal-conditioning applications, ranging from instrumentation and data acquisition to test and measurement.

The board is also suitable for use in battery-powered instrumentation and can operate from a single +5 V power supply. It can be powered from either an AC or DC voltage, which makes it versatile for a variety of applications.

Working Principle

The EVAL-AD7687SDZ evaluation board includes two 12-bit Analog to Digital Converters (ADCs), which use a voltage-domain sampling architecture to convert analog signals to digital data. The board utilizes the AD7687, which is an ultra-low power, low noise, simultaneous sampling ADC, with an input range of +/- 2 Volts, a maximum throughput of 400 kSPS, and an industry-leading signal-to-noise ratio (SNR) of 90 dBFS. It is the first ADC to integrate both on-chip noise reduction circuitry and a delayed clock path.

The EVAL-AD7687SDZ evaluation board features two differential inputs and two single-ended inputs, which are routed to the ADCs for simultaneous conversion to digital data. The maximum input signal voltage range is from -2 Volts to +2 Volts and can be adjusted via jumper settings on the board. The analog data is then converted to digital data by the ADC, and the 12-bit digital value is multiplexed to a 32-bit data bus. This digital data is then processed by the FPGA on the board and the results are displayed on the LCD.

The evaluation board has a wide range of features to enable easy evaluation and testing of the ADCs. It has two independent power supplies, allowing for flexible settings to support the various conversion speeds. It also includes a programmable clock for testing at a variety of internal and external sampling rates. In addition, it has two trigger inputs for external test generation and two output pins for external debugging. Finally, it has a USB port for easy debugging, view logic signals, parameter adjustments, and data logging.

Conclusion

The EVAL-AD7687SDZ evaluation board is an ideal solution for evaluating and testing the performance of the AD7687 Series ADCs. It has an industry-leading SNR and is well suited for a wide range of signal-conditioning applications, including instrumentation, data acquisition, and test and measurement. The board features two differential inputs with a wide voltage range, on-board power supplies, a programmable clock, trigger inputs, and a USB port for debugging.

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