PCM1718E

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Data Acquisition can be defined as the process of sampling signals that measure real world physical conditions and converting the resulting samples into digital numeric values that can be manipulated by a computer. ADCs (Analog-to-Digital Converters) and DACs (Digital-to-Analog Converters) are components used in data acquisition. Special Purpose, which includes PCM1718E, is a type of ADCs/DACs. PCM1718E is an 18-bit sigma-delta, high-performance analog-to-digital converter. It operates up to 200ksps and can be used in auxiliary and multi-channel applications. This article explains the application field and working principle of PCM1718E.

The application field of PCM1718E mainly includes Multi-Channel Audio ADCs, High-End Cardio and Neurological Monitoring, Portable Medical Instrumentation, Automotive and Industrial Automation, and Positioning/Motion Control. All of these applications require highly accurate and reliable data acquisition that is also immune to electrical interference. The PCM1718E has several features that make it suitable for such applications. It has a lower noise floor and wider dynamic range than other similar components, offering superior performance in both analog-to-digital and digital-to-analog conversions. Additionally, it is capable of operating at a very low power consumption, making it ideal for use in portable or battery-powered applications. Furthermore, the PCM1718E features an integrated temperature sensing technology, allowing it to accurately monitor and compensate for external temperature variances.

The working principle of PCM1718E relies on Sigma-Delta Modulation. Sigma-Delta Modulation is a digital signal processing technique used to reduce noise and achieve high resolution. In this technique, the analog signal is sampled, then converted into a digital output by comparing the sample data against a reference voltage. The sample rate is selected so that each of the digital outputs represents a paper scale resolution of 0.1 to 1LSBs (Least Significant Bits). By using Sigma-Delta Modulation, it is possible to achieve a high level of resolution while maintaining low distortion levels. The PCM1718E incorporates several internal digital-to-analog and analog-to-digital filters to reject out-of-band noise and provide a clean signal.

The PCM1718E also features an integrated temperature sensing technology. This allows it to monitor and compensate for external temperature variances. The PCM1718E has a temperature range from -40°C to +125°C, and works by using a band gap reference voltage to monitor the ambient temperature. It then automatically adjusts internal filters to correct for any temperature shifts. This ensures that the performance of the device remains consistent and accurate, regardless of the external temperature. Additionally, the device is capable of monitoring up to three different temperature points, allowing users to fine-tune the accuracy of their measurements.

In conclusion, PCM1718E is a 18-bit sigma-delta, high-performance analog-to-digital converter. It is suitable for a variety of applications, from multi-channel audio to position/motion control. It features a low noise floor and wide dynamic range, in addition to its temperature sensing technology. The PCM1718E uses Sigma-Delta Modulation to convert analog signal into digital signals, and its internal digital-to-analog and analog-to-digital filters reject out-of-band noise for a clean signal. With its low power consumption, wide temperature range, and high performance, the PCM1718E is a valuable component for anyone engaged in data acquisition.

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