ADS7813UB/1K

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Data Acquisition plays an increasingly important role in contemporary instrumentation. One key component of a data acquisition system is an Analog to Digital Converter (ADC), which converts a continuously varying analog voltage waveform into a series of digital numbers for further processing. The ADS7813UB/1K is one example of an Integrated Circuit (IC) designed specifically for this purpose. This article will discuss the application field and working principle of the ADS7813UB/1K.

The ADS7813UB/1K is a monolithic, 8-bit, successive-approximation, analog-to-digital converter (ADC). Its application field is for medium resolution, cost-sensitive data acquisition systems. It typically requires less than 36 μA of supply current and 1.8 μs to convert and transfer a single data sample at 200 ksps. Moreover, it has an internal self-calibrating system that eliminates the need for external zero and full-scale calibration. It is ideal for a variety of data acquisition, control, and instrumentation systems, including in industrial process control, automotive engine control and telemetry, medical instruments, and home appliances.

The ADS7813UB/1K includes the following integrated components: a track/hold amplifier, and 8-bit successive approximation Analog-to-Digital converter, a 6-bit reference divider, and a digital-to-analog converter. It also has an onboard reference amplifier which provides fixed-gain bandwidth control for optimizing the converter\'s operation. Moreover, the device features a serial SPI/QSPI interface to simplify the communication interface between the processor and the system.

The operating principle of the ADS7813UB/1K is based on successive approximation sampling technique. In this technique, a reference voltage is compared a step-by-step with an analog input, and the resolution of the ADC is proportional to the number of steps taken. The successive approximation sampling technique is much faster than the more common Flash conversion technique. First, the incoming analog signal is clamped by a track/hold amplifier, which also provides power supply rejection. Next, the clamped signal is digitized by a successive approximation register (SAR) controlled by the ADC core. The SAR compares the magnitudes of the clamped signal and a reference voltage, selecting one of two binary codes based on the comparison result. The SAR is clocked by an internal oscillator, and the conversion is completed once the SAR has gone through all the steps of the ADC\'s resolution. The result is then fed to a buffer register and output through the SPI/QSPI interface.

In conclusion, the ADS7813UB/1K is a versatile ADC IC designed for medium-resolution, cost-sensitive data acquisition applications. It has an internal self-calibrating system that eliminates the need for external zero and full-scale calibration. Furthermore, it offers an SPI/QSPI output for easy communication with the processor. By employing successive approximation sampling technique, the ADS7813UB/1K offers faster conversion times and greater accuracy than traditional ADC circuits.

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