ADS7811U/1KG4

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The data acquisition system is a core component in the design of various devices and is used to obtain data from sensors in different environments, such as temperature, pressure, and other related parameters. The data is delivered in analog format, that is, a continuous analog signal, in order to get the digital data, the analog data must be converted into the digital format, so that professional engineers can continue the design next steps. Analog-to-digital converters (ADCs) are used for the conversion of analog signals into the digital ones, and the ADS7811U/1KG4 Analog-to-digital converter is one of the most reliable and cost-effective ADC. This article aims to explain the application field and working principle of the ADS7811U/1KG4.

Application Field of the ADS7811U/1KG4

The ADS7811U/1KG4 is a highly integrated, low power-consuming ACD with an 8-bit resolution, sampling rate and ADC performance. Due to its low power consumption, the ADS7811U/1KG4 is well-suited for applications with limited energy resources, such as portable instruments, diagnosis devices, and measuring systems. The main advantages of having the device integrated into the system is that there is no need for multiple external component such as reference voltage, sample and hold circuit, power amplifier, monolithic digital-to-analog converter (DACs), and others.

In addition, the ADS7811U/1KG4 has an auto-calibration function that ensures its accuracy and correct operation. Wide dynamic range, high sampling rate and low power consumption makes it suitable for applications in telecommunication, automobile systems, and industrial process control. The device also has excellent accuracy and noise performance, which makes it suitable for high-precision equipment.

The ADS7811U/1KG4 also has input charges that can be connected directly to RTD and thermocouple sensors, which are commonly used in temperature monitoring systems. RTDs have the advantage of having a low temperature coefficient and other sensitive components that can be difficult to calibrate. The ADS7811U/1KG4 also supports a wide range of input voltage, which makes it suitable for sensor signals with high dynamic range. The device also supports a wide temperature range, which is important for applications with harsh environmental conditions.

Working Principle of the ADS7811U/1KG4

The ADS7811U/1KG4 uses a successive approximation register (SAR) converter architecture, which is based on the comparator principle and digital switching principle. This device has five components: a digital-to-analog converter (DAC), two reference voltages, an operational amplifier, and a comparator. The DAC is used to generate an analog output voltage that is compared with an analog input signal and/or one of the reference voltages. The result is a digital signal that is compared to the previous output. The process is repeated until an N-bit code (N is equal to the ADC resolution) is generated.

In the ADS7811U/1KG4, the SAR architecture works with an input offset voltage applied to the ADC\'s positive input. This voltage is compared to the given input voltage, and the A/D conversion is accomplished by the following steps:

• The output of the DAC is set to the mid-scale value.
• The output of the DAC is compared to the input voltage.
• If the DAC output is greater than the input voltage, a 0 is generated and the DAC output is decreased.
• If the DAC output is less than the input voltage, a 1 is generated and the DAC output is increased.
• The whole process is repeated until an N-bit code is generated.

The ADS7811U/1KG4 offers the possibility to use external reference voltages, and the range depends on the type of application. Moreover, the device features a built-in reference voltage in case there are no external reference voltages available. The ADS7811U/1KG4 supports up to eight different sampling rates, ranging from 8MHz to 8kHz. The device also supports a wide range of input voltage, from 0V to 5V, which makes it suitable for signals with high dynamic range.

Conclusion

The ADS7811U/1KG4 is an 8-bit low-power analog-to-digital converter (ADC) with an integrated sample-and-hold circuit. The device is suitable for applications with limited energy resources and is suitable for temperature monitoring systems due to its wide dynamic range, high sampling rate and low power consumption. The ADS7811U/1KG4 also features an auto-calibration function, which ensures its accuracy and correct operation. Besides, the ADS7811U/1KG4 uses a successive approximation register (SAR) architecture and supports 8 different sampling rates. This device offers the possibility to use external reference voltages, and supports a wide range of input voltage, from 0V to 5V, which makes it suitable for signals with high dynamic range.

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