ADS820U

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Analog to Digital Converters, or ADCs, are an important part of any data acquisition system. The ADS820U, a precision 12-bit low-power low-noise high-speed multi-channel ADC, is a perfect example of an ADC designed for use in high-precision industrial, medical and automotive applications. This article will cover the applications of the ADS820U, as well as the working principles behind its operation.

ADS820U Application Field

The ADS820U is a high-precision low-power low-noise multi-channel ADC, providing 12-bit resolution over a wide input range of 40mV to 4V. With a maximum sample rate of up to 800 kSPS and a low current consumption of up to 42µA/ch, the ADS820U is an ideal choice for many industrial, medical, and automotive applications such as motor control and monitoring, closed-loop motor control, measurement of AC current and voltage, medical applications such as patient monitoring and portable medical devices, and automotive applications such as engine control and monitoring, pre-charge control, and system power management. Its small size and low power consumption also make it well suited for use in embedded systems with limited space and power resources.

Working Principle

The ADS820U is designed for two-step conversion of analog signals to digital values. The first step is the sample and hold circuit, which acquires the analog input signal and stores it for comparator conversion. The sample and hold circuit consists of an op amp and two capacitor networks. When the input analog voltage is sampled, the input voltages are compared with a 5V reference. The output from this step is a digital code, which is sent to the next step of conversion. The second step is the analog-to-digital conversion, which is done by the internal 12-bit ADC converter by comparing the input analog voltage to a set of resistance networks. The output of this step is the final digital code which can be outputted on the SPI or I²C port.

Conclusion

The ADS820U is an ideal choice for industrial, medical and automotive applications, providing a high-precision low-power low-noise solution for data acquisition. Its working principle of sample and hold converters followed by 12-bit analog-to-digital conversion makes it highly accurate and reliable for use in these demanding applications. With its small size and lower power consumption, the ADS820U is ideal for embedded systems with limited space and power resources.

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