AD7998BRU-0

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Data acquisition and analog to digital converters are important components of every electronics project. Many applications that require conversion from analog to digital require a ADC. One of the popular ADC solutions currently is the AD7998BRU-0. In this article, we’ll discuss the application field and working principle of the AD7998BRU-0.

The AD7998BRU-0 is an integrated circuit from Analog Devices. This chip proffers 8-bit resolution which is appropriate for low to moderate resolution measurements. It offers a variable gain amplifier for an input voltage range of 4.096V, as it supports ratiometric, fixed reference, and bipolar input ranges. Other features of the AD7998BRU-0 include settling time of 10 μs, sampling rate of 1 MHz, and voltage references of 2.5V and 5V.

The ADC itself contains 6 major components consisting of the reference voltage circuit, the negative voltage generator circuit, the internal clock generator, the Sample and Hold circuit, the Delta Sigma modulator, and the digital filter. The overall architecture of the AD7998BRU-0 is the filter modulation architecture, where signals entering the modulator is first filtered before passing through the modulator. This ensures that noise is filtered out before entering the modulator.

Due to its ratiometric input and 0V to 4.096V voltage range, the AD7998BRU-0 is suitable for many applications, especially in measurement of analog signals. It is commonly used in medical equipment, communications systems, industrial systems and process control for measuring temperature, pressure, flow, voltage, current and chemical composition.

For the working principle, the AD7998BRU-0 uses differential preprocessing, which minimizes second order errors, crosstalk and input contributed noise. The analog voltage is then fed to the sample and hold circuit, where the circuit holds the data while the conversion is taking place. After that, it will pass through the Delta Sigma modulator. The modulator then processes the data in form of a pulse width modulation (PWM). This digital data is then filtered using a digital filter and sent to the output for digital processing.

The digital output of the AD7998BRU-0 is also easy to use as it is a self-contained unit, as it requires no external components for normal operation. All that is needed is a power supply and the analog input signal. The data is then sent to an output register which can be read by a microprocessor or a computer.

In conclusion, the AD7998BRU-0 can be used in many applications in data acquisition, as it is integrated with a variable gain amplifier, low-noise amplifier, voltage reference, clock generator and analog-to-digital converter. It is also useful in measuring temperature, pressure, flow, voltage and current, as it is easy to use and requires no external components. With an 8-bit resolution and digital output, the AD7998BRU-0 is a reliable and accurate solution for analog-to-digital conversions.

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