AD7490BCPZ

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Data Acquisition - Analog to Digital Converter (ADC) is an essential component in many electronic processing systems. The AD7490BCPZ, one of Analog Devices’ most popular ADCs is among the top choices for engineers and electronic manufacturers. This article will discuss the applications and working principle of the AD7490BCPZ.

Applications:

The AD7490BCPZ is a 16-bit bipolar successive-approximation analog-to-digital converter with integrated voltage reference and sample-and-hold circuit. It is designed to provide accurate, low power and high speed Analog-to-Digital Conversion (ADC). This device is ideal for a wide range of applications including pressure measurement, audio processing, image sensors, and industrial automation.

The converter’s low power design makes it suitable for battery-operated as well as handheld applications. It operates over a wide range of power supply voltages, from 2.7V to 5.5V and can convert analog inputs from -6V to +6V. This makes it ideal for industrial applications, which require a greater operating range and greater accuracy.

The converter is designed with low noise performance, enabling it to handle a range of dynamic signals and provide accurate results in noisy situations. This is reflected in its high SNR of 91dB at 20MHz conversion rate, which is among the best in the industry in its category. Its also offers fast conversion speeds, up to 20MHz, ideal for applications that require fast signal processing.

Working Principle:

The AD7490BCPZ is a successive-approximation analog-to- digital converter. This means it accurately converts an analog input voltage into a digital representation in binary code. The first step in the process is to measure the analog input voltage, which is accomplished by the integrated sample-and-hold circuit. This circuit captures the signal and freezes the analog-input voltage until the conversion process is complete.

Next, the converter steps through a binary search process to determine the digital code that best corresponds to the sampled voltage. At each step of the search, a reference voltage, typically generated by an onboard voltage reference, is compared to the input voltage and then adjusted accordingly. This process is repeated until the digital output code is within a given tolerance (.5LSB) of the input voltage.

The binary search is completed quickly due to the converter’s high conversion speeds, up to 20MHz. This allows the converter to respond quickly to changing analog signals, ensuring accurate results in dynamic systems.

Conclusion:

The AD7490BCPZ is an excellent analog-to-digital converter with wide range of applications, from audio processing to industrial automation. Its low-power design, low noise performance, and high conversion speeds make it an ideal choice for designers who need quick and accurate signal conversion in limited power supply scenarios.

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