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AD421BNZ Application Field and Working Principle

The AD421BNZ is an application-specific standard product (ASSP) in the field of data acquisition and conversion. This Analog-to-Digital Converter (ADC) is designed to provide high performance solutions for both industrial and consumer electronic builders. Its size and performance make it an ideal choice for a variety of applications such as medical imaging, scientific instrumentation, and energy management systems.

The AD421BNZ is a single-supply, 10-bit, first-order sigma-delta converter with an input analog voltage range of 0-5V. It can accept an input sample rate of up to 7.8125 kHz while still achieving excellent linearity and low noise. This ADC is manufactured using a low voltage CMOS technology, and it has been designed to be tolerant to power supply and temperature fluctuations. The AD421BNZ is capable of operating over a temperature range of -25 to 85 ˚C and comes with the option of having its supply voltage either internally regulated or externally regulated.

Specifications

The AD421BNZ offers a wide range of features to meet the needs of various applications. Some of its main specifications are as follows:

• Input Range: 0-5V
• Resolution: 10-bit
• Sample Rate: Up to 7.8 kHz
• Linearity: 0.01% Differential Nonlinearity (DNL)
• Noise: 0.009°² rms
• Supply Voltage: 2.3-3.6V
• Supply Current: 18mA (typical)

Working Principle

The AD421BNZ is a 10-bit sigma-delta ADC with an on-chip digital filter. This converter uses successive approximation to convert an analog signal into a digital signal. It has a 1st-order sigma-delta modulator which works in the Σ∆ architecture, using 1-bit quantization, followed by an onboard digital filter to reduce the noise of the signal. There are two main types of sigma-delta modulators: low-order and high-order. The AD421BNZ uses a low-order modulator operating in the first order, i.e. it has two integrators, one for the signal and one for the reference voltage. The output of these two integrators is sampled and compared by the comparator.

The output of the comparator is then fed to the digital filter. The filter receives the 1-bit output and applies digital signal processing (DSP) techniques to reduce the noise of the signal. The digital filter uses a low-pass or band-pass filter depending on the application. The filter will then output a 10-bit digital signal which is equivalent to the analog signal that was fed into the ADC.

Applications

The AD421BNZ has a wide array of applications due to its specific design and performance. It is suitable for use in medical imaging, scientific instrumentation and energy management systems. It is also used in industrial automation and process control, such as in industrial robots, automated guided vehicles and machine vision systems. This ADC is also suitable for general-purpose signal conditioning applications, as it provides high precision and low noise performance. Additionally, it can be used in automotive, aerospace and military applications since it has excellent tolerance to temperature changes.

Conclusion

The AD421BNZ is an ideal choice for applications involving data acquisition, conversion and signal conditioning due to its small size, wide range of features and high performance. Its design allows it to operate over a wide temperature range while providing superior linearity and low noise performance. Its compatibility with various applications makes it a suitable choice for various industries such as medical imaging, Scientific instrumentation, industrial automation and military.

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