AD7828KP-REEL

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Data Acquisition - Analog to Digital Converters (ADC): AD7828KP-REEL

Analog-to-digital converters (ADC) are an indispensable part of many kinds of electronic equipment where an analog signal needs to be accurately converted into a digital representation for further processing, analyzing and/or storing. One of the ADC products is the AD7828KP-REEL which is an 8-bit ADC with a high speed and low power operation, making it suitable for mobile devices. This article will discuss the application field and working principle of the AD7828KP-REEL.

Application Field

The AD7828KP-REEL is designed primarily for applications in mobile devices, where the combination of low power consumption and high speed are important criteria. It can be used in any application needing a digital representation of an analog signal, such as sensors, digital-tape recorders, musical instruments, audio devices, and general purpose A/D conversion. It is also suitable for precision measurement of electrical signals such as pressure, temperature and flow.

The AD7828KP-REEL can be used as a low power, low voltage, CMOS μ-weighted, 8-bit A/D converter. Its 5V single-supply operation makes it suitable for battery-operated portable equipment. The chip can perform linearity, conversion speed, and power requirements specifications. It has a 50kHz maximum conversion rate, making it suitable for slow sampling applications. The low power requirement ensures a long battery life.

Working Principle

An ADC is an electronic device that converts an analog signal into a digital one. The AD7828KP-REEL works on the principle of successive Approximation Register (SAR) which is a kind of digital-to-analog converter (DAC). In successive approximation, analog input is compared to a reference voltage. The digital output is generated based on the results of this comparison. Each bit of the digital output is stored until the final conversion process is complete.

The principle of SAR works by using the binary search algorithm. The algorithm works by first setting a voltage level, then comparing it to the input voltage. If the input voltage is higher than the preset level, the bit is set to one; if the input voltage is lower than the preset level, the bit is set to zero. This is repeated for each bit in the output, and each bit is stored in the register until the final output is generated.

The AD7828KP-REEL uses an 8-bit successive approximation register that has a built-in precision reference. The device has an integrated on-chip voltage reference (Vref) that is selectable between 0.5V, 0.25V, 0.125V and 0.0625V. This allows for a wide range of input voltages, which can be easily converted into a digital representation with good linearity.

The AD7828KP-REEL supports temperature compensation to maintain accuracy over the full temperature range. It also features an automatic hardware power-down mode and a digital error signaling feature. The power-down mode turns off the chip when it is idle, saving power, and the error signal alerts the user when an error has occurred in the conversion process.

Conclusion

The AD7828KP-REEL is a low power, low voltage, and high speed 8-bit Analog-to-Digital converter. It is suitable for many applications where an analog signal needs to be accurately converted into a digital representation. It works on the principle of successive approximation and has a built-in voltage reference and temperature compensation, allowing it to maintain accuracy over different temperatures and a low power consumption during idle.

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