AD7891AP-2

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AD7891AP-2 is a 10-bit, 8-channel successive-approximation analog-to-digital converter (ADC), which usually used in Data Acquisition - ADCs/DACs - Special Purpose applications. It has a low noise, low power and small size, which makes it suitable for a wide variety of applications.

The working principle of the AD7891AP-2 lies in its successive-approximation converter, which operates on the principle of measuring the difference between the unknown input signal and the output of the digital-to-analog converter (DAC). By adjusting the output of the DAC to match the unknown signal, the voltage difference between them reaches a minimal value. From the voltage difference and the output of the DAC, the unknown input signal can be determined.

The AD7891AP-2 features a wide signal-to-noise ratio (SNR) of 86dB, making it suitable for high-precision signal sampling and measurement. It also offers low-offset error and a low current-consumption of 250μA, allowing it to be used on mobile and battery-driven systems.

The AD7891AP-2 is mainly used in wireless applications such as Wi-Fi, Bluetooth and ZigBee, thanks to its low power consumption and noise levels. It is also suitable for use in automotive applications, as it can measure the analog signals from sensors and other sensor-related systems. Additionally, it can also be used in medical applications such as patient monitoring, where its low power consumption and accuracy are important factors.

The AD7891AP-2 also has built-in temperature-compensation circuitry which can reduce the effects of temperature-induced errors. This further improves the accuracy of the ADC and makes it suitable for high-temperature environments.

The AD7891AP-2 features 8 analog inputs, a low-power sleep mode, a low offset of 30mV and a low input impedance of 2.2 megohms. It also offers an external reference voltage of 7V and a wide operating temperature range of -40℃ to 85℃. This makes it suitable for a variety of applications, including those in which large temperature variations are expected.

Overall, the AD7891AP-2 is a versatile ADC with a high-resolution and low-power architecture. Thanks to its wide signal-to-noise ratio, low input impedance and temperature compensation, it can be used in a variety of applications where high accuracy and low power consumption are required.

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