AD7939BSUZ-REEL7

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Data Acquisition is the process of converting raw data from an analog input into a digital format for processing and analysis. An Analog to Digital Converter, or ADC, is an integrated circuit that performs this conversion. In this article we will look at the application field and working principle of AD7939BSUZ-REEL7, an ultra-low-power 12-bit ADC.

The AD7939BSUZ-REEL7, with its low power consumption, high data rate, and low-noise single-supply operation is well suited for portable, battery-operated systems and devices. As a 12-bit device, it provides a digital resolution of 4096 steps, and features a full-scale input range from 0.1mV to 100mV. This makes it an ideal device for use in low-level signal conditioning for medical, industrial, HVAC, and instrumentation applications.

The device has a maximum current consumption of 8µA, making it one of the lowest power 12-bit devices in the market. This makes the ADC suitable for extended operating times without the need for frequent battery replacements. Additionally, the AD7939BSUZ-REEL7 has a very low input voltage noise of 2.5µV RMS, making it appropriate for applications that are sensitive to noise. Furthermore, the wide operating temperature range, high EMC and RF immunity, and small form factor make it suitable for challenging industrial and medical environments.

The operating principle of the AD7939BSUZ-REEL7 is based on successive approximation. This technique works by comparing the input voltage to a voltage reference, and then changing or "adjusting" the internal digital code until the two voltages match. This process is done on each of the 12 internal bits of the ADC resulting in a 12-bit output digital code proportional to the input voltage.

The AD7939BSUZ-REEL7 achieves a maximum serial data rate of 140kSPS, which enables it to convert multiple analog inputs into a digital format in a very short amount of time. The ADC utilizes an analog input buffer, which amplifies the input signal before applying it to the internal successive approximation register (SAR). It also has programmable digital gains of x2 and x4, and a digitally controllable internal voltage reference. These features enable the device to be very flexible in terms of operation and configuration.

In summary, the AD7939BSUZ-REEL7 is an ultra-low-power 12-bit ADC with excellent performance characteristics. With its low power consumption, high data rate, wide operating temperature range, and low-noise single-supply operation, this device is well suited for low-level signal conditioning in a range of applications, from medical and industrial to HVAC and instrumentation.

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