AD7923BRUZ

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Data acquisition of analog to digital converters (ADC) includes the processing and transferring of analog data from one device to another. The AD7923BRUZ is an ADC from Analog Devices that provides the necessary conversions of analog signals to digital ones for accurate data acquisition. This ADC is designed for applications that require low-noise and low-power operation, such as medical and industrial measurement applications.

Overview

The AD7923BRUZ is a low-power, high-speed, successive approximation register (SAR) ADC with an internal reference and operates from an external 2.3 V to 3.6 V power supply. This ADC has a throughput of up to 1 MS/s as well as a maximum conversion rate of 5 MS/s. It has a 5-bit current-source digital-to-analog converter (DAC) and a charge redistribution SAR architecture that enables it to obtain 14-bit resolution. This ADC also has a wide input dynamic range of 0.15 V ±200 mV that is suitable for applications that require precision. It offers 1 mV, LSB INL (integral non-linearity) and a THD (total harmonic distortion) of –150 dB that allows it to produce greater accuracy.

Features

The main features of the AD7923BRUZ ADC include:

• High speed - Max conversion rate of 5 MS/s and throughput of 1 MS/s
• Low power consumption - Operates from a 2.3 V to 3.6 V power supply and has a maximum power consumption of <500 μW
• High accuracy - 14-bit resolution, 0.15 V ±200 mV input dynamic range and 1 mV, LSB INL
• Low noise - THD of -150 dB for greater accuracy
• Built-in reference - Internal reference for easy system design

Applications

The AD7923BRUZ is used in applications where low-noise and low-power operation are of utmost importance. This ADC can be found in a wide range of applications including:

• Medical instruments for measuring several parameters, such as heart rate, respiration, oxygen saturation, and body temperature
• Industrial measurement and control applications, such as motor speed control, temperature sensing, and pressure sensing.
• Data acquisition systems, such as portable test equipment and remote measurement systems.

Working principle

The basic principle behind the working of the AD7923BRUZ is the classic flash ADC architecture. A flash ADC is an analog to digital converter that converts an analog voltage to a digital representation with a single comparison. The AD7923BRUZ enable rapid conversion from analog to digital form. This ADC has an internal 5-bit current-source DAC (digital to analog converter) and a charge redistribution SAR (Successive Approximation Register). The SAR converter converts the analog input signal to a digital output by successively approximating the value of the input signal.

When the AD7923BRUZ is powered up, the SAR logic stores the analog input voltage in its 5-bit DAC. It then reconfigures the DAC to store the next approximation of the input voltage. This process continues till all the bits of the DAC have been compared and the comparator decides the required output. The final value is latched into the output register and made available as the digital output. The speed of this conversion increases as the bits of the DAC increases.

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