AD7890AR-2

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Data Acquisition - ADCs/DACs - Special Purpose

The AD7890AR-2 is an application specific integrated circuit (ASIC) that provides a highly integrated mixed signal solution for data acquisition systems. It is designed for use in a wide variety of applications, including power management, industrial control, automotive, and medical instrumentation. This application specific device is suitable for applications where a high degree of functionality, accuracy and reliability are required.

The AD7890AR-2 integrates several analog-to-digital (ADC) and digital-to-analog (DAC) converters, providing a single solution for data acquisition systems needing both analog and digital inputs. The device combines a high-resolution 12-bit sigma-delta ADC, an 8-bit DAC, an op amp, and a 12-bit digital-to-analog (DAC) converter. This integration allows the AD7890AR-2 to offer high performance, accuracy, and low power consumption.

The AD7890AR-2 offers a wide dynamic range, with a differential nonlinearity (DNL) of 1 LSB and a total unadjusted error (TUE) of 1.7 LSB. This high accuracy is achieved through the use of two high-precision, 12-bit sigma-delta ADC architecture. The 8-bit DAC allows for digital controls, such as setting operating parameters, directly. The AD7890AR-2 also features a wide supply voltage range and low power consumption, making it an ideal solution for a variety of applications.

The design of the AD7890AR-2 makes the device ideal for a variety of applications, such as intelligent metering, industrial process control, automotive, power management, and more. In the industrial process control application, the 12-bit sigma-delta ADC provides high precision and accuracy for monitoring process temperatures, pressures, and flows. In the automotive sector, the AD7890AR-2 can be used for fuel injection and ignition control, engine control, as well as monitoring driving conditions.

For power management, the AD7890AR-2 can be used to monitor, measure, and optimize energy usage. The high-resolution ADC can also be used for voltage, current, and power monitoring for environmentally conscious applications. Finally, the device can also be used for medical instrumentation, such as vital sign monitoring and telemedicine applications.

In terms of working principle, the AD7890AR-2 is a single-channel, high-resolution, sigma-delta ADC that performs continuous conversion of a single analog input signal into a 12-bit digital value. The ADC uses a modulator architecture and is based on a series of integrators and a comparator. The input signal is sent to the modulator as a sequence of pulses, and the integrators convert this pulse sequence into a voltage waveform. The voltage waveform is compared to the reference voltage, and the digital value is generated depending on whether the voltage waveform is above or below the reference level.

The device also integrates an 8-bit DAC and an op amp, which allow for digital control of the input. The DAC drives the inputs and the op amp provides gain adjustment and level shifting for the input signals. This allows for precise analog signal conditioning for a variety of applications.

In conclusion, the AD7890AR-2 is a highly integrated mixed signal solution for data acquisition systems. It combines a high-resolution ADC, an 8-bit DAC, an op amp, and a 12-bit DAC for a complete solution for signal acquisition for a wide variety of applications. The device features high accuracy and low power consumption, making it suitable for applications where a high degree of performance and reliability is desired.

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