AD7685ARMZ

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Introduction

The AD7685ARMZ is an analog-to-digital converter (ADC) from Analog Devices, one of the leading providers of data acquisition and signal conditioning products. The AD7685ARMZ is a low-power, precision, multichannel, 16-bit converter with on-board conversion and programmable sample rate using an ARM Cortex-M4 processor. It also includes a range of features such as an adjustable input range, digital I/O for triggering and synchronization, selectable 50/60 Hz rejection, and ARM high-speed DMA transfers.

Application Field

The AD7685ARMZ is designed for applications that require a high degree of precision and accuracy. It can be used in a variety of applications including industrial automation, railroad automation, instrumentation, aerospace and military, biomedical, and energy management. This ADC is particularly well-suited for precision Single-Ended-Input (SEI) or Differential-Input (DI) data acquisition with analog input signals ranging from +/-10 mV and up to 2.048 V. The adjustable input range allows users to capture small and large signals with a high degree of accuracy and resolution. With its on-board ARM Cortex-M4 processor, it is ideal for applications that require embedded processing.

Working Principle

The AD7685ARMZ works based on successive-approximation-based sampling techniques. It employs a 3-stage interleaved conversion scheme with a programmable sample rate up to 400 KHz. For SEI applications it can convert up to 8 independent channels, while in DI applications it can convert up to 4 differential channels. SEI conversion requires two clock cycles to convert a single sample, while DI conversion requires four clock cycles per sample. The first stage is the track-and-hold stage, where the input signal is stored until it is ready to be converted. The second stage is the conversion stage where the analog input is digitized and stored in the internal register. The final stage is the transfer stage, where the data is transferred out of the device and into the ARM Cortex-M4 processor for further processing.

The ARM Cortex-M4 processor helps reduce total system cost by better utilizing the internal and external resources. It helps to quickly analyze and process the incoming data and can even provide feedback control to the system. It is also capable of transferring data over different communication protocols such as USB, I2C and SPI making it very versatile.

Conclusion

The AD7685ARMZ is an advanced low-power data acquisition product with precision analog-to-digital conversion, programmable sample rate, adjustable input range, and onboard ARM Cortex-M4 processor. Its accurate conversion rate makes it ideal for a wide range of applications including industrial automation, railroad automation, instrumentation, aerospace and military, biomedical, and energy management. Its success is attributable to its ease of use, low power consumption, and its versatility.

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