ADS1294RIZXGR

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Data acquisition is a process of measuring physical phenomena, such as temperature, pressure, or sound, and converting themeasured information into a digital formatfor further processing or analysis. Analog front end (AFE) is an important part of data acquisition systems, which enables direct analog-to-digital conversion of input signals. The ADS1294RIZXGR is an AFE device manufactured by Texas Instruments for interfacing with sensors and other analog sources. This article provides an overview of the ADS1294RIZXGR application field and its working principle.

ADS1294RIZXGR Application Field

The ADS1294RIZXGR is an 8-channel, low-noise, low-power, 24-bit A/D converter with selectable gain. It provides protection from overvoltage, undervoltage and ESD/EMI on all channels, and is capable of providing 15uV (typical) noise performance across its entire +/-10V input range. The device is suitable for use in measurement applications such as industrial, environmental, medical, and energy metering, as well as in sensor conditioning on applications such as robotics and automotive environment control.

The ADS1294RIZXGR provides various features that make it suitable for these applications, including a programmable SHDN pin, up to two ASSPs (application-specific standard products) that can be used to power down unused channels and a programmable power-down timer for saving power, and a selectable single-ended or differential input mode. In addition, the device supports up to 160 programmable gain settings, as well as input overload protection on all channels, enabling it to interact with a wide variety of sensor types.

ADS1294RIZXGR Working Principle

The ADS1294RIZXGR operates in single-ended or differential input mode, and can be used with single and dual supply supplies of up to 18V. The device is powered by a specialized Analog Front-End (AFE) chip, which receives an analog signal from a sensor and then processes it into a digital signal.

The AFE chip is composed of an input multiplexer, one or more gain stages, an anti-aliasing filter, an analog-to-digital converter, and a digital-to-analog converter (DAC). The input multiplexer is used to select which of the 8 input channels the signal is coming from. Then the gain stages are used to adjust the magnitude of the signal. This is followed by the anti-aliasing filter, which is used to remove any unwanted noise from the signal before it is converted from an analog signal to a digital signal.

The Analog-to-Digital Converter (ADC) of the ADS1294RIZXGR is a 16-bit pipelined SAR (successive approximation register) ADC with a sampling rate of up to 250kHz. The ADC contains a internal circuitry for protecting the device from overvoltage, undervoltage, and ESD/EMI on all channels, and a programmable SHDN pin which can be used whenever the ADC is not actively in use to save power. Finally, the Digital-to-Analog Converter (DAC) is used to convert the digital signal back into an analog form in order to be available for further processing, or to be sent to a digital-to-analog interface.

Conclusion

The ADS1294RIZXGR is a low-noise, low-power, 8-channel, 24-bit Analog Front End (AFE) device manufactured by Texas Instruments. The device can be used in numerous measurement applications and sensor interfacing, thanks to its multiple features such as selectable single-ended or differential input mode, up to 160 gain settings, and various protection features. The device includes an AFE chip composed of an input multiplexer, gain stages, anti-aliasing filter, analog-to-digital converter, and digital-to-analog converter, and provides up to 250kHz sampling rate. The ADS1294RIZXGR is an excellent choice for applications requiring robust, precision data acquisition.

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