ADS8588SIPMR

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Analog to digital converters (ADC) are widely used in sensing data within a circuit. Being able to convert a continuous analog signal into a digital signal makes it easier to use in a variety of applications, from medical to military due to accuracy and speed. Among the ADC of general purpose is the ADS8588SIPMR from Texas Instruments. This device is designed for sampling and integrating 10-bit data acquisition in a single-channel, single-ended analog input which can be configured for either highest power or lowest power.

The device operates between 2.7V and 5.25V, making it ideal for portable applications, with a minimum supply current of 3 mA in active mode, and 0.2 µA in power down mode. Other features include an external reference with adjustable gain, serial peripheral interface (SPI) and low pass filters. Additionally, regarding its output, this ADC is capable of either left or right justified data formats.

ADS8588SIPMR includes also a Serial Interrupt Processor (SLIP) which allows the user to configure various parameters according to their needs such as a combination of conversion resolution, software driven data management, multiple-ram average, alert thresholds and detection of missing samples.

At the heart of the device is the conversion of the analog signal into a digital signal. This is done by using a successive approximation analog-to-digital converter (SAR) converter technique which is composed by three main components as follows: comparator, DAC (Digital to Analog Converter) and logic circuit.

Firstly, in legacy mode, the logic circuit sends the first step of conversion and it sends a bit from the input binary set, referred to as the most significant bit (MSB). This bit is compared to the analog output from the DAC and the result is sent back to the logic circuit (1 if higher and 0 if lower). The process is repeated for each successive bit of the data set until all bits are transmitted.

In the case of ADS8588SIPMR, this ADC also includes an internal reference which, when enabled, adds a fixed voltage to SAR output. This enables the user to manipulate the gain of the system without changing the transfer characteristic of the converter.

The ADS8588SIPMR from Texas Instruments is designed for multiple applications from military to medical, such as electrocardiogram and infrared sensing. Being able to sample and hold signals with 10-bit resolution makes it the ideal ADC for such kind of applications.

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