ADS7813UBG4

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The ADS7813UBG4 is an integrated circuit produced by Texas Instruments, assembled in a 16-lead TSSOP package with an operating temperature range of -40 to +85 °C, and it belongs to the category of Data Acquisition - Analog to Digital Converters (ADC). It is a low-power, general-purpose, 16-bit, voltage-output A/D converter.

The ADS7813UBG4 contains an ultralow power, chopper-stabilized successive approximation register (SAR) A/D converter with an internal reference. The ADC has a maximum sampling rate of 11.2 ksps, with an 18-channel multiplexer. It includes an internalBandgap voltage reference, a sleep mode to reduce power consumption, and a maximum inputcompatible with the 0 V to 4 V rangeof the device.

The application field of the ADS7813UBG4 is wide and varied, ranging from measuring systems for industrial applications, automotive industries, medical devices, and data acquisition systems. This A/D converter is also a thermocouple-to-digital convertor with active cold-junction compensation for measuring the temperature of a surface.

The working principle of the ADS7813UBG4 is based on the well-known SAR architecture. It allows extremely high SNR (Signal-to-Noise Ratio) figures that reach up to 95 dB. A successive approximation register (SAR) implements a binary search algorithm to determine the digital approximation of an analog input voltage. The ADC starts by setting material bits of the n-bit ADC (where n is the bits of resolution of the device) accordingly to the most significant bit (MSB) of the pipeline register. Then the comparator is used to compare the voltage of the input signal with the most significant bit. If the voltage of the input signal is higher then the reference, the post-amp output is +V and the bit is set high; if the voltage of the input signal is lower then the reference, the bit is set low. This procedure is repeated for each bit, until all material bits of the n-bit ADC are determined.

The ADS7813UBG4 also includes an integrated voltage reference. The voltage reference provides a high-accuracy, autocalibrated reference, with a typical value of 1.22 V and an accuracy of ±1.0 % (max) over full temperature and load conditions. The integrated voltage reference also allows the chip to be optimized for both high-side and low-side input ranges and provided the best possible accuracy for all input ranges.

In conclusion, the ADS7813UBG4 is a useful component for various sensing and measurement applications, which offers plenty of features and benefits. Its wide application field, low power consumption, and high-resolution SAR architecture make it an advantageous component to be used in various data acquisition systems.

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