ADS7817UG4

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Data acquisition is an important part of modern electronic systems, and analog-to-digital converters (ADCs) play a crucial role in it. The ADS7817UG4 is a high performance, 8-bit, low power, Sigma Delta ADC from Texas Instruments which is suitable for various kinds of applications. This article will provide an overview of the application field and working principle of this ADC.

ADS7817UG4 Overview

The ADS7817UG4 is an 8-bit ADC from Texas Instruments that operates from a single 2.7V to 5.5V supply voltage. It is a low power device that supports a wide range of operating conditions including single ended and differential input voltages, wide range of operating sampling rates, low power shutdown mode and adjustable reference voltage, making it useful for most data acquisition systems. It has an inbuilt temperature sensor that has a resolution of 0.25°C and provides up to ±0.38°C accuracy. This ADC also has an internal high speed 4-bit PWM output and two programmable general purpose I/Os.

The ADS7817UG4 is suitable for use in a wide range of applications including industrial, automotive, and medical applications. It can be used in temperature measurements, voltage measurements, and current measurements. It is also suitable for use in portable and handheld devices where the small size and low power consumption are desirable. Additionally, it is suitable for use in image sensors, motion detection, and vibration and noise measurement.

ADS7817UG4 Working Principle

The ADS7817UG4 is an 8-bit sigma-delta ADC based on a switched-capacitor architecture. It consists of a modulator, a digital filter, and a converter. The modulator is responsible for the conversion of the analog signals to a digital bit stream. It uses a delta-sigma encoding technique to convert the analog input to a digital bit stream. The digital filter is responsible for the noise shaping of the digital bit stream, and the converter is used to quantize the digital bit stream.

The ADC works in two steps. In the first step, the modulator takes the analog input and encodes it into a bit stream. This is done using a switched-capacitor structure and a differential comparator. The output of the modulator is a bit stream with a large amount of noise, which is then passed through a digital filter. The filter is used to shape the noise and reduce the number of digital words to be transmitted in the digital bit stream. Finally, the filtered digital bit stream is converted to an 8-bit output by the converter.

Conclusion

The ADS7817UG4 from Texas Instruments is a high performance and compact 8-bit ADC. It is suitable for a wide variety of applications and supports a range of operating conditions. It is an ideal choice for temperature, voltage, and current measurement applications, and can also be used in portable and handheld devices due to its low power consumption. The ADC works on a switched-capacitor architecture and uses a two-step sigma-delta encoding technique to convert analog signals to a digital bit stream.

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