ADS7835EB/250

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Data acquisition is the process of sampling signals that measure physical conditions and converting this data into digital numeric values that can be manipulated by a computer. Analog to digital converters (ADC) are key devices in this process due to their ability to convert analog signals into digital signals, enabling a computer to interact with the signals. The ADS7835EB/250 is a 16-bit ADC with a single 8-channel input, capable of sampling from 0-5V with a sampling rate of 250ksps. In this article, we will discuss the application field and working principle of the ADS7835EB/250.

Application Field

The ADS7835EB/250 is suitable for applications that require highly accurate data acquisition and signal discrimination. It is capable of recognizing various signal shapes within its operating range, such as sine waves, sawtooth waves, triangular waves and more. As such, it is used in many analog signal monitoring applications, such as measuring the temperature, pressure and humidity of an environment. To achieve these measurements, the ADS7835EB/250 is often integrated with sensor devices such as thermocouples, RTDs and relative humidity sensing devices.

The ADS7835EB/250 is also used in medical applications, such as monitoring vital signs of a patient. It is able to detect and convert weak signals from bio-sensors into digital signals that can be stored and analyzed by a computer. These signals are usually very small in magnitude, requiring the wide dynamic range of the ADS7835EB/250 to be accurately measured. Furthermore, many medical systems require remote data acquisition and transmission, which is achievable by connecting the ADS7835EB/250 to a wireless or GSM module.

In addition, the ADS7835EB/250 is also used in consumer electronics and audio applications. It is capable of recognizing and converting audio signals into digital signals, which can then be processed and stored by a computer. This is especially useful in low-power audio applications, as it is able to accurately detect and amplify small signals.

Working Principle

At a high level, the working principle of the ADS7835EB/250 is simple. It consists of an analog section and a digital section, with a comparator in between. The analog section receives an analog input signal and amplifies it to the full differential voltage range of the converter, allowing for accurate and reliable signal acquisition. The amplified signal is then fed into the comparator, which converts the analog signal into a digital 16-bit value.

In more detail, the analog section of the ADS7835EB/250 consists of a programmable gain amplifier, an offset adjust circuit and a low pass filter. The programmable gain amplifier amplifies the input signal to the full differential voltage range, and the offset adjust circuit is used to remove the offset error, if present. The low pass filter is then used to filter out unwanted noise that could interfere with the correct operation of the converter.

After the input signal is properly amplified, it is fed into the comparator which is responsible for the analog to digital conversion. This is done by comparing the input signal with a reference voltage and outputting the resulting digital signal. The reference voltage is generated by a bandgap voltage reference, and it is stable, accurate and repeatable, allowing for reliable data acquisition even in harsh environments.

The digital section of the ADS7835EB/250 receives the digital output from the comparator and then processes it to the final 16-bit digital result. This is done by a digital signal processor, which is responsible for signal conditioning, data formatting and other calculations. The digital signal processor can also be used for averaging multiple samples, saving transients and other signal processing tasks.

Conclusion

In conclusion, the ADS7835EB/250 is a powerful ADC with a single 8-channel input, capable of accurately converting small analog signals into digital signals. It is suitable for applications that require signal discrimination and high accuracy data acquisition, such as medical and consumer electronic applications. Furthermore, its accuracy is ensured through the combination of a programmable gain amplifier, offset adjust circuit, low pass filter and a bandgap voltage reference. All of these components work together to ensure that the ADC performs reliably, even in harsh environments.

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