ADC08038CIWMX Datasheet/PDFData Acquisition – Analog to Digital Converters (ADC)
The ADC08038CIWMX is a high performance 8-bit A/D converter with pseudo differential input stage (At complementary inputs AIN11 and AIN12). It is particularly suited to systems where low power drain, low noise performance and good resolution are essential features. This application brief explains the features and implementation of the ADC08038CIWMX device and provides details on the use of the device in a wide variety of data acquisition applications.
Application Area
The ADC08038CIWMX is ideal for use in consumer, industrial, and medical applications in which precise analog data needs to be converted to digital format. Its ability to measure both small and large signals with low noise performance makes it suitable for low-end, battery-powered applications where precise data acquisition is a must. Additionally, its low power operation (1.5 mA at ±15V) ensures that the battery-life is extended further than conventional analog-to-digital converters.
Medical applications such as cardiac pacemakers and medical imaging systems have benefited from the use of the ADC08038CIWMX due to its high precision and low power consumption. In imaging systems, this A/D converter is a valuable tool for measuring signal levels as small as 0.1 μV. Data acquisition systems for industrial processes such as temperature and pressure have also benefited from the use of this device, as it is capable of measuring signals with an accuracy of 0.3%.
Working Principle
The ADC08038CIWMX converts an analog signal into a digital signal by first amplifying the analog signal and then discretizing it into 8-bit words. The amplifier, or first stage of the converter, accepts differential signals and is capable of amplifying signals between ±15V and ±90V. The amplifier has a differential voltage gain, an offset voltage adjustment, and an input bias current adjustment.
The second stage of the ADC08038CIWMX is the clocking circuit. This stage consists of a frequency-locked loop which operates at a fixed frequency, typically chosen by the circuit designer or application engineer. The clocking circuit is responsible for sampling the input signal at regular intervals and then converting each sample into an 8-bit word.
The output of the converter is an 8-bit word which represents the digital signal. The resolution of the output word is dependent on the differential input signal and the reference voltage applied. In order to ensure maximum accuracy, each signal is compared to a reference and the output word is adjusted accordingly. The output word is then available for further signal processing.
Conclusion
The ADC08038CIWMX A/D converter is a high performance device which can be used in a wide variety of data acquisition applications. Its features such as low power consumption, high resolution and low noise performance make it particularly suited for portable and battery-powered products. Furthermore, its ability to measure signals with accuracy makes it a valuable tool in medical and industrial applications.