MAX11645EUA+

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Analog-to-digital converters (ADCs) are a central element in the data acquisition process, providing the means to convert an analog signal into a digital format. The MAX11645EUA+ is a precision, low-power, 16-bit successive-approximation register (SAR) ADC that is designed for sensor or transducer signal-conditioning applications. In this article, we will look at the application fields and working principle of the MAX11645EUA+.

Applications

The MAX11645EUA+ offers a 16-bit ADC resolution for signal-conditioning applications, including strain gauges, pressure sensors, thermocouples, RTDs, and humidity sensors. The device is available in two package options: an MSOP-8 and an MSOP-12. The MSOP-8 package includes an integrated reset switch, while the MSOP-12 includes an integrated S&H switch and a reset switch. The reset switch can be used to reset the ADC to its minimum code state in order to ensure that no spurious data is present at the output when the ADC is first powered up.

The MAX11645EUA+ also features an integrated S&H switch. This switch enables the ADC to sample an incoming signal, hold it at the ADC’s input node, and then convert it to the digital domain. It functions as a one-shot sample and hold, which can be used in applications that require the capture of transients such as thermocouple and strain gauge sensors. The device also features low idle power consumption (no more than 100?A in sleep mode), which makes it ideal for portable battery-powered applications.

Working Principle

The MAX11645EUA+ is a 16-bit SAR ADC which utilizes a three-step process for converting an analog signal into a digital signal. The ADC’s input signal is first pre-amplified before being applied to the ADC’s analog-to-digital converter. The pre-amplifier amplifies the input signal such that the ADC is able to detect the signal’s full dynamic range. Once the signal is pre-amplified, it is then applied to an analog signal processor/comparator which compares the amplified signal against a series of voltage references.

Next, the analog signal processor/comparator determines the bit value that best represents the input signal and applies that bit value to the output register. This process is repeated until all 16 bits have been evaluated and converted. Finally, the output register outputs the resulting 16-bit digital word, which can then be read and interpreted by a processor or microcontroller.

Conclusion

The MAX11645EUA+ is an ideal ADC for signal-conditioning applications that require precise, low-power performance. It features an integrated reset switch, S&H switch and low idle power consumption. It utilizes a three-step process for analog-to-digital conversion and outputs a 16-bit digital word which can be read and interpreted by a processor or microcontroller.

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