MAX1185ECM+TD

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The MAX1185ECM+TD is a precision analogy-to-digital converter (ADC) designed to convert an analogue voltage signal into a digital representation suitable for interfacing microcontrollers and other digital systems. It has been designed to suit a variety of applications including automotive, industrial, and medical and provides a high level of performance, efficiency, and integration. This article will explore the application and working principle of the MAX1185ECM+TD ADC in greater detail.

Applications of the MAX1185ECM+TD

The MAX1185ECM+TD is a versatile, low-power, single channel, 8-bit ADC ideal for a range of applications. The device operates on a single +2.7 to +5.5V supply and requires just 10.7mW of power when operating at 2.7V. It has been specifically designed for use in power-efficient systems and therefore finds many uses in embedded, automotive and medical applications. The ADC provides a 250kHz sampling rate, an input range of 0V to 3V and an integrated reference. These features make it well suited to sensing low-level signals such as pressure transducers, medical electrodes, temperature sensors, and acceleration and angular rate sensors.

Working Principle of the MAX1185ECM+TD

The MAX1185ECM+TD includes an internal 8-bit successive approximation register (SAR) to quickly convert analog voltage levels into 8-bit digital values. The device includes an adjustable, precision, reference voltage and a high-accuracy tracking-mode digital-to-analog converter (DAC). Each of these components combines to ensure an accurate, low-power and fast conversion.The SAR incorporates an internal comparator and associated logic with a clock to control the sequence of operations. A precision reference is required to ensure that the SAR can accurately determine whether the signal is above or below the reference voltage which indicates that the signal is either a logic one or zero.

The first step in the conversion is to charge an internal capacitor to the same voltage as the signal on the ADC pin. This voltage is compared with the reference voltage and the result is stored in the SAR. If the signal is greater than the reference the “1” is stored and a logic 0 is stored if the signal is less than the reference. This process is repeated seven more times until the signal is accurately converted and an 8-bit digital word is stored in the SAR. The MAX1185ECM+TD converter also includes a track-and-hold feature which allows the device to sample an analogue signal without the need for an external track-and-hold switch.

Conclusion

The MAX1185ECM+TD is an 8-bit precision ADC designed to deliver reliable, high-accuracy, low-power performance for a wide range of applications. The device incorporates an integrated reference voltage, a SAR and a track-and-hold feature which enables it to quickly and accurately sample analogue signals. It is well suited to a diverse range of embedded, automotive and medical applications.

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