MAX1189BCUI+

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Data Acquisition - Analog to Digital Converters (ADCs) are essential in modern electronics, as they enable the conversion of an analog signal from one domain, typically physical measurements such as temperature, voltage, or pressure, to a digital domain suitable for electronic circuit operations. The MAX1189BCUI+ is a 16-bit, 500 ksps ADC designed to be embedded in high-performance, low-power applications such as medical instrumentation, military, and industrial. This application note provides an overview of the MAX1189BCUI+ application field and working principle.

The MAX1189BCUI+ is a differential successive approximation register (SAR) ADC designed to convert analog signals with 14-bit to 16-bit resolution. Its flexibility and high sampling rate of 500 ksps make it ideal for applications such as medical instrumentation, industrial control, and military/space applications. The device is low-noise and low-power, with an exceptionally low power dissipation of 30mW in power-down mode and a total quiescent current of 1.4mA in normal mode. The device can run with a supply voltage ranging from 2.7V to 5.5V, and features a wide analog input range of 400mVpp.

The architecture of the MAX1189BCUI+ is based on a differential SAR ADC. The core of the device consists of two analog inputs and one digital output. The analog inputs are the reference input, which is connected to a precision reference voltage, and the analog input, which is connected to the signal source. The digital output is the converted digital value. The analog input signals are converted by successive approximation and compared against the reference input.

The MAX1189BCUI+ operates in three basic stages: acquisition, conversion and settling. Acquisition is the first stage of operation and occurs when the device starts scanning for the analog signal reaching its input. During this stage, the reference and analog input signals are compared against each other and the device begins to measure the difference between the two. During conversion, the input is compared one bit at a time, until it reaches the desired resolution. During settling, the device ‘settles’ into the final digital result. At this point, the device is ready to continue its scan and measure another input.

The MAX1189BCUI+ is designed to handle wide input common-mode range and common-mode rejection ratio (CMRR) that is greater than 90 dB. It also offers a wide dynamic range of 0.2-2Vpp, which allows the device to handle low-frequency analog signals and large transient signals with precision. In addition, it has an ESD severity level of ±4kV (HBM), making it ideal for applications in medical and industrial instrumentation.

The MAX1189BCUI+ offers many features to facilitate successful integration into the application environment. It includes a Powercycler that switches power on and off when appropriate, and automatically turns off the device when inactive. It also has a selectable On/Off Sleep mode to optimize power usage. In addition, Fast Slew and Fast Set/Rest modes allow faster start-up times, reducing power consumption.

The MAX1189BCUI+ is a versatile device designed to meet the needs of many applications. It features high resolution conversion and high performance, along with low-power operation and flexibility. It is ideally suited for a variety of applications, including medical instrumentation, military, and industrial control. The device’s sampling rate, low noise, power efficiency, and wide range of analog inputs make it a great choice for an ADC in the application environment.

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