MAX187AEWE+

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Data Acquisition - Analog to Digital Converters (ADC) includes a wide range of devices used to convert analog electrical signals into digital form, so that the information can be analyzed, manipulated, and stored in a computer. MAX1871AEWE+ is a great example of such an ADC, used in applications requiring highly reliable performance, wide dynamic range, and low power consumption. This article will explain the specification and application field of MAX1871AEWE+, and discuss its working principle.

MAX1871AEWE+ is a sigma-delta converter providing reliable and accurate data acquisition, with excellent performance even over extended temperature ranges (from -40°C to +85°C). Its high SNR/DR is 109 dB/87 dB and ensures high quality data capturing. As for its sampling rate, it can range from a few Hz to 65 kHz.

The application field of MAX1871AEWE+ is very wide, it’s often used in Automotive, Industrial and Medical applications where high performance is required. In Automotive, it is often used for the vehicle\'s part-specific signal acquisitions, such as oxygen sensors or Lambda probes. In Industrial, it’s well suited for harsh environment, such as electric motor control, factory automation, elevators and injection molding. In Medical, it is used in many medical-grade data acquisition systems, such as vital signs monitoring and patient electrocardiogram (ECG) recording.

This device makes use of the Sigma-Delta strategy, which can be split in two stages, the modulator and the digital filter. The modulator part is responsible for the quantization (calculating the digital output code) based on the analog input signal.This stage is made of a conventional OpAmp Peak Detector, a comparator, a DAC and a loop Filter (usually a low-pass filter). During its operation, the device will sample the input signal, compare it to a triangular waveform coming from the DAC, calculate the code and output it. The digital filter will reduce the output noise and clear the signal.

Additionally, the digital filter includes a powerful auto-calibration feature that continuously delivers optimal noise performance, ensuring accuracy over time and temperature. This feature also enables high speed conversions (> 50k/s), without manual adjustments.

To conclude, MAX1871AEWE+ is an excellent choice for data acquisition applications that require highly reliable performance, wide dynamic range, and low power consumption. Its vast application field and its powerful features, combined with the robustness of its sigma-delta strategy, make it an ideal choice for many different types of Analog to Digital converters.

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