MAX196ACNI+

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The MAX196ACNI+ from Maxim Integrated is a special purpose analog-to-digital converter (ADC) that offers high-resolution conversion for a variety of applications. This device is designed for use in industrial, automotive, and aerospace applications where accuracy and speed are paramount. It is an ideal choice for applications such as test instrumentation, medical imaging, electronics test and measurement, and communication systems.

Application Field

The MAX196ACNI+ is well-suited for a wide range of applications requiring precision data acquisition. It is optimized for low-speed, single-ended analog input signals that are typically acquired in medical, automotive, and industrial testing and measurement applications. It is an ideal choice for applications that require higher resolution than available with traditional 8- or 12-bit devices, such as medical imaging, ultrasound, or signal conditioning. The device also features a two-channel differential direct sensing amplifier suitable for signal conditioning applications such as load cell and strain gauge detection. The MAX196ACNI+ is a high-performance ADC that provides reliable and accurate data-acquisition results at low input signal frequencies.

Working Principle

The MAX196ACNI+ features a 24-bit, successive-approximation register (SAR) ADC that operates from a single 5 V supply. It has a low-power consumption of 3.2 mA typical and uses a low-noise, low-distortion internal reference with a specified accuracy of 0.05%. It offers an excellent dynamic range of 97 dB (at 2 Hz bandwidth) and SNR of 90 dB at 1 kHz, enabling it to capture signals with high accuracy. The device also features an onboard sample-and-hold (SH) amplifier optimized for low distortion, quick settling, and low power.

The user can adjust the ADC aperture time (conversion speed) and input signal level with the onboard digital potentiometer. The device supports a wide range of sampling frequencies from 27.27 Hz up to 54.54 KHz, suitable for both low and high-speed sensing applications. The MAX196ACNI+ provides both single-ended and differential input types, allowing for a variety of signal-sensing configurations. The device offers two programmable voltage ranges (3V/ 1V) allowing for easy scaling and adjustment of the incoming signal.

The ADC uses a differential-type sampling architecture and performs multi-level sampling on the incoming signal. This feature minimizes aliasing due to the low sample rate and allows for more accurate data-acquisition results. The precision 8-bit digital-to-analog converter (DAC) outputs a reference voltage from the onboard 5 V reference. The user can adjust the output in 0.25 mV increments for fine-tuning. The device also supports the P1101B digital calibration algorithm for improved system-level performance.

The MAX196ACNI+ features a high SNR (signal-to-noise ratio) of 90 dB and a crosstalk performance of -90 dB, allowing for a clear, noise-free signal. It also features an integrated digital output filter for improved linearity and performance. This filter allows for more accurate interpretation of the incoming signal and increases the overall data accuracy of the device. A unique feature of the MAX196ACNI+ is its power-down mode which reduces the power consumption to only 0.45 mA when the device is not actively converting.

Conclusion

The Maxim Integrated MAX196ACNI+ is an ideal solution for precision analog-to-digital conversion applications. Its onboard sample-and-hold amplifier and digital calibration algorithm provide improved linearity and performance. The device operates with a single 5 V power supply and has a low power consumption of 3.2 mA typical. It features a two-channel differential sensing amplifier suitable for load cell and strain gauge detection, as well as a high SNR of 90 dB and a crosstalk performance of -90 dB. The MAX196ACNI+ is an ideal choice for a wide range of demanding applications requiring precision data acquisition.

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