MAX1228BCEP+T

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The MAX1228BCEP+T is a low power, low noise, 12-bit analog-to-digital (A/D) converter designed for applications ranging from 2.7V to 5.5V operating voltage and up to 200ksps sampling rate.

It is housed in a tiny 5mm x 4.4mm package, making it one of the smallest, most efficient A/D converters in its class. Built using a CMOS process, it features a conversion time of under 10nS and less than 1 LSB of integral nonlinearity. It is ideal for use in portable applications where low power and a small form factor are important.

The MAX1228BCEP+T has an on board reference voltage of 3.3V, as well as an internal two-step/track-and-hold function that together provide a high accuracy A/D conversion. It also has an integrated low-pass filter to reduce noise and provides a good signal-to-noise ratio. Up to four multiplexed channels can be addressed to sample multiple input signals, reducing cost and board space further.

The operating principle of the MAX1228BCEP+T is based on a voltage divider and a switched capacitor. An analog input is applied to Vref, where it is compared to an analog reference voltage generated by an on-chip current source. The difference in voltage is measured by an internal offset-nulling circuit.

The offset-nulling circuit adjusts the voltage to match the reference voltage, and then outputs a digital code value proportional to the analog input voltage. This code is then used to produce the digital output. The device also features a zero-to-full-scale adjustment, which allows the output resolution to be adjusted to improve A/D conversion accuracy.

The MAX1228BCEP+T is typically used in battery-powered applications such as automotive and portable medical equipment, where accuracy and low cost are critical. With its high accuracy, low power consumption, and small form factor, the MAX1228BCEP+T offers the perfect solution for these types of applications.

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