MAX1271BENG+

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Data Acquisition - ADCs/DACs - Special Purpose

The MAX1271BENG+ is a specialized integrated circuit designed to provide data acquisition applications with accurate, high-resolution analog-to-digital (A/D) conversion capability. It is a 12-bit, single-channel A/D converter with a choice of two input ranges: 0 to +10V and -10V to +10V. This differential input range allows the converter to use a bipolar power supply. The MAX1271BENG+ is different from other A/D converters in that it is an integrated circuit (IC) with the A/D circuitry and the control logic integrated together. This eliminates the need for multiple components, such as resistors and capacitors, which must be integrated with external logic circuits to create a single A/D converter.

These components are integrated into the MAX1271BENG+ in the form of low-leakage, high-bandwidth charge pumps and differential amplifiers. The charge pumps are designed to provide fast, accurate charge transfers in microsecond time intervals. The differential amplifiers are designed to provide high-sensitive, low-noise measurements over a wide dynamic input range. Together, these components provide an easily programmable analog-to-digital converter capable of producing readings with an accuracy of up to +/-12.5mV.

The MAX1271BENG+ also includes a programmable gain amplifier (PGA), which can be used to increase the voltage range of the A/D converter. By configuring the PGA, the user can amplify the input signal by a factor of up to 8. The amplifier also corrects for linearity errors caused by the differential amplifier, allowing the converter to produce more accurate measurements. The large dynamic range of the input signal, combined with the PGA, enables the MAX1271BENG+ to accurately convert both large and small signals.

The converter uses a modified two-step successive approximation A/D conversion process. This process allows the converter to quickly and accurately convert the input signal into its digital equivalent. The first step of the conversion process is to measure the input voltage. The A/D logic circuit then correlates the measurements with an internal 12-bit resolution table, which corresponds to the input voltage. During the second step of the conversion process, the PGA, charge pump, and A/D logic circuit compare the input voltage against predetermined thresholds and generate a digital output.

The converter also includes a built-in calibration system, which can be used to adjust the readings for offset errors. The calibration system compares the measured values against pre-programmed ideal values stored in the internal reference table and adjusts the output accordingly. This system ensures that the MAX1271BENG+ produces consistent and accurate results, regardless of variations in the input signal.

The MAX1271BENG+ has numerous applications in data acquisition, ranging from automotive test and measurement systems to industrial process control. Its two-step successive approximation A/D conversion process and built-in calibration system make it an ideal choice for applications that require high-resolution, accurate data acquisition.

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