In a recent blog post on omzlo.com, [Alain] explains how they found a bug in the Arduino SAMD21 analogRead() code which causes the output to be offset by between 25 mV and 57 mV. For a 12-bit ADC ...

AD16BSAR5M40LP is a 16-bit Successive Approximation Analog-to-Digital Converter (ADC) that operates up to 5MS/s. The ADC achieves full 16bit linearity, thanks to an in-built calibration engine present ...

Some Arduino boards, however, feature more advanced ADC chips with better resolutions (meaning, you get more precise values).

a 16-channel 1 MSPS Analog-to-Digital Converter (ADC), two comparators, and multiple I2C™, SPI, and UART interfaces. Not only is chipKIT the first Arduino-compatible platform to provide 32-bit ...

Linear Technology Corporation announces a 16-bit, 105Msps ADC that establishes a simple, new benchmark for digital communication between high speed ADCs and FPGAs. The LTC2274’s new high speed 2-wire ...

a dual 16-bit 5Msps simultaneous sampling, successive approximation register (SAR) ADC with flexible differential inputs. The LTC2323-16 from Linear Technology Corp. is a dual 16-bit, 5Msps ...

Linear Technology Corporation introduces a low-power 16-bit no missing codes, 80Msps analog-to-digital converter (ADC) that dissipates only 89mW, less than half the power of competing 16-bit ...