If your design requires higher accuracy measurement than what a 12-bit Analog-to-Digital Converter (ADC) could provide, then considering ADC 2 Click Board™ would prove to be an ideal choice.
ADC 2 Click carries MCP3551/3, which is a 22-bit ADC with automatic internal offset and gain calibration. This high precision analogue-to-digital converter has a total unadjusted error of less than 10 ppm and low-output noise of 2.5 µV RMS. The board carries two pairs of screw terminals: VIN- for bringing in reference voltage, VIN+ for the positive voltage. VCC out and GND are output voltages. The click communicates with the target board through mikroBUS CS, CSK and MISO lines. Can use either a 3.3V or 5V power supply.