12-bit SAR ADC with I2C — 94.4 kSPS in an 8-pin uMAX
The MAX1237EUA+ is a 12-bit successive-approximation (SAR) ADC from Analog Devices, sampling at 94.4 kSPS over an I²C interface. It accepts either differential or single-ended inputs, configurable as two differential or four single-ended channels via the internal mux. The internal reference option saves an external reference IC when board space is tight.
Input flexibility and conversion architecture
The input mux lets you select two differential pairs or four single-ended channels — the same pinout serves both topologies, so a single PCB layout covers either configuration by changing the firmware mux setting. The 1:1 S/H-to-ADC ratio means each conversion samples the input directly without a pipelined delay. SAR architecture delivers no pipeline latency — the conversion result for a given sample is available at the end of that conversion cycle, making it suitable for multiplexed systems where channel switching happens between conversions.
RoHS3 compliant, so it passes the EU material restriction requirements without a waiver. The tube packaging is standard for the 8-µMAX footprint; reel or tape options may be available through alternate order codes.