12-bit SAR ADC with I2C — 94.4 kS/s and configurable input mux
The MAX1238EEE+: It communicates over an I2C interface and offers a flexible input multiplexer: six differential channels or 12 single-ended channels, selected per conversion. The internal reference and track/hold simplify the external BOM — just a 5V supply and a few decoupling caps. Typical applications include industrial sensor acquisition, battery monitoring, and data-logging systems where moderate speed and multi-channel scanning are needed.
Input configuration — six differential or twelve single-ended
The input mux offers six differential or twelve single-ended inputs. The SAR architecture and 1:1 S/H-to-ADC ratio give each channel its own sample-and-hold.
Supply and interface — 5V rail, I2C bus
Both analog and digital supplies run at 5V, so the ADC's full-scale range matches a 0–5V input span without external level shifting. The I2C interface uses standard 100 kHz or 400 kHz clock rates; the ADC's own conversion clock is internal, so the bus speed doesn't limit throughput.
The 5V supply is common in industrial 24V systems after a simple 5V regulator, keeping the power rail clean.