Input configuration — pseudo-differential vs single-ended
In single-ended mode, all 8 inputs are referenced to a common ground. In pseudo-differential mode, the 4 inputs are each paired with a dedicated return line. The reference can be internal or external.
Package and mounting — 16-QSOP for tight boards
The MAX11603EEE+ comes in a 16-lead QSOP (3.90 mm body width), a surface-mount package that fits on dense mixed-signal boards alongside a small MCU and a few passives. The tube shipment is fine for bench builds; for production reels, check the 'T' suffix variant. The 0.154-inch (3.90 mm) width keeps the footprint compact — useful when the ADC shares a board edge with a connector bank.
Lifecycle and sourcing reality
The MAX11603EEE+ carries an active lifecycle status from Maxim (now part of Analog Devices). For a BOM line that needs an 8-bit I²C ADC, this is a safe choice for new designs — no imminent obsolescence risk.