10-bit SAR ADC on I²C — what the ratings mean for your BOM
The MAX1138EEE+T is a 10-bit successive-approximation ADC from Analog Devices, sampling at 94.4 ksps over an I²C bus. It accepts either differential or single-ended inputs — six in differential mode, twelve in single-ended — through an internal multiplexer and sample-and-hold. The 5 V analog and digital supply rails keep the signal chain simple: no split-rail regulator needed. The 16-QSOP package (3.90 mm body width) fits tight mixed-signal layouts where board area is the constraint. Operating temperature from -40°C to 85°C covers industrial environments — motor drives, outdoor telecom, factory automation — without a heat sink.
Package and supply — board-fit notes
16-QSOP is a 3.90 mm-wide body, 0.154 inch pitch — standard for mixed-signal boards. Single 5 V supply for both analog and digital sections; no charge pump or dual supply needed. The SAR architecture draws no static current between conversions, so average power scales with sample rate.
Lifecycle and sourcing
No last-time-buy notice or end-of-life announcement is on record. No pin-compatible second source is listed in the official cross-reference, so dual-sourcing requires a separate qualification if supply resilience is critical.