The MAX1108 from Maxim (now Analog Devices) is a single-supply, low-power, 2-channel, serial 8-bit analog-to-digital converter. It is a successive-approximation (SAR) ADC that integrates a track/hold, a voltage reference, clock and a serial interface, so it digitizes two analog inputs with minimal external parts. MAX1108EUB+T is the 10-pin uMAX (MSOP), lead-free, tape-and-reel version.

Its two channels (CH0, CH1) can be configured as two single-ended inputs or one differential pair, referred to the COM pin. The 4-wire serial interface (CS, SCLK, DIN, DOUT) is directly compatible with SPI/QSPI/MICROWIRE with no external logic, making it easy to read from any microcontroller. The device runs from a +2.7 V to +3.6 V supply (the MAX1109 is the +5 V version) and converts at up to 50 ksps.

It includes an internal +2.048 V reference (an external reference from 1.0 V to V_DD can also be used on the REF pin), and is built for low power: about 105 uA operating at +3 V and a 0.5 uA shutdown. That combination of small package, low supply and low current makes the MAX1108 a good fit for battery and remote-powered data acquisition.

Note: Values are taken from the Maxim MAX1108/MAX1109 datasheet. Confirm every parameter against the latest official documentation before committing a design.

MAX1108EUB+T is supplied in the 10-pin uMAX (MSOP); "+" marks the RoHS-compliant lead-free finish and "T" the tape-and-reel packing. The small uMAX footprint suits dense, battery-powered boards. Decouple V_DD and REF close to the pins, keep the analog input traces (CH0/CH1/COM) short and away from the digital serial lines, and route a clean ground. Package outline and pin-1 orientation are shown below.

📄 Full specifications are detailed in the official Maxim MAX1108/MAX1109 datasheet.

The 10-pin uMAX brings out the supply, two analog inputs, reference and the 4-wire serial interface:

• Pin 1 - VDD: Positive supply, +2.7 V to +3.6 V.
• Pin 2 - CH0: Analog input channel 0.
• Pin 3 - CH1: Analog input channel 1.
• Pin 4 - GND: Ground.
• Pin 5 - REF: Reference voltage (internal 2.048 V or external).
• Pin 6 - COM: Analog input common (GND or mid-supply single-ended; negative input in differential).
• Pin 7 - CS: Chip select, active low.
• Pin 8 - DIN: Serial data input.
• Pin 9 - DOUT: Serial data output (three-state).
• Pin 10 - SCLK: Serial clock input.

Pin 1 is marked below; CS is an active-low input.

The parts below are related Maxim serial ADCs in our catalog. Verify resolution, channels, interface and supply before substituting.

Selection Tips: Use the MAX1108 for a 2-channel 8-bit serial ADC on a +3 V rail. The MAX1107 is the single-channel version; the MAX1118 is a similar 2-channel 8-bit part in SOT23; for higher resolution step up to the 12-bit MAX11120 or 16-bit MAX11100.

Maxim Integrated (now part of Analog Devices) is known for low-power data converters. The MAX1108 packs a 2-channel 8-bit SAR ADC, reference and SPI-compatible serial interface into a tiny 10-pin uMAX, simplifying low-power data acquisition.

The device is backed by full datasheet characterization and application notes on input configuration, reference decoupling and serial timing - the details that determine accurate, low-power conversions.