Analog Devices Inc./Maxim Integrated MAX1106EUB+

Overview

The MAX1106EUB+ from Maxim Integrated is a low-power, single-supply, 8-bit successive-approximation analog-to-digital converter (ADC) with integrated track/hold, internal +2.048V reference, serial SPI/QSPI/MICROWIRE interface, and 25ksps conversion rate. It operates from +2.7V to +3.6V, draws only 96µA during conversion, and supports unipolar single-ended or pseudo-differential input configurations. It is used in portable data loggers and hand-held measurement devices where space, power, and precision are constrained.

For engineers reviewing the MAX1106EUB+ datasheet, MAX1106EUB+ pinout, MAX1106EUB+ application, or MAX1106EUB+ equivalent, key selection criteria include its 10-pin µMAX package footprint, 0.5µA shutdown current, ±0.15 LSB INL over temperature, 1.5MHz small-signal bandwidth, and compatibility with 3V microcontroller serial interfaces without level-shifting.

Technical Context

The MAX1106EUB+ employs a charge-redistribution SAR architecture with an internal auto-zeroed track/hold circuit that acquires signals in ≤1µs and completes conversion in ≤35µs using a 400kHz internal oscillator. Its analog front-end accepts inputs from GND to VDD on IN+ and IN−, with common-mode range GND to VDD and full-scale defined by either internal +2.048V reference or external 1V–VDD reference.

Digital control is implemented via three dedicated pins: CONVST initiates conversion on falling edge after ≥1µs high pulse; SCLK clocks out 8-bit straight-binary data on falling edges at up to 2MHz; SHDN enables 0.5µA power-down mode. The DOUT pin is three-state and high-impedance during shutdown or after all bits are clocked.

Key Specifications

Pinout & Package

The MAX1106EUB+ is housed in a 10-pin µMAX package (3mm × 3mm, 0.8mm height), with exposed pad for thermal enhancement and footprint 20% that of an 8-pin plastic DIP.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit serial ADC applications.

Compared with ADS7822U and TLV1543ID, the MAX1106EUB+ offers the lowest active and shutdown current in a miniature µMAX package, making it optimal for energy-harvested or long-life battery applications where 8-bit resolution is sufficient and board space is premium.

Availability

MAX1106EUB+ is available at Aetrix Electronics and suitable for portable data logging, hand-held measurement devices, and solar-powered remote systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX1106EUB+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, communications, and consumer applications.

The MAX1106EUB+ belongs to Maxim's low-power serial ADC product line, engineered specifically for battery- and energy-harvesting–powered instrumentation where minimal supply current, small footprint, and integrated reference/tracking are critical.

FAQ

What is the operating temperature range for the MAX1106EUB+?

The MAX1106EUB+ is specified for operation from –40°C to +85°C. This extended industrial temperature range ensures reliable performance in outdoor remote sensors, automotive cabin modules, and portable test equipment exposed to wide ambient conditions. All key specifications-including INL, DNL, and supply current-are guaranteed across this full range, and the device uses internal temperature compensation for reference stability (±50ppm/°C tempco).

Can the MAX1106EUB+ operate with an external reference voltage?

Yes, the MAX1106EUB+ supports external reference voltages from 1V to VDD applied directly to the REFIN pin. When using an external reference, the internal REFOUT is disabled, and full-scale conversion corresponds to the applied REFIN voltage. This enables flexible input scaling-for example, a 3.0V reference yields a 0–3.0V unipolar input range. The device maintains ±0.15 LSB INL and 96µA supply current under external reference conditions.

How does the pseudo-differential input mode work on the MAX1106EUB+?

The MAX1106EUB+ implements pseudo-differential input by sampling only IN+, while holding IN− as a stable common-mode reference. During conversion, IN− must remain within ±0.1LSB of GND to maintain accuracy; applying a varying signal to IN− introduces error proportional to its amplitude and frequency. For best results, tie IN− to GND or a clean reference, or bypass it with 0.1µF to ground. True differential input is not supported.

What is the minimum acquisition time required before starting a conversion on the MAX1106EUB+?

The minimum acquisition time (tACQ) for the MAX1106EUB+ is 1µs-guaranteed when the analog source impedance is ≤1kΩ. This time begins immediately after the previous conversion completes and ends with the falling edge of CONVST. If source impedance exceeds 1kΩ, tACQ increases per tACQ = 6(RS + 6.5kΩ) × 18pF, requiring longer inter-conversion delays to avoid missing codes or gain error.

Is the MAX1106EUB+ compatible with standard SPI microcontrollers?

Yes, the MAX1106EUB+ is fully compatible with standard SPI microcontrollers when configured with CPOL = 0 and CPHA = 0. It uses a 3-wire interface (SCLK, DOUT, CONVST) with data clocked on the falling edge of SCLK in MSB-first format. No additional level shifters or interface logic are needed for 3V systems, and the digital inputs accept 3V/5V logic levels regardless of VDD, simplifying integration with mixed-voltage host processors.