Analog Devices Inc./Maxim Integrated MAX1107EUB+T

Overview

MAX1107EUB+T from Maxim Integrated is a single-supply, low-power, 8-bit serial analog-to-digital converter (ADC) with internal track/hold, +4.096V reference, SPI/QSPI/MICROWIRE-compatible 3-wire interface, and 25ksps conversion rate. It operates from +4.5V to +5.5V, draws only 107µA during conversion, and supports unipolar single-ended or pseudo-differential input configurations. It is used in solar-powered remote systems and 4–20mA industrial sensor interfaces.

For engineers reviewing the MAX1107EUB+T datasheet, MAX1107EUB+T pinout, MAX1107EUB+T application, or MAX1107EUB+T equivalent, key selection criteria include its 10-pin µMAX package, internal 4.096V reference, 0.5µA shutdown current, ±1 LSB DNL, and compatibility with 3V/5V logic microcontrollers without level-shifting.

Technical Context

The MAX1107EUB+T employs a successive-approximation register (SAR) architecture with integrated track/hold and auto-zero rail for single-supply operation. Its analog front-end accepts inputs from GND to VDD and supports pin-selectable configuration between internal reference (REFOUT → REFIN) and external reference (1V to VDD).

Conversion is controlled by CONVST and clocked out via SCLK falling edges on DOUT in MSB-first straight binary format. The internal 400kHz oscillator enables autonomous conversion timing, decoupling the µP from SAR clock generation while supporting up to 2MHz serial data transfer.

Key Specifications

Pinout & Package

MAX1107EUB+T is housed in a 10-pin µMAX package (3.0mm × 3.0mm, 0.8mm height), offering 20% footprint vs. 8-pin DIP and optimized for space-constrained portable and industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX1112CPE+, the MAX1107EUB+T offers optimal trade-off of 5V compatibility, integrated 4.096V reference, ultra-low shutdown current, and minimal footprint-making it ideal for cost-sensitive, space-constrained, single-channel 5V industrial sensors.

Availability

MAX1107EUB+T is available at Aetrix Electronics and suitable for portable data logging, solar-powered remote systems, and 4–20mA-powered remote systems requiring stable component supply and long-term industrial availability.

Supply support for MAX1107EUB+T 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, and communications applications.

The MAX1106/MAX1107 product line targets low-power, single-supply data acquisition in battery- and loop-powered instrumentation where small size, integrated reference, and minimal external components are critical.

FAQ

What is the maximum sampling rate supported by the MAX1107EUB+T?

The MAX1107EUB+T supports a maximum conversion rate of 25ksps under specified conditions (VDD = +4.5V to +5.5V, fSCLK ≤ 2MHz, internal reference). This is guaranteed by the 35µs maximum conversion time (tCONV) and applies across the full −40°C to +85°C operating temperature range. Higher rates may be possible with reduced accuracy or specific input conditions, but 25ksps is the validated, production-tested limit for full specification compliance.

Does the MAX1107EUB+T require an external reference voltage?

No, the MAX1107EUB+T does not require an external reference voltage. It features an internal +4.096V reference accessible at the REFOUT pin. To use it, connect REFOUT directly to REFIN and bypass REFOUT with a 1µF capacitor to GND. External references from 1V to VDD are supported only if higher precision or different scaling is needed.

How does the pseudo-differential input mode work on the MAX1107EUB+T?

In pseudo-differential mode, the MAX1107EUB+T samples only the IN+ input while holding IN− as a stable common-mode reference. IN− must remain within ±0.5LSB of its nominal value (e.g., GND) during conversion; it is not actively differenced. This configuration rejects common-mode noise but does not provide true differential rejection like a fully differential ADC. The full-scale range remains 0V to VREFIN, not VREFIN/2.

What is the purpose of the SHDN pin on the MAX1107EUB+T?

The SHDN pin on the MAX1107EUB+T is an active-low shutdown control that reduces supply current to 0.5µA typical. When pulled low, it powers down the analog biasing circuitry and internal bandgap reference, places DOUT in high-impedance state, and halts any ongoing conversion. After wake-up, a 35µs delay and eight SCLK pulses are required to clear the output register before the next valid conversion.

Can the MAX1107EUB+T interface directly with a 3.3V microcontroller SPI port?

Yes, the MAX1107EUB+T can interface directly with a 3.3V microcontroller SPI port. Its digital inputs (SCLK, CONVST, SHDN) accept logic thresholds compatible with both 3V and 5V systems regardless of VDD, and DOUT outputs CMOS levels referenced to VDD (5V). No level-shifting is required-just ensure the µC's MISO input tolerates 5V, or use a series resistor if necessary per the µC's absolute maximum ratings.