Analog Devices Inc./Maxim Integrated MAX1069ACUD+

Overview

MAX1069ACUD+ from Maxim Integrated is a 14-bit successive-approximation analog-to-digital converter (ADC) with I²C-compatible 2-wire serial interface, internal 4MHz clock, and +4.096V reference. It delivers 58.6ksps sampling rate, ±1 LSB INL accuracy, and operates from +4.75V to +5.25V analog supply while consuming only 5mW at full speed. It serves as a low-power, single-channel precision ADC in battery-constrained sensor monitoring systems.

For engineers reviewing the MAX1069ACUD+ datasheet, MAX1069ACUD+ pinout, MAX1069ACUD+ application, or MAX1069ACUD+ equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for production deployment.

Technical Context

The MAX1069ACUD+ implements SAR architecture with integrated track-and-hold and on-chip 4MHz oscillator, enabling deterministic conversion timing without external clocking. Its unipolar input range scales from 0V to VREF, where VREF may be the internal +4.096V reference or an externally applied voltage from 1V to VAVDD.

It supports both I²C Fast Mode (400kHz) and High-Speed Mode (1.7MHz), with clock stretching during conversion to synchronize data readout. Four address-select pins (ADD0–ADD3) enable up to 16 devices on one bus, and AutoShutdown™ reduces analog supply current to <50µA at 1ksps throughput.

Key Specifications

Pinout & Package

MAX1069ACUD+ is housed in a 14-pin TSSOP package (4.4mm × 5.0mm, 0.65mm pitch), RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit SAR ADC applications.

Compared with ADS7822U, MAX1069ACUD+ offers guaranteed I²C interoperability and built-in reference for faster system integration; versus MAX1169EUD+, it trades 2 bits of resolution for 5.8× higher sampling rate-ideal for time-critical transient capture where 14-bit fidelity meets specification.

Availability

MAX1069ACUD+ is available at Aetrix Electronics and suitable for hand-held portable applications, medical instruments, battery-powered test equipment, solar-powered remote systems, and system supervision requiring stable component supply and long-term manufacturability.

Supply support for MAX1069ACUD+ 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 demanding industrial, medical, and communications applications.

The MAX1069ACUD+ belongs to Maxim's low-power, high-accuracy SAR ADC product line, engineered specifically for space- and energy-constrained systems requiring I²C simplicity, guaranteed linearity, and robust reference integration.

FAQ

What is the guaranteed integral nonlinearity (INL) specification for MAX1069ACUD+?

The MAX1069ACUD+ is the 'A' grade variant, specified with ±1 LSB maximum INL over the full operating temperature range (-40°C to +85°C). This is confirmed in the Ordering Information table and Electrical Characteristics section of the datasheet, and distinguishes it from the MAX1069BEUD+ (±2 LSB). The ±1 LSB guarantee ensures monotonic behavior and supports high-accuracy closed-loop control where code transitions must be strictly predictable.

Does MAX1069ACUD+ support external reference voltage, and what is the valid input range?

Yes, MAX1069ACUD+ supports external reference voltage applied to the REF pin. When REFADJ is tied to AVDD, the internal bandgap reference and buffer are disabled, allowing external references from 1.0V to VAVDD (i.e., up to +5.25V). This mode is explicitly defined in the Electrical Characteristics table under "EXTERNAL REFERENCE" conditions and enables custom full-scale ranges-for example, 2.5V for ratiometric sensor interfaces or 3.3V for direct MCU ADC matching.

How does AutoShutdown™ operate in MAX1069ACUD+, and how much power does it save?

AutoShutdown™ in MAX1069ACUD+ automatically powers down the internal reference and analog circuitry between conversions when the R/W bit is set to '0' in internal reference mode. At 1ksps throughput, analog supply current drops to less than 50µA-reducing total active power from 5mW to ~0.23mW. This behavior is measured and guaranteed in the Electrical Characteristics table under "POWER REQUIREMENTS", making it suitable for ultra-low-duty-cycle battery applications.

Can multiple MAX1069ACUD+ devices share the same I²C bus, and how is addressing managed?

Yes, up to 16 MAX1069ACUD+ devices can coexist on a single I²C bus using hardware address select pins ADD0–ADD3. The first three address bits are factory-fixed to '011', and the last four bits are user-configurable via these pins-enabling unique 7-bit slave addresses without firmware configuration. This is detailed in the "Slave Address" section and Pin Description table, and eliminates software address arbitration overhead in multi-sensor nodes.

What is the maximum achievable sampling rate for MAX1069ACUD+, and what interface mode is required?

The maximum sampling rate for MAX1069ACUD+ is 58.6ksps, and it requires I²C High-Speed Mode (1.7MHz SCL) to achieve this rate. In Fast Mode (400kHz), the maximum throughput is limited to 19ksps due to timing constraints. This distinction is clearly stated in the General Description, Electrical Characteristics (Conversion Rate table), and Bus Timing sections-confirming that HS-mode activation is mandatory for full-speed operation.