Analog Devices Inc./Maxim Integrated MAX1069ACUD

Overview

MAX1069ACUD from Maxim Integrated is a 14-bit successive-approximation ADC with I²C-compatible 2-wire serial interface, internal +4.096V reference, and 58.6ksps sampling rate. It operates from a single +4.75V to +5.25V analog supply and +2.7V to +5.5V digital supply, consuming only 5mW at full speed. Designed for precision sensing in space-constrained portable systems, it delivers ±1 LSB INL and supports up to 16 devices on one bus via ADD0–ADD3 address pins.

For engineers reviewing the MAX1069ACUD datasheet, MAX1069ACUD pinout, MAX1069ACUD application, or MAX1069ACUD equivalent, this page provides verified technical context, real-world design implications of its AutoShutdown™ power management, I²C fast/high-speed mode timing, unipolar input range configuration, and TSSOP-14 package integration constraints.

Technical Context

The MAX1069ACUD implements SAR architecture with integrated track-and-hold and 4MHz internal clock, enabling deterministic conversion timing without external clocking. Its I²C interface supports both Fast Mode (400kHz) and High-Speed Mode (1.7MHz), with clock stretching during conversion to synchronize master readout.

Analog input uses AGNDS as negative reference and accepts either internal +4.096V reference or external 1V–AVDD reference; digital logic level is independently adjustable via DVDD. The device features separate AVDD/DGND and AVDD/AGND supply domains to minimize noise coupling between analog and digital sections.

Key Specifications

Pinout & Package

MAX1069ACUD is housed in a 14-pin TSSOP (Thin Shrink Small Outline Package) with 0.65mm pitch, optimized for compact PCB layouts and automated assembly. Thermal pad is not present; standard reflow profiles apply.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit I²C ADC applications.

Compared with MAX1069ACUD, ADS1115IRUGT trades speed and integrated reference for PGA flexibility and higher resolution, while MAX1169EUD+ offers drop-in 16-bit upgrade with identical package and interface-making it ideal for resolution-sensitive industrial monitoring where layout change is prohibited.

Availability

MAX1069ACUD is available at Aetrix Electronics and suitable for hand-held portable applications, medical instruments, and battery-powered test equipment requiring stable component supply across commercial temperature range (0°C to +70°C).

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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.

The MAX1069ACUD belongs to Maxim's precision data acquisition product line, designed specifically for low-power, space-constrained systems needing reliable I²C-based 14-bit conversion without external clocks or references.

FAQ

What is the operating temperature range for MAX1069ACUD?

The MAX1069ACUD is rated for commercial temperature operation from 0°C to +70°C, as confirmed in the Ordering Information table. This distinguishes it from the MAX1069AEUD variant (-40°C to +85°C). The 'C' grade suffix in MAX1069ACUD explicitly denotes the 0°C to +70°C range, and all electrical specifications-including INL (±1 LSB), power consumption, and reference accuracy-are guaranteed within this interval.

Does MAX1069ACUD require an external clock source?

No, MAX1069ACUD does not require an external clock source. It integrates a 4MHz internal oscillator that drives the SAR conversion process. The I²C interface clock (SCL) is supplied by the master controller and is used solely for serial communication-not for conversion timing. During conversion, the device stretches SCL low to indicate busy status, eliminating timing dependencies on external clock stability.

How does AutoShutdown™ work in MAX1069ACUD?

In MAX1069ACUD, AutoShutdown™ 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, this reduces analog supply current to less than 50µA. The device wakes instantly upon next I²C start condition-no wake-up delay-making it ideal for burst-mode sensing in energy-harvesting or battery-operated systems.

Can MAX1069ACUD accept an external reference voltage?

Yes, MAX1069ACUD supports external reference voltages from 1V to AVDD. To enable external reference mode, connect REFADJ to AVDD, which disables the internal +4.096V bandgap reference and reference buffer. The external voltage is applied to the REF pin and must be stable and low-noise; typical bypassing uses a 10µF capacitor to AGND. Performance metrics such as INL and SNR remain valid under this configuration.

What is the significance of the ADD0–ADD3 pins on MAX1069ACUD?

The ADD0–ADD3 pins on MAX1069ACUD configure the 4 least-significant bits of the I²C slave address, allowing up to 16 devices to share the same bus. The most-significant 3 bits are factory-fixed to '011'. Each ADDx pin pulled high (DVDD) or low (DGND) sets its corresponding bit-enabling unique addressing without external hardware. This eliminates address collision in multi-sensor nodes, a key feature for compact portable instrumentation using MAX1069ACUD.