Analog Devices Inc./Maxim Integrated MAX1069BEUD+

Overview

MAX1069BEUD+ from Maxim Integrated is a 14-bit, 58.6ksps successive-approximation analog-to-digital converter (ADC) with I²C-compatible 2-wire serial interface, internal 4MHz clock, and +4.096V reference. It operates from a single +4.75V to +5.25V analog supply and supports digital logic levels from +2.7V to +5.5V. Designed for low-power unipolar signal digitization in battery-powered instrumentation and remote sensing systems.

For engineers reviewing the MAX1069BEUD+ datasheet, MAX1069BEUD+ pinout, MAX1069BEUD+ application, or MAX1069BEUD+ equivalent, this page delivers verified electrical specifications, temperature-stable INL (±2 LSB), AutoShutdown™ power management, and TSSOP-14 package integration guidance for portable medical, solar-powered, and system supervision designs.

Technical Context

The MAX1069BEUD+ implements SAR architecture with integrated track-and-hold and switched-capacitor DAC, using its internal 4MHz oscillator to drive conversion timing. It performs unipolar conversions on a single analog input (AIN), with full-scale range set by either the internal +4.096V reference or an external reference from 1V to VAVDD.

Its I²C interface supports both Fast Mode (400kHz) and High-Speed Mode (1.7MHz), with clock stretching during conversion. Four address-select pins (ADD0–ADD3) enable up to 16 devices on one bus, and separate AVDD/DVDD supplies isolate analog noise from digital switching transients.

Key Specifications

Pinout & Package

MAX1069BEUD+ is housed in a 14-pin TSSOP (Thin Shrink Small Outline Package) with 0.65mm pitch, RoHS-compliant and lead(Pb)-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U, MAX1069BEUD+ provides guaranteed I²C compatibility and integrated reference, simplifying design; versus MAX1169BEUD+, it trades 2 bits of resolution for lower power and cost while retaining identical footprint and software interface.

Availability

MAX1069BEUD+ is available at Aetrix Electronics and suitable for hand-held portable applications, medical instruments, and battery-powered test equipment requiring stable component supply across extended temperature ranges (−40°C to +85°C).

Supply support for MAX1069BEUD+ 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 automotive applications.

The MAX1069BEUD+ belongs to Maxim's low-power SAR ADC product line, engineered for high-accuracy, low-quiescent-current digitization in resource-constrained portable and remote systems.

FAQ

What is the maximum sampling rate supported by the MAX1069BEUD+?

The MAX1069BEUD+ achieves a maximum sampling rate of 58.6ksps in I²C High-Speed Mode (1.7MHz SCL). This requires proper bus timing compliance and low-source-impedance analog input (<2.4kΩ). In Fast Mode (400kHz), the throughput drops to 19ksps. The internal 4MHz clock drives conversion independently of SCL frequency, ensuring consistent timing accuracy regardless of bus speed.

Does the MAX1069BEUD+ require an external reference voltage?

No, the MAX1069BEUD+ includes a factory-trimmed +4.096V internal reference with ±35ppm/°C temperature coefficient and 10µF bypass requirement on REF. An external reference (1V to VAVDD) may be used by pulling REFADJ to AVDD, disabling the internal bandgap. Using the internal reference simplifies design and reduces BOM count, while external referencing enables custom full-scale scaling.

How does AutoShutdown™ operate in the MAX1069BEUD+?

AutoShutdown™ powers down internal circuitry-including the reference and oscillator-between conversions when the R/W bit is set to 0 in internal reference mode. At 1ksps throughput, supply current drops below 50µA; in shutdown state, analog supply current falls to 0.4µA. This feature is transparent to the host I²C controller and requires no configuration registers-activation is controlled solely by the R/W bit in the slave address byte.

Can multiple MAX1069BEUD+ devices share the same I²C bus?

Yes, up to 16 MAX1069BEUD+ devices can coexist on one I²C bus using the four address-select pins (ADD0–ADD3). Each pin configures one LSB of the 7-bit slave address (MSBs fixed as 011), yielding addresses from 0x68 to 0x77. No external address translation or bus arbitration logic is needed-the devices respond only to their assigned address, enabling scalable sensor networks.

What is the analog input voltage range specification for the MAX1069BEUD+?

The MAX1069BEUD+ accepts a unipolar analog input (AIN) from 0V to VREF, where VREF is either the internal +4.096V or an externally applied voltage from 1V to VAVDD. Input protection diodes clamp AIN to AGNDS −0.3V and AVDD +0.3V, but accurate conversion requires staying within AGNDS to VREF ±50mV. Exceeding rails by >300mV requires current limiting to ≤2mA.