Analog Devices Inc./Maxim Integrated MAX1065BCUI+

Overview

The MAX1065BCUI+ from Maxim Integrated is a 14-bit, low-power successive-approximation analog-to-digital converter (ADC) with 14-bit-wide parallel interface, 165ksps sampling rate, ±2LSB INL (max), and internal 4.096V reference. It operates from single 4.75V–5.25V analog and 2.7V–5.25V digital supplies, consuming only 2.7mA with internal reference - ideal for high-accuracy, battery-powered data-acquisition systems requiring compact footprint and deterministic timing.

For engineers reviewing the MAX1065BCUI+ datasheet, MAX1065BCUI+ pinout, MAX1065BCUI+ application, or MAX1065BCUI+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The MAX1065BCUI+ implements a SAR architecture with integrated track-and-hold, factory-trimmed 4.096V internal reference (±35ppm/°C), and automatic power-down via R/C-controlled reference buffer enable/disable. Its conversion sequence is fully controlled by CS and R/C edges: first CS fall initiates acquisition, second starts conversion, third loads data - eliminating need for external clock management.

It supports both internal and external reference modes: REFADJ tied to AVDD disables the internal buffer for external reference injection at REF (3.8V–5.25V), while internal mode requires 1µF bypass at REF and 0.1µF at REFADJ. The 28-pin TSSOP package isolates AGND/DGND pins and mandates star-ground layout with separate analog/digital planes.

Key Specifications

Pinout & Package

MAX1065BCUI+ is housed in a 28-pin Thin Shrink Small Outline Package (TSSOP), 4.4mm × 9.7mm body, 0.65mm pitch, with exposed thermal pad (not electrically connected). Pin 1 marked by dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8325IPW and AD7940BRMZ, the MAX1065BCUI+ uniquely combines 14-bit parallel output, 4.096V internal reference, and 165ksps throughput - enabling direct µP integration without level shifters, external references, or serial protocol overhead in cost- and power-sensitive industrial DAQ designs.

Availability

MAX1065BCUI+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, test equipment, and motor control systems requiring stable component supply, long-term lifecycle support, and guaranteed authentic sourcing.

Supply support for MAX1065BCUI+ 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, automotive, and communications applications.

The MAX1065BCUI+ belongs to Maxim's precision data-conversion product line, designed specifically for low-power, high-accuracy, space-constrained data-acquisition systems where deterministic timing and minimal external components are critical.

FAQ

What is the maximum sampling rate of the MAX1065BCUI+ and under what conditions is it guaranteed?

The MAX1065BCUI+ achieves a guaranteed 165ksps sampling rate when operating with AVDD = 4.75V–5.25V, DVDD = 2.7V–5.25V, external reference = 4.096V, CREF = 1µF, CREFADJ = 0.1µF, and TA = 0°C to +70°C. This rate is maintained across the full commercial temperature range and includes all acquisition, conversion, and data-read timing - no derating required for ambient conditions within spec.

How does the MAX1065BCUI+ achieve ±2LSB INL over temperature, and is calibration required?

The MAX1065BCUI+ achieves ±2LSB INL (max) over 0°C to +70°C through factory trimming of its capacitive DAC array and internal reference. No system-level calibration is required - the specification is guaranteed post-assembly and tested across temperature. Layout adherence (separate AGND/DGND, proper bypassing) is essential to maintain this performance in end equipment.

Can the MAX1065BCUI+ operate with an external reference, and what are the voltage and drive requirements?

Yes, the MAX1065BCUI+ supports external reference operation: tie REFADJ to AVDD to disable the internal buffer, then drive REF with a 3.8V–5.25V source capable of supplying ≥100µA DC load and exhibiting ≤10Ω output impedance. For optimal noise performance, buffer the external reference with a low-noise op amp and bypass REF with 1µF ceramic.

What is the function of the R/C pin on the MAX1065BCUI+, and how many distinct operations does it control?

The R/C pin on the MAX1065BCUI+ controls three distinct operations via timing relative to CS falling edges: (1) First CS fall with R/C low initiates acquisition mode; (2) Second CS fall sets standby (R/C low) or shutdown (R/C high) for reference buffer; (3) Third CS fall with R/C high loads conversion result onto D0–D13 bus - enabling full sequencing without external logic.

Does the MAX1065BCUI+ require an external clock, and how is conversion timing managed internally?

No, the MAX1065BCUI+ does not require an external clock. It features a fully integrated, factory-trimmed internal conversion clock. Total conversion time from second CS fall (hold mode entry) to EOC assertion is guaranteed ≤4.7µs - fixed and independent of µP clock speed, simplifying timing-critical real-time systems and eliminating clock distribution noise.