Analog Devices Inc./Maxim Integrated MAX1065AEUI

Overview

MAX1065AEUI from Maxim Integrated is a 14-bit, low-power successive-approximation ADC with parallel interface, internal 4.096V reference, ±1 LSB INL (max), 165 ksps sample rate, and operation over –40°C to +85°C. It serves as the primary analog front-end digitizer in battery-powered data-acquisition systems requiring high accuracy and minimal power.

For engineers reviewing the MAX1065AEUI datasheet, MAX1065AEUI pinout, MAX1065AEUI application, or MAX1065AEUI equivalent, this page delivers verified electrical specs, temperature-rated performance, TSSOP-28 package details, and real-world timing behavior - all confirmed for the exact -40°C to +85°C extended-grade variant.

Technical Context

The MAX1065AEUI implements a SAR architecture with integrated track-and-hold, factory-trimmed 4.096V internal reference (±35 ppm/°C), and automatic power-down via R/C-controlled standby/shutdown modes. Its 14-bit-wide parallel output (D0–D13) interfaces directly with microprocessor buses without external latching.

Conversion is initiated by CS falling edges: first edge powers up and enables acquisition (R/C low), second edge starts conversion, third edge loads data onto the bus (R/C high). Aperture jitter is 100 ps, and full-power bandwidth is 4 MHz - enabling undersampling of signals beyond Nyquist.

Key Specifications

Pinout & Package

MAX1065AEUI is housed in a 28-pin Thin Shrink Small Outline Package (TSSOP), 4.4 mm × 9.7 mm body, 0.65 mm pitch, exposed pad optional. Pin 1 marked with dot; pins numbered counterclockwise.

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 MAX1065AEUI uniquely combines 14-bit accuracy, 165 ksps parallel throughput, integrated 4.096 V reference, and extended temperature rating - reducing BOM count and firmware overhead in high-channel-count, battery-sensitive systems.

Availability

MAX1065AEUI is available at Aetrix Electronics and suitable for industrial process monitoring, automotive sensor hubs, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1065AEUI 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, automotive, and medical applications.

The MAX1065AEUI belongs to Maxim's low-power SAR ADC product line, engineered specifically for high-accuracy, battery-operated data-acquisition systems where integration, temperature resilience, and interface simplicity are critical.

FAQ

What is the maximum sample rate of the MAX1065AEUI, and under what conditions is it guaranteed?

The MAX1065AEUI achieves a maximum sample rate of 165 ksps, guaranteed over its full operating temperature range (–40°C to +85°C) with AVDD = 4.75 V to 5.25 V, DVDD = 2.7 V to 5.25 V, and external or internal reference applied. This rate corresponds to a total conversion time of 4.7 µs from hold-mode entry to EOC assertion, as specified in the timing characteristics table of the official datasheet.

Does the MAX1065AEUI require an external clock source, or does it generate its own conversion clock?

The MAX1065AEUI generates its own internal conversion clock and requires no external clock source. This factory-trimmed clock enables autonomous SAR operation, freeing the host microcontroller from clock generation duties. The device enters acquisition mode on the first CS falling edge and completes conversion in 4.7 µs (max) after the second CS falling edge - all without external timing components.

How does the AutoShutdown™ feature reduce power consumption in the MAX1065AEUI?

AutoShutdown™ reduces the MAX1065AEUI supply current to 0.1 mA when operating at 10 ksps with external reference, and to 0.5 µA in full shutdown mode. This is achieved by powering down the internal reference buffer and analog circuitry between conversions, controlled via the R/C pin during the second CS falling edge - enabling multi-day battery life in duty-cycled sensing applications.

What is the purpose of the REFADJ pin on the MAX1065AEUI, and how is it used in internal vs. external reference configurations?

The REFADJ pin on the MAX1065AEUI serves dual roles: (1) as an adjustment node for fine-tuning the internal 4.096 V reference (±1.5% range via external resistor network), and (2) as the input for external reference injection when tied to AVDD to disable the internal buffer. In external reference mode, REFADJ presents ~5 kΩ input impedance, allowing direct connection to buffered reference sources without additional op-amps.

Can the MAX1065AEUI operate with different analog and digital supply voltages, and what are the valid ranges?

Yes, the MAX1065AEUI supports independent analog and digital supplies: AVDD must be 4.75 V to 5.25 V for proper analog performance, while DVDD operates from 2.7 V to 5.25 V - enabling direct interfacing with 3.3 V or 5 V microcontrollers. The datasheet specifies that AVDD and DVDD may differ, but AGND and DGND must be connected at a single point near the device to prevent ground loop errors.