Analog Devices Inc./Maxim Integrated MAX1302AEUG+

Overview

The MAX1302AEUG+ from Maxim Integrated is a 16-bit successive-approximation analog-to-digital converter (ADC) with eight single-ended or four differential analog input channels, ±6V overvoltage-tolerant inputs, software-programmable multirange operation (±VREF/4 to ±2×VREF), and 115ksps maximum throughput. It operates from a single +5V analog supply and supports digital interfacing at 2.7V–5.25V via SPI/QSPI/MICROWIRE-compatible serial interface, targeting industrial data-acquisition systems requiring high-resolution, multichannel, fault-tolerant sensing.

For engineers reviewing the MAX1302AEUG+ datasheet, MAX1302AEUG+ pinout, MAX1302AEUG+ application, or MAX1302AEUG+ equivalent, this page delivers verified specifications, package mapping, channel configuration logic, reference architecture (internal +4.096V or external 3.800V–4.136V), and real-world design implications for multirange bipolar acquisition in noisy environments.

Technical Context

The MAX1302AEUG+ implements a fully differential SAR architecture with integrated track-and-hold, supporting independent per-channel configuration of unipolar and bipolar input ranges via an 8-bit analog input configuration byte. Its dual analog supplies (AVDD1, AVDD2) isolate preamplifier and core ADC circuitry to minimize noise coupling.

It features three distinct operating modes-external clock, internal clock, and external acquisition-with configurable power states: full power-down (1µA typ), partial power-down (1.3mA typ), and active conversion (total supply current ≤24.5mA typ). Input common-mode voltage range spans –4.75V to +5.50V in differential mode, enabling direct connection to industrial transducers without external level-shifting.

Key Specifications

Pinout & Package

MAX1302AEUG+ is housed in a 24-pin TSSOP package (4.4mm × 7.8mm, 0.65mm pitch), optimized for compact industrial PCB layouts with thermal and noise isolation between analog and digital sections.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multirange 16-bit SAR ADC applications.

Compared with AD7606BSTZ and ADS8688IPWR, the MAX1302AEUG+ uniquely combines per-channel software-configurable input ranges, ±6V fault tolerance, and an integrated +4.096V reference in a low-power 24-pin TSSOP-making it optimal for space-constrained, mixed-signal industrial nodes where flexibility, robustness, and component count reduction are prioritized over raw speed or parallel interface bandwidth.

Availability

MAX1302AEUG+ is available at Aetrix Electronics and suitable for industrial control systems, data-acquisition modules, avionics sensor interfaces, and robotics joint feedback circuits requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for MAX1302AEUG+ 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications, emphasizing low-noise performance, high reliability, and integration density.

The MAX1302AEUG+ belongs to Maxim's multirange SAR ADC product line, engineered specifically for industrial data acquisition where sensor signal diversity, field robustness, and system-level BOM optimization are critical design constraints.

FAQ

What is the guaranteed integral nonlinearity (INL) specification for MAX1302AEUG+?

The MAX1302AEUG+ is the 'A' grade variant, specified with ±1.0 LSB typical and ±2 LSB maximum integral nonlinearity over temperature. This tighter INL spec ensures superior code-to-code monotonicity and end-point accuracy compared to the MAX1302BEUG+ (±4 LSB max), making it preferred for closed-loop control and metrology-grade measurements where transfer function fidelity is critical.

Does MAX1302AEUG+ support both internal and external reference configurations simultaneously?

No, the MAX1302AEUG+ operates exclusively in either internal or external reference mode, selected by the voltage applied to the REFCAP pin. If REFCAP is held below (AVDD1 – 0.4V), the internal +4.096V reference is enabled; if above (AVDD1 – 0.1V), the device uses the external voltage applied to REF. Both modes cannot be active concurrently, and switching requires power-cycle or reset sequence.

How does the ±6V overvoltage tolerance on MAX1302AEUG+ analog inputs function in practice?

The ±6V tolerance on CH0–CH7 is implemented via integrated back-to-back diodes tied to AVDD1 and AGND1. During overvoltage events, current is shunted through these diodes without damaging the input structure. This allows direct connection to industrial field wiring without external protection components-provided input current remains within ±50mA absolute maximum rating and sustained overvoltage does not exceed 6V beyond the supply rails.

Can MAX1302AEUG+ perform simultaneous sampling across all eight channels?

No, the MAX1302AEUG+ performs sequential sampling using a single SAR core and internal multiplexer. While it supports rapid channel scanning (up to 115ksps aggregate rate), true simultaneous sampling requires external sample-and-hold circuitry. The device does provide channel-to-channel isolation >105dB, minimizing crosstalk during sequential acquisition of closely spaced signals.

What is the minimum digital I/O supply voltage (DVDDO) required for reliable SPI communication with MAX1302AEUG+?

The MAX1302AEUG+ supports DVDDO from 2.7V to 5.25V. For reliable SPI communication, DVDDO must be ≥2.7V to meet VIH ≥0.7×VDVDDO and VIL ≤0.3×VDVDDO thresholds. At 2.7V, VIH = 1.89V and VIL = 0.81V-ensuring compatibility with 3.3V and 5V microcontrollers without level translation, provided timing margins (e.g., tDS ≥40ns) are maintained.