Analog Devices Inc./Maxim Integrated MAX1032BEUG+

Overview

MAX1032BEUG+ from Maxim Integrated is a 14-bit, 8-channel (single-ended) or 4-channel (true differential) successive-approximation ADC with ±3 × VREF multirange input capability, 115ksps maximum sample rate, ±16.5V overvoltage-tolerant inputs, and internal +4.096V reference. It operates from a single +5V analog supply and supports digital interfacing down to 2.7V via separate DVDDO, enabling use in industrial data-acquisition systems with mixed-voltage microcontrollers.

For engineers reviewing the MAX1032BEUG+ datasheet, MAX1032BEUG+ pinout, MAX1032BEUG+ application, or MAX1032BEUG+ equivalent, key selection considerations include per-channel software-programmable input ranges (seven single-ended, three differential), channel-to-channel isolation >105dB, integral nonlinearity of ±0.25 LSB, and 24-pin TSSOP package compatibility with high-density PCB layouts.

Technical Context

The MAX1032BEUG+ implements a fully differential SAR architecture with integrated track-and-hold, supporting both unipolar and bipolar conversions across programmable voltage spans up to ±12.288V (with VREF = 4.096V). Its analog front-end includes fault-tolerant input protection and independent channel configuration via SPI/QSPI/MICROWIRE-compatible serial interface.

It features four isolated power domains-AVDD1/AGND1 (core analog), AVDD2/AGND2 (preamplifier), DVDD/DGND (digital logic), and DVDDO/DGNDO (I/O)-each with dedicated bypassing requirements. The device supports external clock mode (114ksps), external acquisition mode (84ksps), and internal clock mode (106ksps), with timing controlled by SCLK, CS, DIN, and DOUT signals.

Key Specifications

Pinout & Package

MAX1032BEUG+ is housed in a 24-pin TSSOP (Thin Shrink Small Outline Package) with 0.65mm pitch, optimized for thermal performance and board space efficiency in industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8684IPWR and AD7949BCPZ-RL7, the MAX1032BEUG+ uniquely combines 8-channel flexibility, ±16.5V ruggedness, internal reference, and software-configurable multirange operation in a single 24-pin TSSOP-enabling compact, self-contained analog front-ends without compromise on field reliability or configuration agility.

Availability

MAX1032BEUG+ is available at Aetrix Electronics and suitable for industrial process monitoring, avionics sensor interfaces, and robotics joint control requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX1032BEUG+ 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.

The MAX1032BEUG+ belongs to Maxim's high-accuracy, multirange SAR ADC product line, engineered specifically for ruggedized data-acquisition systems where input flexibility, fault tolerance, and minimal external components are critical design requirements.

FAQ

What is the maximum sample rate achievable with the MAX1032BEUG+ in external clock mode?

The MAX1032BEUG+ achieves a maximum sample rate of 115ksps in external clock mode, as confirmed by electrical characteristics tables and timing diagrams in the official datasheet. This rate is sustained under full-power operation with VAVDD1 = 5V, fCLK = 3.5MHz, and VREF = 4.096V. The device maintains specified INL (±0.25 LSB) and SINAD (84dB) performance at this throughput, making it suitable for high-speed transient capture in motor control and power quality monitoring applications.

Does the MAX1032BEUG+ support true differential input measurements?

Yes, the MAX1032BEUG+ supports true differential input measurements across four channel pairs (CH0–CH1, CH2–CH3, CH4–CH5, CH6–CH7), with three selectable differential ranges: (±3 × VREF)/2, ±3 × VREF, and ±6 × VREF. Each channel pair is independently configurable via the analog input configuration byte, and the device guarantees >105dB channel-to-channel isolation. This capability enables accurate rejection of common-mode noise in bridge sensor and current-shunt applications without external instrumentation amplifiers.

Can the MAX1032BEUG+ operate with a 3.3V digital I/O supply?

Yes, the MAX1032BEUG+ supports DVDDO voltages from 2.7V to 5.25V, allowing direct interface with 3.3V microcontrollers without level-shifting circuitry. The digital interface pins (CS, SCLK, DIN, DOUT, SSTRB) are fully compliant with 3.3V logic thresholds (VIH = 0.7 × DVDDO, VIL = 0.3 × DVDDO), and the device maintains full 14-bit performance and timing specifications across this range. This feature simplifies system integration in mixed-voltage embedded designs.

What is the purpose of the REFCAP pin on the MAX1032BEUG+?

The REFCAP pin on the MAX1032BEUG+ serves as the bandgap-voltage bypass node that determines reference mode selection: connecting REFCAP to AVDD enables external reference operation, while bypassing REFCAP to AGND1 with a 0.01μF capacitor enables internal 4.096V reference operation. The transition occurs between (VAVDD1 − 0.4V) and (VAVDD1 − 0.1V), providing robust mode detection. This dual-mode architecture gives designers flexibility to optimize for accuracy (external reference) or BOM simplicity (internal reference) without changing the MAX1032BEUG+ footprint.

How does the MAX1032BEUG+ handle overvoltage conditions on its analog inputs?

The MAX1032BEUG+ provides ±16.5V overvoltage tolerance on all analog input pins (CH0–CH7) through integrated back-to-back diode protection tied to AVDD1 and AGND1. This protection remains active in all operating modes-including power-down-and does not degrade conversion accuracy or introduce leakage current beyond ±1.25μA. Faults on one channel do not affect conversions on other channels, ensuring reliable operation in harsh industrial environments with potential wiring errors or surge events.