Analog Devices Inc./Maxim Integrated MAX1031BCTI+

Overview

MAX1031BCTI+ from Maxim Integrated is a 10-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±0.7°C accuracy at +25°C), 16-entry FIFO, and internal 2.5V reference. It supports 16 single-ended or 8 true differential analog inputs in unipolar/bipolar modes and operates from a single +3V supply. It is used in industrial control systems for multichannel voltage and temperature monitoring with minimal host interface overhead.

For engineers reviewing the MAX1031BCTI+ datasheet, MAX1031BCTI+ pinout, MAX1031BCTI+ application, or MAX1031BCTI+ equivalent, this page delivers verified electrical specs, TQFN-28 pin mapping, real-world use cases in system supervision and data logging, and two validated alternative ADCs with documented functional trade-offs.

Technical Context

The MAX1031BCTI+ implements a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold, supporting both internally clocked (4.4MHz oscillator ±10%) and externally clocked (up to 10MHz SCLK) conversion modes. Its input stage accepts up to 16 analog channels configurable as single-ended or true differential pairs (e.g., AIN0/AIN1, AIN12/AIN13), with programmable unipolar (0 to VREF) or bipolar (±VREF/2) ranges.

It integrates a dedicated temperature-sensing path using an on-die sensor with 1/8°C resolution and two's complement output, always referenced to its internal 2.5V reference. The 16-deep FIFO buffers conversion results-including temperature-enabling burst acquisition without continuous SPI polling, while AutoShutdown reduces current to 0.2μA during idle periods.

Key Specifications

Pinout & Package

MAX1031BCTI+ is housed in a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP), optimized for thermal performance and board space efficiency in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel, temperature-integrated ADC applications.

Compared with MAX1031BCTI+, ADS8684IPWR trades integrated temperature sensing and FIFO for higher resolution and speed, while AD7928BRUZ offers faster sampling and finer quantization but omits both key system-level features-requiring additional components and firmware complexity to match MAX1031BCTI+'s autonomous multichannel supervision capability.

Availability

MAX1031BCTI+ is available at Aetrix Electronics and suitable for industrial control systems, patient monitoring devices, and environmental data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1031BCTI+ 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 communications applications.

The MAX1027/MAX1029/MAX1031 family was engineered to simplify multichannel data acquisition in space-constrained, low-power systems-integrating FIFO, temperature sensing, and flexible input configuration into a single 3V ADC with robust SPI compatibility.

FAQ

What is the maximum number of analog input channels supported by MAX1031BCTI+?

MAX1031BCTI+ supports up to 16 single-ended analog inputs (AIN0–AIN15) or 8 true differential input pairs (e.g., AIN0/AIN1, AIN12/AIN13). This is the highest channel count in the MAX1027/MAX1029/MAX1031 family-MAX1029 offers 12 single-ended, and MAX1027 offers 8. Channel AIN12 through AIN15 are exclusive to MAX1031BCTI+ and not available on lower variants.

Does MAX1031BCTI+ require an external reference voltage?

No, MAX1031BCTI+ includes a factory-trimmed 2.50V ±10mV internal reference with ±30ppm/°C temperature coefficient, eliminating the need for external reference components in most applications. An external differential reference (applied between REF+ and REF−) can be used instead, supporting input ranges from 1.0V to VDD+50mV on REF+, but the internal reference remains mandatory for temperature measurements.

How does the FIFO function in MAX1031BCTI+ and what is its depth?

The MAX1031BCTI+ contains a 16-entry first-in/first-out (FIFO) buffer that stores complete 10-bit conversion results-each occupying 2 bytes-as well as temperature readings. When enabled, it allows up to 16 voltage conversions plus one temperature measurement to be queued autonomously. If the FIFO overflows, new results overwrite the oldest entries. Data is read out MSB-first via DOUT after each CS falling edge.

What are the supported clock modes for initiating conversions on MAX1031BCTI+?

MAX1031BCTI+ supports four clock modes controlled by CKSEL1 and CKSEL0 bits: Mode 00 (hardware-triggered scan via CNVST), Mode 01 (CNVST-gated single conversion), Mode 10 (serial-interface-initiated scan), and Mode 11 (externally clocked at up to 10MHz SCLK for 300ksps). Mode 11 disables FIFO scanning and averaging but achieves maximum throughput; other modes retain full FIFO and averaging functionality.

Can MAX1031BCTI+ measure temperature and analog voltage simultaneously?

Yes, MAX1031BCTI+ can interleave temperature measurements with analog voltage conversions within the same scan sequence. When the TEMP bit is set in the conversion register, the device inserts one temperature reading into the FIFO after completing the programmed analog channel conversions. The temperature result appears as the first 2-byte word read from the FIFO and is encoded in two's complement format at 1/8°C resolution.