Analog Devices Inc./Maxim Integrated MAX1031BCTI+T

Overview

MAX1031BCTI+T from Maxim Integrated is a 10-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±1.2°C error over –40°C to +85°C), 16-entry FIFO, and internal 2.5V reference. It supports 16 single-ended or 8 true differential input channels in unipolar/bipolar modes, operates from a single +3V supply, and interfaces via 10MHz SPI/QSPI/MICROWIRE. It is used in industrial data-acquisition systems requiring multichannel voltage and on-chip temperature monitoring.

For engineers reviewing the MAX1031BCTI+T datasheet, MAX1031BCTI+T pinout, MAX1031BCTI+T application, or MAX1031BCTI+T equivalent, key selection criteria include channel count (16 SE / 8 diff), FIFO depth (16 entries), internal temp sensor accuracy (±1.2°C), ±1 LSB INL/DNL performance, and TQFN-28 package compatibility with high-density PCB layouts.

Technical Context

The MAX1031BCTI+T implements a fully differential successive-approximation register (SAR) ADC 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 analog front-end allows per-channel configuration for single-ended or true differential inputs, with programmable unipolar (0 to VREF) or bipolar (±VREF/2) ranges.

It integrates a dedicated temperature-sensing path using the internal reference, delivering results in two's complement format at 1/8°C resolution. The 16-deep FIFO enables burst acquisition without serial bus contention, and AutoShutdown reduces current to 0.2µA during idle periods - critical for low-power embedded monitoring applications.

Key Specifications

Pinout & Package

MAX1031BCTI+T is housed in a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP), optimized for thermal performance and space-constrained designs. The EP must be soldered to GND for proper operation and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel ADC with temperature sensing applications.

Compared with ADS7953SRHBT and AD7949BCPZ-RL7, the MAX1031BCTI+T uniquely combines 16-channel flexibility, integrated temperature sensing, FIFO buffering, and single-supply 3V operation in a compact TQFN - reducing component count and firmware complexity for embedded monitoring systems.

Availability

MAX1031BCTI+T is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, environmental data logging, and automated test equipment requiring stable component supply and long-term production continuity.

Supply support for MAX1031BCTI+T 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, medical, and communications applications.

The MAX1031BCTI+T belongs to Maxim's precision data-acquisition family, designed specifically for space- and power-constrained systems needing multichannel voltage digitization alongside accurate on-chip thermal monitoring.

FAQ

What is the operating temperature range for the MAX1031BCTI+T?

The MAX1031BCTI+T is specified for operation from –40°C to +85°C. Its internal temperature sensor maintains ±1.2°C accuracy across this full extended temperature range, and all DC and dynamic specifications (including ±1 LSB INL/DNL) are guaranteed within these limits. This makes the MAX1031BCTI+T suitable for harsh industrial and outdoor environments where thermal stability is critical.

Does the MAX1031BCTI+T require an external reference voltage?

No, the MAX1031BCTI+T includes a factory-trimmed internal 2.5V reference (2.48V to 2.52V) with ±30ppm/°C temperature coefficient and 200µVRMS noise. An external differential reference can be used via REF+ and REF− pins, but it is optional. For most applications - especially those requiring minimal BOM count and board area - the internal reference provides sufficient accuracy and stability without external components.

How many analog input channels does the MAX1031BCTI+T support?

The MAX1031BCTI+T supports up to 16 single-ended analog inputs (AIN0–AIN15) or 8 true differential input pairs (e.g., AIN0/AIN1, AIN2/AIN3, ..., AIN14/AIN15). Channels AIN12–AIN15 are exclusive to the MAX1031 family and are not available on MAX1027/MAX1029. All inputs are software-configurable for unipolar or bipolar operation and can be scanned automatically in sequence using the built-in FIFO and scan modes.

What package type is used for the MAX1031BCTI+T?

The MAX1031BCTI+T is supplied in a 28-pin, 5mm × 5mm TQFN package with exposed pad (EP). This RoHS-compliant, lead-free package provides excellent thermal performance and compact footprint - ideal for high-density PCBs in portable and industrial equipment. The exposed pad must be soldered to a GND plane for proper electrical and thermal operation.

Can the MAX1031BCTI+T perform simultaneous sampling across multiple channels?

No, the MAX1031BCTI+T uses a single SAR ADC core with a multiplexed input structure and does not support true simultaneous sampling. It performs sequential conversions across selected channels using its internal track-and-hold and FIFO. However, its 300ksps maximum rate and 16-deep FIFO enable rapid burst acquisition - effectively capturing tightly timed multi-channel snapshots with minimal inter-channel skew when used with appropriate external signal conditioning.