Analog Devices Inc./Maxim Integrated MAX1226ACEE+

Overview

MAX1226ACEE+ from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±1°C accuracy), on-chip 16-entry FIFO, internal 4.096V reference, and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It features 8 single-ended or 4 true differential analog input channels, operates from a single +5V supply, and supports unipolar/bipolar modes - ideal for compact industrial data-acquisition and system supervision circuits.

For engineers reviewing the MAX1226ACEE+ datasheet, MAX1226ACEE+ pinout, MAX1226ACEE+ application, or MAX1226ACEE+ equivalent, this page delivers verified technical context, exact pin functions, real-world use-value per application, and two confirmed alternative parts - all grounded in the official MAX1226/MAX1228/MAX1230 datasheet Rev 2 (July 2004) and Maxim's product documentation.

Technical Context

The MAX1226ACEE+ uses a fully differential successive-approximation register (SAR) architecture with integrated track-and-hold, supporting both single-ended and true differential inputs across its 8-channel analog multiplexer. Its internal oscillator enables autonomous scan mode operation without external timing control.

It integrates a calibrated temperature sensor with 1/8°C resolution and ±1°C error over –40°C to +85°C, always referenced to its internal 4.096V bandgap reference. Conversion results are buffered in a 16-deep FIFO that stores up to 16 ADC outputs plus one temperature reading, enabling burst acquisition without serial bus contention.

Key Specifications

Pinout & Package

MAX1226ACEE+ is packaged in a 16-pin QSOP (5.3mm × 10.2mm, 0.65mm pitch) with gull-wing leads and standard JEDEC MO-137AC footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit multichannel ADC applications.

Compared with ADS7822U and AD7490BRUZ, the MAX1226ACEE+ uniquely combines 300ksps sampling, on-die temperature sensing, and 16-deep FIFO in a 16-pin QSOP - delivering self-contained thermal-aware data acquisition without external support components.

Availability

MAX1226ACEE+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, environmental data loggers, and embedded system supervision requiring stable component supply across extended temperature ranges.

Supply support for MAX1226ACEE+ 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, communications, and computing markets.

The MAX1226ACEE+ belongs to Maxim's precision data-acquisition ADC family designed for space-constrained, low-power applications needing integrated reference, temperature sensing, and autonomous scan capability - targeting system supervision and portable instrumentation.

FAQ

What is the operating temperature range for the MAX1226ACEE+?

The MAX1226ACEE+ is specified for operation from –40°C to +85°C (industrial grade, denoted by 'E' suffix). This range covers most embedded industrial and medical environments. The internal temperature sensor maintains ±1°C accuracy across this full span, and all DC and dynamic specifications - including ±1 LSB INL/DNL and 70dB SINAD - are guaranteed over this temperature range per the official datasheet Rev 2.

Does the MAX1226ACEE+ require an external reference voltage?

No, the MAX1226ACEE+ includes a factory-trimmed 4.096V internal reference with ±1.7% initial accuracy and ±8 ppm/°C temperature coefficient (Grade A). An external differential reference can be used via REF+ and REF– pins, but it is optional. When using the internal reference, no external components are needed - simplifying layout and reducing BOM count. The MAX1226ACEE+ always uses its internal reference for temperature measurements.

How many analog input channels does the MAX1226ACEE+ support?

The MAX1226ACEE+ supports 8 single-ended analog inputs (AIN0–AIN7) or 4 true differential pairs (e.g., AIN0/AIN1, AIN2/AIN3, etc.). Unlike the MAX1228 or MAX1230, it does not support channels AIN8–AIN15. Input configuration - single-ended vs. differential, unipolar vs. bipolar - is controlled entirely via the setup register and requires no hardware changes.

What is the function of the EOC pin on the MAX1226ACEE+?

The EOC (End of Conversion) pin on the MAX1226ACEE+ is an active-low open-drain output that signals when conversion data is ready. In clock modes 00 and 10, EOC goes low after the last requested conversion completes and remains low until the next input byte is clocked in. In clock mode 01, it pulses low after each individual conversion. EOC enables interrupt-driven firmware design, eliminating the need for polling and reducing CPU overhead during high-frequency acquisition.

Can the MAX1226ACEE+ perform simultaneous sampling across multiple channels?

No, the MAX1226ACEE+ does not support simultaneous sampling. It uses a single SAR ADC core with a multiplexer, performing sequential conversions across selected channels. However, its 300ksps maximum rate and 16-entry FIFO allow rapid burst acquisition - e.g., scanning all 8 channels in <27µs - which approximates quasi-simultaneous sampling for signals below ~10kHz bandwidth. True simultaneous sampling requires dedicated multi-core or pipeline ADCs not offered in this family.