Analog Devices Inc./Maxim Integrated MAX1226BCEE

Overview

MAX1226BCEE from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±1.2°C error over -40°C to +85°C), on-chip 16-entry FIFO, and internal 4.096V reference. It features 8 single-ended or 4 true differential input channels, SPI/QSPI/MICROWIRE-compatible 3-wire interface, and operates from a single +5V supply. It is used in industrial data-acquisition systems requiring simultaneous voltage and temperature monitoring with low-power, compact footprint.

For engineers reviewing the MAX1226BCEE datasheet, MAX1226BCEE pinout, MAX1226BCEE application, or MAX1226BCEE equivalent, this page delivers verified technical context, exact pin functions for the 16-pin QSOP package, real-world use cases in system supervision and patient monitoring, and two validated alternative parts with documented functional and packaging differences.

Technical Context

The MAX1226BCEE implements a fully differential successive-approximation register (SAR) ADC architecture with integrated track-and-hold, supporting both unipolar (0 to VREF) and bipolar (±VREF/2) differential modes. Its internal oscillator enables autonomous scan mode at up to 300ksps with programmable averaging and FIFO buffering.

It integrates an on-die temperature sensor with 1/8°C resolution and ±1.2°C accuracy across -40°C to +85°C, always referenced to its internal 4.096V reference. The 3-wire serial interface supports clock polarity/phase flexibility (CPOL = CPHA = 0 or 1) and outputs data in binary (unipolar) or two's complement (bipolar/temperature) format.

Key Specifications

Pinout & Package

MAX1226BCEE is housed in a 16-pin QSOP (Quarter Size Outline Package) with 0.65mm lead pitch and standard JEDEC MO-137AC footprint. The package is RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel SAR ADC applications.

Compared with MAX1226BCEE, ADS8325IPW trades integrated functionality for higher resolution and AD7923BRUZ sacrifices FIFO and thermal sensing for simpler interface and lower cost - neither offers the same combination of 300ksps, on-chip FIFO, internal reference, and calibrated temperature sensor in a 16-pin QSOP.

Availability

MAX1226BCEE is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, embedded system supervision, and environmental data logging requiring stable component supply across extended temperature ranges.

Supply support for MAX1226BCEE 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 MAX1226BCEE belongs to Maxim's precision data-acquisition ADC family, designed specifically for space-constrained, low-power systems needing simultaneous analog voltage and on-die temperature measurement without external support components.

FAQ

What is the operating temperature range for the MAX1226BCEE?

The MAX1226BCEE is specified for operation from -40°C to +85°C. This extended industrial temperature range is confirmed in the Ordering Information table and Electrical Characteristics section, where all DC and dynamic parameters are guaranteed across this span. The internal temperature sensor maintains ±1.2°C accuracy within this range, making MAX1226BCEE suitable for harsh-environment deployments like factory floors and outdoor instrumentation.

Does the MAX1226BCEE require an external reference voltage?

No, the MAX1226BCEE does not require an external reference voltage. It includes a factory-trimmed internal 4.096V reference with ±20 ppm/°C temperature coefficient and 200µVRMS noise. External reference operation is optional and supported via REF+ and REF- pins, but the internal reference is fully functional for all conversions and mandatory for temperature measurements. MAX1226BCEE achieves ±1 LSB INL using its internal reference across the full temperature range.

How many analog input channels does the MAX1226BCEE support?

The MAX1226BCEE supports 8 single-ended analog input channels (AIN0 through AIN7) or 4 true differential input pairs (AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, AIN6/AIN7). This is explicitly stated in the General Description and confirmed in the Pin Description table, which shows AIN0–AIN7 as dedicated inputs and identifies REF-/AIN6 and CNVST/AIN7 as dual-function pins usable as analog inputs when not assigned to reference or conversion-start roles.

What communication interface does the MAX1226BCEE use?

The MAX1226BCEE uses a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface with pins CS, SCLK, DIN, and DOUT. It supports CPOL = CPHA = 0 or 1, operates up to 10MHz SCLK, and outputs data MSB-first on the falling edge of SCLK. The interface is fully documented in the "3-Wire Serial Interface" section and timing diagrams, confirming compatibility with standard microcontroller SPI peripherals without protocol translation.

Is the MAX1226BCEE pin-compatible with other devices in the MAX1226/MAX1228/MAX1230 family?

No, the MAX1226BCEE is not pin-compatible with MAX1228 or MAX1230 variants. While all three share the same functional architecture, MAX1226BCEE uses a 16-pin QSOP package with only AIN0–AIN7 exposed, whereas MAX1228 uses a 20-pin QSOP (adding AIN8–AIN11) and MAX1230 uses 24-pin QSOP or 28-pin QFN (adding AIN8–AIN15). Pin mappings for shared signals (e.g., REF+, GND, VDD) align, but channel count and pin count differ - making direct PCB substitution impossible without layout revision.