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 (±0.7°C accuracy at +25°C), 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 input channels, operates from a single +5V supply, and supports unipolar/bipolar modes for industrial data acquisition and system supervision.

For engineers reviewing the MAX1226BCEE+ datasheet, MAX1226BCEE+ pinout, MAX1226BCEE+ application, or MAX1226BCEE+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated QSOP-16 pin functions, confirmed alternatives with documented functional differences, and supply-chain support for embedded OEM and instrumentation programs.

Technical Context

The MAX1226BCEE+ uses a fully differential successive-approximation register (SAR) architecture with integrated track-and-hold, supporting both single-ended (0 to VREF) and true differential (±VREF/2) inputs. Its internal oscillator enables autonomous scan mode with programmable averaging and AutoShutdown™, reducing host processor overhead in continuous monitoring applications.

It implements a 16-deep FIFO buffer that stores ADC results and temperature measurements separately, allowing burst conversion without serial bus contention. The device always uses its internal reference for temperature sensing and supports external differential reference for voltage conversions - with REF+ and REF− pins configurable as analog inputs when not used for reference.

Key Specifications

Pinout & Package

MAX1226BCEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), RoHS-compliant and lead-free, optimized for automated assembly and thermal performance in industrial PCBs.

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 MAX1226BCEE+ uniquely combines 12-bit accuracy, on-chip temperature sensing, FIFO buffering, and true differential inputs in a 16-pin QSOP - reducing component count and PCB area while enabling autonomous system supervision without external support circuitry.

Availability

MAX1226BCEE+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital signs acquisition, embedded system supervision, and energy metering front-end applications requiring stable component supply and long-term lifecycle assurance.

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) designs precision analog, mixed-signal, and power management ICs for industrial, medical, and communications systems - emphasizing integration, reliability, and low-power operation.

The MAX1226BCEE+ belongs to Maxim's high-accuracy data acquisition product line, engineered specifically for embedded system supervision and multi-sensor monitoring where size, power, and self-contained functionality are critical.

FAQ

What is the operating temperature range for the MAX1226BCEE+?

The MAX1226BCEE+ is specified for commercial-grade operation from 0°C to +70°C, as indicated by the "B" grade suffix and "C" temperature code in its ordering part number. This differs from the extended-range MAX1226BEEE+, which operates from −40°C to +85°C. The MAX1226BCEE+ maintains ±1 LSB INL/DNL and ±0.7°C temperature sensor accuracy across its rated range, making it suitable for indoor industrial and medical equipment where ambient conditions are controlled.

Does the MAX1226BCEE+ require an external reference voltage?

No, the MAX1226BCEE+ includes a factory-trimmed internal 4.096V reference with ±20 ppm/°C temperature coefficient, sufficient for most system supervision and data logging applications. An external differential reference can be applied via REF+ and REF− pins if higher initial accuracy or custom full-scale range is needed, but doing so disables the internal reference and requires external biasing. Temperature measurements always use the internal reference regardless of voltage conversion configuration.

How many analog input channels does the MAX1226BCEE+ support?

The MAX1226BCEE+ supports 8 single-ended analog input channels (AIN0–AIN7) or 4 true differential input pairs (AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, AIN6/AIN7). Channel configuration is software-selectable via the setup register, and each pair can be independently set to unipolar or bipolar mode. Unlike the MAX1228 or MAX1230, the MAX1226BCEE+ does not support channels AIN8–AIN15, limiting its use to lower-channel-count applications.

Can the MAX1226BCEE+ perform simultaneous sampling of multiple channels?

No, the MAX1226BCEE+ uses a single SAR ADC core with a multiplexer and does not support simultaneous sampling. It performs sequential conversions across selected channels in scan mode, with typical inter-channel delay governed by acquisition time (≤0.6µs) and conversion time (≤2.7µs). For true simultaneous sampling, a multi-core ADC like the AD7606 would be required. However, the MAX1226BCEE+'s fast 300ksps rate and FIFO enable tightly timed sequential acquisition suitable for most industrial control loops.

What is the purpose of the CNVST/AIN7 pin on the MAX1226BCEE+?

The CNVST/AIN7 pin on the MAX1226BCEE+ serves a dual function: it acts as either an active-low conversion start trigger or as analog input channel 7, selected via configuration bits in the setup register. When configured as CNVST, it allows hardware-initiated conversions independent of the serial interface - ideal for time-critical events like fault detection. When configured as AIN7, it expands the single-ended input count to eight channels, but disables hardware-triggered sampling capability.