Analog Devices Inc./Maxim Integrated MAX1228AEEP+T

Overview

MAX1228AEEP+T 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, internal 4.096V reference, and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It supports 12 single-ended or 6 true differential analog inputs in unipolar/bipolar modes and operates from a single +5V supply - used in industrial data-acquisition systems requiring synchronized voltage and temperature sampling.

For engineers reviewing the MAX1228AEEP+T datasheet, MAX1228AEEP+T pinout, MAX1228AEEP+T application, or MAX1228AEEP+T equivalent, this page delivers verified specifications, validated QSOP-20 package mapping, confirmed FIFO-based scan/averaging operation, and real-world design context for embedded system integration without external clock dependency.

Technical Context

The MAX1228AEEP+T implements a fully differential successive-approximation register (SAR) ADC architecture with integrated track-and-hold, supporting both single-ended and true differential input configurations. Its internal oscillator enables autonomous conversion timing in clock modes 00, 01, and 10 - eliminating need for external timing control during scan or averaging sequences.

It features configurable channel selection (CHSEL3:CHSEL0), scan mode (SCAN1:SCAN0), and temperature measurement enable (TEMP bit), all controlled via an 8-bit setup register written through its 3-wire serial interface. The device uses two's complement format for bipolar and temperature results, binary for unipolar outputs, and guarantees no missing codes across the full -40°C to +85°C operating range.

Key Specifications

Pinout & Package

MAX1228AEEP+T is housed in a 20-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch) with gull-wing leads. Pin 1 is marked by a beveled corner; exposed pad is absent (unlike TQFN variants).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8325IPW and AD7490BRUZ, the MAX1228AEEP+T uniquely integrates FIFO buffering, hardware scan control, internal reference, and calibrated temperature sensing in a single 20-pin QSOP - reducing firmware overhead, component count, and layout area for embedded data-acquisition systems.

Availability

MAX1228AEEP+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, environmental data loggers, and motor control feedback systems requiring stable component supply across long production lifecycles.

Supply support for MAX1228AEEP+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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.

The MAX1226/MAX1228/MAX1230 family was engineered to simplify high-channel-count data acquisition in space-constrained, low-power systems - integrating FIFO, temperature sensing, and flexible input configuration to replace multi-component solutions.

FAQ

What is the operating temperature range for the MAX1228AEEP+T?

The MAX1228AEEP+T is specified for operation from -40°C to +85°C. This extended temperature range is validated across all electrical parameters including INL, DNL, reference stability, and temperature sensor accuracy - making it suitable for deployment in harsh industrial environments where ambient temperatures exceed commercial-grade limits.

Does the MAX1228AEEP+T require an external crystal or clock source?

No, the MAX1228AEEP+T contains an internal oscillator accurate to ±10% at 4.4MHz, enabling fully autonomous conversions in clock modes 00, 01, and 10. An external clock is optional and only required to achieve the maximum 300ksps sampling rate in clock mode 11 - where SCLK directly controls conversion timing.

How many analog input channels does the MAX1228AEEP+T support in differential mode?

The MAX1228AEEP+T supports six true differential analog input channels: AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, AIN6/AIN7, AIN8/AIN9, and AIN10/AIN11. Each pair shares a common-mode rejection path within the integrated track-and-hold, ensuring accurate differential measurements without external instrumentation amplifiers.

Can the MAX1228AEEP+T perform simultaneous temperature and voltage conversions?

Yes - the MAX1228AEEP+T can interleave temperature measurements with voltage conversions using its FIFO. When the TEMP bit is set in the conversion register, one temperature reading is inserted into the FIFO alongside up to 16 voltage results. Temperature data appears as a 16-bit two's complement value with 1/8°C resolution, stored separately from analog channel data.

What package type is used for the MAX1228AEEP+T?

The MAX1228AEEP+T uses a 20-pin QSOP (Quarter Size Outline Package) with gull-wing leads, measuring 5.3mm × 10.2mm and 0.65mm lead pitch. The "+T" suffix confirms tape-and-reel packaging, and the "E" grade denotes the -40°C to +85°C temperature rating - consistent with the MAX1228BEEP+ ordering code documented in the datasheet.