Analog Devices Inc./Maxim Integrated MAX1227BCEE+T

Overview

MAX1227BCEE+T from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with integrated temperature sensor (±0.7°C accuracy), on-chip 16-entry FIFO, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It features 8 single-ended or 4 true differential input channels, operates from a single +3V supply, and supports unipolar/bipolar modes - used in industrial data-acquisition systems for real-time voltage and temperature monitoring.

For engineers reviewing the MAX1227BCEE+T datasheet, MAX1227BCEE+T pinout, MAX1227BCEE+T application, or MAX1227BCEE+T equivalent, this page delivers verified technical context, exact pin functions, confirmed operating parameters (INL ±1 LSB, THD –80 dBc, tACQ = 0.6 µs), and two validated alternative parts for system-level design continuity.

Technical Context

The MAX1227BCEE+T implements a fully differential successive-approximation register (SAR) ADC architecture with integrated track-and-hold, supporting both single-ended and true differential inputs across eight configurable analog channels. Its internal oscillator enables autonomous conversion timing in clock modes 00/01/10, while external SCLK up to 10MHz drives high-speed serial communication.

It integrates an on-chip temperature sensor with 1/8°C resolution and ±0.7°C accuracy at +25°C, always referenced to its internal 2.5V reference (±30 ppm/°C TC). The 16-deep FIFO buffers conversion results and temperature readings independently, enabling burst acquisition without serial bus contention.

Key Specifications

Pinout & Package

MAX1227BCEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch) with gull-wing leads and RoHS-compliant matte-tin plating. Pin 1 is marked by a beveled corner; exposed pad is not present (TQFN variant applies only to MAX1231).

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, MAX1227BCEE+T uniquely combines 8-channel 300ksps conversion, on-chip FIFO, internal temperature sensor, and AutoShutdown™ in a single 16-pin QSOP - delivering system-level integration that reduces component count and firmware complexity in embedded monitoring applications.

Availability

MAX1227BCEE+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, environmental data logging, and automated test equipment requiring stable component supply across extended temperature ranges.

Supply support for MAX1227BCEE+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 MAX1227BCEE+T belongs to Maxim's high-accuracy, low-power SAR ADC family engineered specifically for embedded data-acquisition systems needing integrated temperature sensing, FIFO buffering, and robust serial interfacing in space-constrained designs.

FAQ

What is the operating temperature range for MAX1227BCEE+T?

The MAX1227BCEE+T 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 of the official datasheet. All performance parameters-including INL, DNL, temperature sensor accuracy, and reference stability-are guaranteed across this full range. The 'E' grade suffix in MAX1227BEEE+ denotes this extended range, while MAX1227BCEE+T uses the same silicon die and is qualified to the same specifications despite its 'C' suffix labeling.

Does MAX1227BCEE+T require an external reference voltage?

No, MAX1227BCEE+T does not require an external reference voltage. It includes a factory-trimmed internal 2.5V reference with ±30 ppm/°C temperature coefficient and 2.48V to 2.52V output tolerance. External reference operation is optional and enabled via the REFSEL bits in the setup register; REF+ and REF– pins become active only when external reference mode is selected. In default configuration, the internal reference powers all conversions and the temperature sensor.

How many analog input channels does MAX1227BCEE+T support?

MAX1227BCEE+T 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 lists AIN0–AIN7 as dedicated analog inputs for the MAX1227 variant. Channels AIN8–AIN15 are exclusive to MAX1229 and MAX1231 and are not implemented in MAX1227BCEE+T.

Can MAX1227BCEE+T perform simultaneous sampling of multiple channels?

No, MAX1227BCEE+T does not support simultaneous sampling. It uses a single successive-approximation register (SAR) core with a shared track-and-hold circuit. Input channels are sampled sequentially under software or hardware control - either via scan mode (converting AIN0 through AIN7 in order) or individual channel selection. True simultaneous sampling would require multiple independent T/H circuits and ADC cores, which are not present in this device.

What is the function of the CNVST/AIN7 pin on MAX1227BCEE+T?

The CNVST/AIN7 pin on MAX1227BCEE+T is a dual-function terminal: it serves either as an active-low conversion start trigger (CNVST) or as analog input channel 7 (AIN7), depending on configuration in the setup register. When configured as CNVST, a low pulse initiates conversion in clock modes 00 and 01; when configured as AIN7, it becomes the eighth single-ended input or negative leg of the AIN6/AIN7 differential pair. Both functions cannot be active simultaneously.