Analog Devices Inc./Maxim Integrated MAX11629EEE+

Overview

MAX11629EEE+ from Maxim Integrated is a 12-bit, 8-channel, single-ended SAR analog-to-digital converter with internal 2.5V reference, 16-entry FIFO, and SPI/QSPI/MICROWIRE-compatible serial interface. It operates from a +2.7V to +3.6V supply, achieves up to 300ksps sampling rate with external clock, and features AutoShutdown™, scan mode, and internal averaging. It is used in patient monitoring systems for high-accuracy, low-power analog signal digitization.

For engineers reviewing the MAX11629EEE+ datasheet, MAX11629EEE+ pinout, MAX11629EEE+ application, or MAX11629EEE+ equivalent, key selection considerations include its 8-channel count, 2.5V internal reference voltage, ±1 LSB INL/DNL accuracy over –40°C to +85°C, unipolar 0–VREF input range, and QSOP-16 package compatibility with space-constrained medical and industrial data-acquisition designs.

Technical Context

The MAX11629EEE+ employs a successive-approximation register (SAR) architecture with integrated track-and-hold, supporting unipolar single-ended inputs referenced to GND. Its internal 2.5V reference has ±30ppm/°C temperature coefficient and 200µV_RMS noise, enabling stable conversions without external precision references.

It supports four clock modes via CKSEL bits: internally timed conversions (modes 00/01/10) using its 4.4MHz ±10% oscillator, or externally clocked acquisition (mode 11) at up to 4.8MHz SCLK for full 300ksps throughput. The 16-deep FIFO decouples conversion and readout, reducing host processor overhead in burst-sampling applications.

Key Specifications

Pinout & Package

MAX11629EEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), optimized for automated assembly and thermal performance in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7957IRHBT and AD7476AWYRMZ-RL7, the MAX11629EEE+ uniquely integrates an internal 2.5V reference, 16-deep FIFO, and 8-channel mux in a single QSOP-16 package-reducing system-level component count, layout area, and firmware complexity for medium-speed, multi-sensor data acquisition.

Availability

MAX11629EEE+ is available at Aetrix Electronics and suitable for system supervision, patient monitoring, data logging, and industrial control systems requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for MAX11629EEE+ 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 MAX11629EEE+ belongs to the MAX11626–MAX11633 family of low-power, multichannel SAR ADCs engineered for system monitoring and instrumentation where integration, accuracy, and ease of µC interfacing are critical.

FAQ

What is the internal reference voltage of the MAX11629EEE+?

The MAX11629EEE+ features a factory-trimmed internal reference voltage of 2.50V ±20mV (typical 2.50V, min 2.48V, max 2.52V) with ±30ppm/°C temperature coefficient. This reference is enabled by default and eliminates the need for an external precision voltage source in most applications. The MAX11629EEE+ does not support disabling the internal reference; it can be overridden only by applying a valid external reference (1V to VDD) to the REF pin.

How many analog input channels does the MAX11629EEE+ support?

The MAX11629EEE+ supports exactly 8 single-ended analog input channels (AIN0 through AIN7). AIN7 is configurable as either the eighth analog input or as an active-low conversion start (CNVST) signal, depending on setup register programming. Unlike the MAX11632/MAX11633 (16-channel) or MAX11626/MAX11627 (4-channel), the MAX11629EEE+ is specifically designed for 8-channel multiplexed data acquisition.

What package type is used for the MAX11629EEE+?

The MAX11629EEE+ is supplied in a 16-pin QSOP (Quarter-Size Outline Package) with lead (Pb)-free/RoHS-compliant finish. Its dimensions are 10.2mm × 5.3mm × 1.75mm, and it uses a 0.635mm pin pitch. This surface-mount package is compatible with standard reflow soldering processes and supports high-density PCB layouts typical in medical and industrial equipment.

Does the MAX11629EEE+ include a FIFO buffer, and how is it used?

Yes, the MAX11629EEE+ includes a 16-entry first-in/first-out (FIFO) buffer that stores complete 12-bit conversion results (each occupying two bytes). When configured for scan mode or internal clocking, the ADC autonomously fills the FIFO without host intervention. The oldest result is shifted out on DOUT after each CS falling edge, enabling burst readout and reducing serial bus occupancy. If the FIFO overflows, new results overwrite the oldest entries.

What is the maximum sampling rate achievable with the MAX11629EEE+?

The MAX11629EEE+ achieves a maximum sampling rate of 300ksps when operated in externally clocked mode (CKSEL1/CKSEL0 = 11) with an SCLK frequency of 4.8MHz. In internally clocked modes (00, 01, 10), the effective sampling rate is lower due to oscillator tolerance (±10%) and added overhead from FIFO management and register access; typical sustained rates are ~270ksps. The 300ksps figure assumes unidirectional, non-averaged, single-channel operation with minimal inter-conversion delay.