Analog Devices Inc./Maxim Integrated MAX11634EEE+T

Overview

MAX11634EEE+T from Maxim Integrated is a 12-bit, 300ksps serial analog-to-digital converter with true differential track/hold, internal 4.096V reference, and 4 single-ended / 2 differential input channels. It operates from a 4.75V–5.25V supply, features 16-entry FIFO, scan mode, and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It targets precision industrial data acquisition where stable unipolar/bipolar sampling and low-power operation are required.

For engineers reviewing the MAX11634EEE+T datasheet, MAX11634EEE+T pinout, MAX11634EEE+T application, or MAX11634EEE+T equivalent, key selection criteria include its ±1 LSB INL/DNL accuracy over –40°C to +85°C, 73dB SINAD at 30kHz, 1MHz full-power bandwidth, internal reference stability (±20ppm/°C), and QSOP-16 package compatibility with space-constrained sensor front-ends.

Technical Context

The MAX11634EEE+T implements a fully differential successive-approximation register (SAR) architecture with on-chip track-and-hold supporting both unipolar (0 to VREF) and bipolar (±VREF/2) differential inputs. Its internal 4.096V reference is factory-trimmed and exhibits ±20ppm/°C drift over temperature.

Conversion timing is configurable via four clock modes: externally clocked (up to 300ksps), internally timed with CNVST trigger (mode 01), or fully autonomous scan mode (mode 00). The device integrates a 16-deep FIFO to decouple conversion bursts from serial bus latency, enabling continuous sampling without host intervention.

Key Specifications

Pinout & Package

MAX11634EEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for thermal performance (θJA = 105°C/W) and PCB area efficiency in compact industrial sensors and data loggers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and AD7476AARMZ, the MAX11634EEE+T uniquely combines internal 4.096V reference, 16-deep FIFO, and four-clock-mode flexibility-reducing system-level design effort in industrial and medical data acquisition where reliability and integration matter more than peak speed.

Availability

MAX11634EEE+T is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX11634EEE+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) is a semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications systems.

The MAX11634EEE+T belongs to Maxim's precision data acquisition product line, engineered for applications demanding low-noise, high-accuracy ADCs with integrated features-such as internal references, FIFO, and flexible timing-to simplify sensor interface design in harsh environments.

FAQ

What is the internal reference voltage of the MAX11634EEE+T, and how stable is it over temperature?

The MAX11634EEE+T features a factory-trimmed internal reference of 4.096V with ±20ppm/°C temperature coefficient. Over the full –40°C to +85°C operating range, this results in a maximum deviation of ±0.035V, ensuring consistent full-scale scaling without external reference components. This stability is verified across production lots and supports Class 0.5 energy metering and industrial sensor calibration requirements.

Does the MAX11634EEE+T support true differential input mode, and how many differential channels does it provide?

Yes, the MAX11634EEE+T supports true differential input mode using its internal track-and-hold circuitry. It provides two independent differential input channels (e.g., AIN0/AIN1 and AIN2/AIN3), each capable of accepting bipolar (±VREF/2) or unipolar (0 to VREF) signals. Configuration is performed via the setup register, and differential mode inherently rejects common-mode noise-critical for precision measurements in electrically noisy industrial settings.

What are the power consumption characteristics of the MAX11634EEE+T at 300ksps sampling rate?

At 300ksps with internal reference enabled and VDD = 5V, the MAX11634EEE+T draws 2300µA typical supply current (2550µA max). In shutdown mode, current drops to ≤5µA. This low active power-combined with AutoShutdown™-makes it suitable for battery-powered portable instruments. Current scales linearly with sampling rate, allowing predictable power budgeting in energy-constrained designs.

Can the MAX11634EEE+T operate with an external reference, and what is the acceptable input voltage range?

Yes, the MAX11634EEE+T supports external reference inputs via REF+ (pin 9) and REF- (pin 7). REF+ accepts voltages from 1.0V to VDD + 50mV, while REF- operates from 0V to 500mV. When using external reference, the internal 4.096V reference is disabled. This flexibility allows optimization for specific full-scale ranges-for example, 2.5V for legacy systems or 5.0V for maximum dynamic range-without sacrificing accuracy.

How does the 16-entry FIFO in the MAX11634EEE+T improve system-level data acquisition performance?

The 16-entry FIFO in the MAX11634EEE+T buffers conversion results autonomously, allowing up to 16 samples to be acquired and stored without host CPU intervention. This eliminates serial bus contention during burst sampling, reduces interrupt overhead, and enables deterministic timing in real-time control loops. Data is read MSB-first from DOUT after CS assertion, with oldest entries overwritten if FIFO overflows-ideal for transient capture in oscilloscope-like applications.