Analog Devices Inc./Maxim Integrated MAX11637EEE+

Overview

The MAX11637EEE+ from Maxim Integrated is a 12-bit, 300ksps successive-approximation ADC with true differential track/hold, internal 2.5V reference, 8-channel single-ended / 4-channel differential analog input capability, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It operates from a +2.7V to +3.6V supply and is specified over –40°C to +85°C for industrial data acquisition and system supervision.

For engineers reviewing the MAX11637EEE+ datasheet, MAX11637EEE+ pinout, MAX11637EEE+ application, or MAX11637EEE+ equivalent, key selection considerations include its 16-entry FIFO, internal averaging, AutoShutdown™, ±1 LSB INL/DNL accuracy, and support for unipolar/bipolar differential inputs in compact 16-pin QSOP packaging.

Technical Context

The MAX11637EEE+ implements a fully differential SAR architecture with on-chip track-and-hold, enabling simultaneous sampling of differential pairs (AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, AIN6/AIN7) or eight single-ended channels. Its internal oscillator supports clock modes 00–10, while clock mode 11 enables externally timed conversions up to 300ksps using SCLK ≤ 4.8MHz.

It integrates a 16-word FIFO buffer, scan mode, internal averaging (up to 16 samples), and configurable unipolar/bipolar output coding (binary or two's complement). The device uses an internal 2.5V reference (±30 ppm/°C TC, 200 µVRMS noise) and accepts external references from 1.0V to VDD, with REF+ and REF− pins supporting true differential reference configuration.

Key Specifications

Pinout & Package

Package: 16-pin QSOP (5.3mm × 10.2mm, 0.635mm pitch), RoHS-compliant, lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7957IRHBT and AD7476ARTZ-REEL7, the MAX11637EEE+ offers unique integration of internal 2.5V reference, 16-deep FIFO, AutoShutdown™, and configurable clock modes - reducing BOM count and firmware complexity in multichannel, low-power industrial and medical data acquisition.

Availability

MAX11637EEE+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, and system-level power supervision requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX11637EEE+ 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 applications.

The MAX11634–MAX11637 family was engineered for low-power, multichannel data acquisition in space- and energy-constrained systems requiring high DC accuracy and flexible input configurations without external reference components.

FAQ

What is the internal reference voltage specification for the MAX11637EEE+?

The MAX11637EEE+ features an internal 2.50V reference with ±0.02V initial accuracy (2.48V to 2.52V), ±30 ppm/°C temperature coefficient, and 200 µVRMS output noise. This reference is always used for temperature measurements and can be selected for analog conversions via the setup register, eliminating need for external reference components in most designs.

Does the MAX11637EEE+ support true differential input mode?

Yes, the MAX11637EEE+ supports true differential input mode with four selectable differential pairs: AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, and AIN6/AIN7. In this mode, it rejects common-mode noise and DC offsets, delivering bipolar output in two's complement format with ±VREF/2 input range - critical for precision sensor interfaces like strain gauges and thermocouples.

How many analog input channels does the MAX11637EEE+ provide?

The MAX11637EEE+ provides eight single-ended analog input channels (AIN0–AIN7) or four true differential input channels (AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, AIN6/AIN7). Pins AIN6 and AIN7 are shared with REF− and CNVST functions, respectively, and their analog input role is enabled via configuration in the setup register.

What package type and footprint does the MAX11637EEE+ use?

The MAX11637EEE+ is supplied in a 16-pin QSOP package (5.3mm × 10.2mm body, 0.635mm lead pitch), RoHS-compliant and lead-free. Its pinout is identical across the MAX11634–MAX11637 family, enabling drop-in replacement within same supply voltage and channel count variants - e.g., MAX11636EEE+ (5V supply) shares footprint but differs in reference voltage and supply range.

Can the MAX11637EEE+ operate without an external clock source?

Yes, the MAX11637EEE+ contains an internal oscillator accurate to ±10% of 4.4MHz and supports autonomous conversion in clock modes 00, 01, and 10. In these modes, it requires only CS, DIN, and SCLK for configuration - no external timing circuitry is needed. Clock mode 11 enables externally timed conversions up to 300ksps using SCLK ≤ 4.8MHz.