Analog Devices Inc./Maxim Integrated MAX11621EEE+

Overview

The MAX11621EEE+ from Maxim Integrated is a 10-bit, 300ksps serial analog-to-digital converter with integrated 2.5V reference, 8-channel single-ended analog multiplexer, on-chip 16-entry FIFO, and AutoShutdown™. It operates from a +2.7V to +3.6V supply, features SPI/QSPI/MICROWIRE-compatible 3-wire interface, and targets precision data acquisition in space-constrained industrial monitoring systems.

For engineers reviewing the MAX11621EEE+ datasheet, MAX11621EEE+ pinout, MAX11621EEE+ application, or MAX11621EEE+ equivalent, this page delivers verified electrical specs, real-world timing behavior, package-confirmed pin functions, and validated alternative options for system-level ADC selection in embedded sensor interfaces and process control nodes.

Technical Context

This SAR-based ADC integrates a track-and-hold circuit optimized for unipolar 0–VREF input ranges, supports internal clock modes (4.4MHz ±10%) and external clocking up to 10MHz, and implements scan mode with configurable averaging across its 8 analog inputs. Its architecture decouples conversion initiation (via CNVST or serial command) from data readout, enabling burst acquisition without bus contention.

The device uses a dedicated internal reference (2.50V ±20mV, ±30ppm/°C TC) with 200µVRMS noise and -70dB PSRR, and accepts external references from 1V to VDD. Input leakage is ±1µA max, input capacitance is 24pF, and full-linear bandwidth is 100kHz - all specified over -40°C to +85°C.

Key Specifications

Pinout & Package

MAX11621EEE+ is housed in a 16-pin QSOP (5.3mm × 10.2mm, 0.65mm pitch) with exposed pad not electrically connected. Pin functions are validated per Maxim's official pin configuration diagram and functional description.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit multichannel ADC applications.

Compared with ADS7953IRHBT and AD7476ARTZ-REEL7, the MAX11621EEE+ uniquely combines 8-channel multiplexing, on-chip FIFO, internal 2.5V reference, and sub-µA shutdown in a 16-pin QSOP - making it optimal for compact, low-maintenance, multi-sensor embedded systems where integration and power efficiency outweigh raw speed or bit depth.

Availability

MAX11621EEE+ 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 and long-term production continuity.

Supply support for MAX11621EEE+ 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 MAX116xx family was engineered specifically for low-power, multichannel data acquisition in space- and energy-constrained embedded systems - emphasizing integration (FIFO, reference, T/H), ease of µP interfacing, and robust operation across extended temperature ranges.

FAQ

What is the maximum sampling rate achievable with the MAX11621EEE+ using an external clock?

The MAX11621EEE+ achieves a maximum sampling rate of 300ksps when driven by an external clock signal. This rate is confirmed under conditions of fSCLK = 4.8MHz (50% duty cycle), VDD = +3V, and VREF = 2.5V. The device supports external clock frequencies up to 10MHz, but the 300ksps limit arises from internal conversion timing constraints in externally clocked mode (clock mode 11), as documented in the Electrical Characteristics table.

Does the MAX11621EEE+ require an external reference voltage, or does it include an internal one?

The MAX11621EEE+ includes a precision internal 2.50V reference (±20mV, ±30ppm/°C TC) and does not require an external reference. The REF pin can be bypassed with a 0.1µF capacitor to GND to stabilize the internal reference. An external reference from 1.0V to VDD may also be applied to the REF pin if higher accuracy or different full-scale range is needed - but the internal reference is fully functional and production-qualified for standalone operation.

How many analog input channels does the MAX11621EEE+ support, and what is their configuration?

The MAX11621EEE+ supports eight single-ended analog input channels (AIN0–AIN7). One pin (CNVST/AIN7) is dual-function: it serves as either the eighth analog input or as an active-low conversion start trigger, selectable via the setup register. All inputs operate in unipolar mode with a 0–VREF range (0–2.5V when using the internal reference), and share a common GND reference - no differential input capability is provided.

What package type is used for the MAX11621EEE+, and is it RoHS-compliant?

The MAX11621EEE+ is supplied in a 16-pin QSOP package (5.3mm × 10.2mm body, 0.65mm lead pitch) with lead(Pb)-free and RoHS-compliant finish, as indicated by the "+" suffix in the part number. The package includes an exposed pad that is not electrically connected - no thermal or electrical connection is required. Standard QSOP reflow profiles apply, with peak soldering temperature rated at +260°C.

Can the MAX11621EEE+ perform automatic scanning across multiple channels without microcontroller intervention?

Yes, the MAX11621EEE+ supports autonomous scan mode via its internal FIFO and programmable setup register. When configured in clock mode 00 or 01, the device can sequentially convert across user-selected channels (e.g., AIN0–AIN7), store results in the 16-deep FIFO, and assert EOC upon completion - all without serial bus activity. This allows the host µC to initiate acquisition and return later to read accumulated data, minimizing real-time interrupt load in resource-limited systems.