Analog Devices Inc./Maxim Integrated MAX11642EEG+

Overview

MAX11642EEG+ from Maxim Integrated is a 16-channel, 8-bit successive-approximation ADC with integrated track-and-hold, 16-entry FIFO, internal 4.096V reference, and SPI/QSPI/MICROWIRE-compatible serial interface. It operates from a +4.75V to +5.25V supply, achieves up to 300ksps sampling rate with external clocking, and delivers ±1 LSB INL/DNL accuracy over –40°C to +85°C. It is used in industrial control systems for multichannel voltage monitoring of sensors and power rails.

For engineers reviewing the MAX11642EEG+ datasheet, MAX11642EEG+ pinout, MAX11642EEG+ application, or MAX11642EEG+ equivalent, key selection criteria include unipolar 0–VREF input range, 24-pin QSOP package compatibility, FIFO-based burst acquisition capability, and support for internal clock modes (00/01/10) or externally timed conversions (mode 11).

Technical Context

The MAX11642EEG+ employs a SAR architecture with on-chip track-and-hold supporting single-ended analog inputs across 16 channels (AIN0–AIN15). Its internal oscillator (±10% accuracy at 4.4MHz) enables autonomous conversion timing in clock modes 00, 01, and 10, while mode 11 supports externally clocked operation up to 10MHz SCLK for deterministic 300ksps throughput.

It integrates a 16-deep FIFO buffer that stores full 8-bit results (2-byte format, MSB-first), allowing continuous acquisition without serial bus contention. The device supports programmable scan sequences, per-channel averaging (1–8 samples), and configurable CNVST/AIN_ pin functionality - either as active-low conversion trigger or analog input - depending on setup register configuration.

Key Specifications

Pinout & Package

MAX11642EEG+ is housed in a 24-pin QSOP package (5.3mm × 7.2mm, 0.635mm pitch), RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit multichannel ADC applications.

Compared with ADS7822U and MAX11603EEE+, the MAX11642EEG+ uniquely combines 16-channel count, FIFO buffering, and hardware-triggered scan capability in a 5V-compatible 24-pin QSOP - making it optimal for consolidated industrial supervision where channel density and autonomous acquisition outweigh raw resolution needs.

Availability

MAX11642EEG+ is available at Aetrix Electronics and suitable for industrial control systems, patient monitoring devices, and environmental data loggers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX11642EEG+ 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 and mixed-signal ICs for industrial, medical, and communications applications.

The MAX116xx family targets low-power, multichannel data acquisition in space- and cost-constrained systems - emphasizing integrated references, FIFO autonomy, and flexible timing modes to reduce system-level complexity.

FAQ

What is the maximum sampling rate achievable with MAX11642EEG+?

The MAX11642EEG+ achieves up to 300ksps when using externally clocked mode (CKSEL = 11) with SCLK ≤ 10MHz. In internally clocked modes (00/01/10), the effective rate depends on oscillator tolerance (±10%) and conversion overhead; typical sustained throughput is ~270ksps. The MAX11642EEG+ datasheet specifies 300ksps as the guaranteed maximum under defined timing conditions.

Does MAX11642EEG+ require an external reference voltage?

No, the MAX11642EEG+ includes a factory-trimmed internal 4.096V reference with ±20ppm/°C drift, eliminating the need for external reference components. An external reference (1.0V to VDD) may be applied via the REF pin if higher precision or custom scaling is required, but the internal reference is fully functional and optimized for the device's 8-bit architecture.

How does the FIFO buffer in MAX11642EEG+ operate during continuous acquisition?

The MAX11642EEG+ FIFO holds up to 16 full 8-bit conversion results (each stored as two bytes, MSB first). When enabled, it autonomously fills during internal-clock-mode conversions without host interaction. If the FIFO overflows, new results overwrite the oldest entries. Host reads the oldest byte on each CS falling edge; DOUT returns zero when FIFO is empty. This enables burst acquisition independent of serial bus availability.

Can MAX11642EEG+ perform true differential input measurements?

No, the MAX11642EEG+ supports only single-ended analog inputs referenced to GND. Its internal T/H circuit uses a fixed GND-connected negative input capacitor (Figure 3), and all 16 channels (AIN0–AIN15) are unipolar, 0–VREF. Differential measurements require external signal conditioning or a dedicated differential-input ADC such as the MAX11610 series.

What is the function of the CNVST/AIN15 pin on MAX11642EEG+?

The CNVST/AIN15 pin on MAX11642EEG+ is a dual-function terminal: it serves either as analog input channel 15 or as an active-low conversion start trigger, selected via the CKSEL bits in the setup register. In clock mode 01, it acts as a hardware trigger to initiate one-shot conversions; in other modes, it functions as AIN15. Only one role is active at a time - software configuration determines its behavior.