Analog Devices Inc./Maxim Integrated MAX11643EEG+T

Overview

MAX11643EEG+T from Maxim Integrated is an 8-bit, 16-channel serial analog-to-digital converter with integrated 2.5V reference, on-chip FIFO, scan mode, internal clock, and AutoShutdown™. It operates from a +2.7V to +3.6V supply, achieves up to 300ksps sampling rate with external clocking, and features ±0.5 LSB INL/DNL accuracy over –40°C to +85°C. It serves in patient monitoring systems where low-power multichannel voltage digitization is required.

For engineers reviewing the MAX11643EEG+T datasheet, MAX11643EEG+T pinout, MAX11643EEG+T application, or MAX11643EEG+T equivalent, key selection criteria include unipolar 0–2.5V input range, 24-pin QSOP package compatibility, SPI/QSPI/MICROWIRE interface timing at ≤10MHz, and FIFO-based burst acquisition without CPU bus contention.

Technical Context

The MAX11643EEG+T implements a successive-approximation register (SAR) architecture with integrated track-and-hold for single-ended inputs. Its internal 2.5V reference exhibits ±30ppm/°C drift and 200µVRMS noise, and it supports both internally timed conversions (via programmable clock modes 00/01/10) and externally clocked operation (mode 11, up to 300ksps).

It uses a 16-entry FIFO to buffer conversion results, enabling autonomous scanning of up to 16 channels without serial bus intervention. The device supports four clock modes via CKSEL bits, allowing flexible control of conversion initiation-either by CNVST pin assertion, internal oscillator, or SCLK edge-while maintaining full 8-bit resolution and no missing codes across temperature.

Key Specifications

Pinout & Package

MAX11643EEG+T is housed in a 24-pin QSOP package (5.3mm × 7.2mm, 0.65mm pitch), RoHS-compliant and lead-free, optimized for high-density PCB layouts with thermal resistance θ_JA = 88°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX11643EEG+T, ADS7822U offers fewer channels and no FIFO but broader supply range, while MAX11624EEE+ matches channel count and reference but lacks FIFO buffering and ultra-low-power shutdown-making MAX11643EEG+T optimal for autonomous, battery-efficient 16-channel acquisition.

Availability

MAX11643EEG+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, and embedded system supervision requiring stable component supply, extended temperature operation, and RoHS-compliant packaging.

Supply support for MAX11643EEG+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX116xx family targets low-power, multichannel data acquisition in space- and energy-constrained systems, emphasizing integrated references, FIFO buffering, and flexible clocking to reduce system-level component count and firmware complexity.

FAQ

What is the maximum sampling rate achievable with MAX11643EEG+T?

The MAX11643EEG+T achieves up to 300ksps when operating in externally clocked mode (CKSEL = 11) with SCLK ≤ 10MHz and proper timing margins. In internally clocked modes (00/01/10), the effective rate is lower due to oscillator tolerance and acquisition overhead; typical sustained throughput in FIFO scan mode is ~100ksps across 16 channels. This rate is confirmed in the Electrical Characteristics table under "Conversion Rate" with f_SCLK = 4.8MHz.

Does MAX11643EEG+T require an external reference voltage?

No, MAX11643EEG+T does not require an external reference voltage because it integrates a precision 2.5V reference with ±0.02V initial accuracy and ±30ppm/°C temperature coefficient. The REF pin can be used as output only; applying an external reference is optional and disables the internal one. This is explicitly stated in the "INTERNAL REFERENCE" section of the datasheet, where V_REF = 2.48V to 2.52V is guaranteed for MAX11643EEG+T.

How many analog input channels does MAX11643EEG+T support?

MAX11643EEG+T supports 16 single-ended analog input channels: AIN0 through AIN14 (pins 1–15), plus AIN15 multiplexed with the CNVST pin (pin 16). This is confirmed in the "Pin Description" table and "Ordering Information" section, which lists MAX11643EEG+T as having "16 INPUTS". The device does not support differential input pairs natively.

What package type is used for MAX11643EEG+T?

MAX11643EEG+T is supplied in a 24-pin QSOP (Quarter-Size Outline Package) with 0.65mm lead pitch, dimensions 5.3mm × 7.2mm, and RoHS-compliant / lead-free finish denoted by the "+T" suffix. This is documented in the "Ordering Information" table and "Pin Configurations" diagram, distinguishing it from the 16-pin QSOP used by the 8-channel MAX11639EEE+T variant.

Can MAX11643EEG+T operate from a 3.3V supply?

Yes, MAX11643EEG+T is fully specified to operate from a +2.7V to +3.6V supply, making 3.3V nominal operation well within its validated range. Electrical characteristics-including INL, DNL, SINAD, and supply current-are guaranteed across this entire range, with typical performance measured at V_DD = 3V and V_REF = 2.5V. This is clearly defined in the "ELECTRICAL CHARACTERISTICS" header and "POWER REQUIREMENTS" table.