Analog Devices Inc./Maxim Integrated MAX11635EEE+T

Overview

MAX11635EEE+T from Maxim Integrated is a 12-bit, 300ksps successive-approximation ADC with true differential track/hold, internal 2.5V reference, and 4 single-ended / 2 differential input channels. It operates from 2.7V–3.6V, features 16-entry FIFO, scan mode, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. Used in precision industrial data acquisition where low-power, bipolar/unipolar flexibility, and on-chip timing control are required.

For engineers reviewing the MAX11635EEE+T datasheet, MAX11635EEE+T pinout, MAX11635EEE+T application, or MAX11635EEE+T equivalent, this page delivers verified electrical specs, package mapping, functional pin roles, real-world use cases, and validated alternative options - all confirmed against Maxim's official 19-5962 Rev 1 datasheet and ordering guide.

Technical Context

The MAX11635EEE+T implements a fully differential SAR architecture with integrated track-and-hold supporting both unipolar (0 to VREF) and bipolar (±VREF/2) differential modes. Its internal 2.5V reference has ±30ppm/°C drift and 200µVRMS noise, enabling stable conversions without external reference circuitry.

It supports four clock modes via CKSEL bits: externally timed (up to 300ksps), internally timed conversions triggered by CNVST, or serial-interface-initiated acquisitions. The 16-deep FIFO decouples conversion and readout, allowing burst sampling without bus contention.

Key Specifications

Pinout & Package

MAX11635EEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), RoHS-compliant and lead-free (+T suffix). Pin functions are validated per Maxim's Figure 11 pin configuration and Table "Pin Description".

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7953IRHBT and AD7476ARTZ-REEL7, the MAX11635EEE+T uniquely integrates FIFO, differential T/H, internal reference, and AutoShutdown in a 4-channel 300ksps package - reducing component count and firmware complexity for mid-speed industrial and medical DAQ.

Availability

MAX11635EEE+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, and energy metering systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX11635EEE+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 MAX11634–MAX11637 family was engineered for low-power, multichannel data acquisition in space- and power-constrained systems - emphasizing integrated functionality (FIFO, reference, T/H) to minimize external components and simplify layout.

FAQ

What is the maximum sampling rate of the MAX11635EEE+T, and under what conditions is it achieved?

The MAX11635EEE+T achieves a maximum sampling rate of 300ksps when using an external clock in clock mode 11 (CKSEL = 11), with fSCLK ≤ 4.8MHz and 50% duty cycle. This mode disables scan and averaging but enables highest throughput. Internal clock modes limit rate to ~270ksps due to oscillator tolerance.

Does the MAX11635EEE+T require an external reference, or does it have an internal one?

The MAX11635EEE+T includes a factory-trimmed internal 2.50V ±20mV reference with ±30ppm/°C temperature coefficient and 200µVRMS noise. External reference is optional (1V to VDD on REF+) and used only when higher precision or different voltage is required - the internal reference is enabled by default.

How many analog input channels does the MAX11635EEE+T support, and what configurations are available?

The MAX11635EEE+T supports 4 single-ended analog inputs (AIN0–AIN3) or 2 true differential pairs (AIN0/AIN1 and AIN2/AIN3). Configuration is controlled via the setup register; differential mode rejects common-mode noise, while single-ended mode references inputs to GND.

What package type and footprint does the MAX11635EEE+T use, and is it RoHS-compliant?

The MAX11635EEE+T uses a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch) with gull-wing leads. The "+T" suffix confirms lead(Pb)-free and RoHS-compliant construction, qualified per JEDEC standards and suitable for automated SMT assembly.

Can the MAX11635EEE+T operate in low-power or shutdown mode, and what is the typical current draw?

Yes, the MAX11635EEE+T features AutoShutdown™, reducing supply current to ≤5µA in shutdown mode. In active operation at 300ksps with internal reference, typical IDD is 1.2mA (1200µA); with external reference, it drops to ~1.05mA - optimized for battery-powered and energy-efficient designs.