Analog Devices Inc./Maxim Integrated MAX11636EEE+T

Overview

The MAX11636EEE+T from Maxim Integrated is a 12-bit, 300ksps successive-approximation ADC with true differential track/hold, internal 4.096V reference, and 8 single-ended / 4 differential input channels. It operates from a +4.75V to +5.25V supply, features a 16-entry FIFO, SPI/QSPI/MICROWIRE-compatible 3-wire serial interface, and is specified over –40°C to +85°C for industrial data acquisition systems.

For engineers reviewing the MAX11636EEE+T datasheet, MAX11636EEE+T pinout, MAX11636EEE+T application, or MAX11636EEE+T equivalent, this page delivers verified electrical parameters, confirmed QSOP-16 package mapping, validated channel configuration modes (single-ended/differential), real-world timing behavior (tACQ = 0.6µs, tCONV = 2.7µs), and accurate functional alternatives for system-level design and BOM optimization.

Technical Context

The MAX11636EEE+T implements a fully differential SAR architecture with on-chip track-and-hold supporting both unipolar (0 to VREF) and bipolar (±VREF/2) differential input ranges. Its internal 4.096V reference exhibits ±20ppm/°C drift and 200µVRMS noise, enabling precision measurements without external reference circuitry.

It supports four clock modes via CKSEL bits: mode 00 enables CNVST-triggered conversions with internal timing; mode 11 allows externally clocked sampling up to 300ksps at 4.8MHz SCLK; scan mode and internal averaging are available in modes 00–10. The 16-deep FIFO decouples conversion and readout, reducing µP bus contention.

Key Specifications

Pinout & Package

MAX11636EEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), RoHS-compliant and lead-free (+ suffix). Pin functions are validated per Maxim's official pin description table and functional diagram (Figure 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8688IPWR and AD7928BRUZ, the MAX11636EEE+T offers optimal balance of integrated functionality (reference, FIFO, AutoShutdown), industrial-grade temperature range, and compact QSOP-16 footprint-making it ideal for space-constrained, low-power, and cost-sensitive embedded data acquisition.

Availability

MAX11636EEE+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, automated test equipment, and energy metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX11636EEE+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 industrial, automotive, and communications markets.

The MAX11634–MAX11637 family targets low-power, multichannel data acquisition in space- and power-constrained systems-emphasizing integrated references, flexible timing, and robust noise immunity for harsh environments.

FAQ

What is the maximum sampling rate of the MAX11636EEE+T, and under what conditions is it achieved?

The MAX11636EEE+T achieves a maximum sampling rate of 300ksps when using externally clocked mode (CKSEL = 11) with an SCLK frequency of 4.8MHz and 50% duty cycle. This requires disabling scan mode and internal averaging. At lower clock frequencies or in internally timed modes, the rate drops to 100ksps or less depending on acquisition and conversion timing overhead.

Does the MAX11636EEE+T support true differential input, and how many differential channel pairs are available?

Yes, the MAX11636EEE+T supports true differential input with four configurable pairs: AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, and AIN6/AIN7. Each pair operates with full 12-bit resolution and ±1 LSB linearity. The device also supports 8 single-ended inputs, with AIN6 and AIN7 sharing pins with REF- and CNVST respectively-requiring software configuration to assign function.

What reference voltage options does the MAX11636EEE+T provide, and can they be used simultaneously?

The MAX11636EEE+T integrates a factory-trimmed 4.096V reference (±0.7% initial accuracy, ±20ppm/°C drift) and accepts external references from 1.0V to VDD+50mV on REF+ and 0–500mV on REF-. These cannot be used simultaneously-the internal reference is automatically disabled when REF+ is driven externally. Internal reference is mandatory for temperature sensor operation.

How does the FIFO buffer in the MAX11636EEE+T improve system-level performance?

The 16-entry FIFO in the MAX11636EEE+T allows up to 16 consecutive conversions to complete autonomously while the host µP processes prior data-eliminating bus contention and enabling deterministic sampling intervals. Data is stored as two-byte words (MSB first), and reading empties the oldest entry. Overflow overwrites oldest data, preserving recent measurements in burst scenarios.

Is the MAX11636EEE+T pin-compatible with other members of the MAX11634–MAX11637 family?

Yes, all four variants (MAX11634EEE+T, MAX11635EEE+T, MAX11636EEE+T, MAX11637EEE+T) share identical 16-pin QSOP pinouts and register maps. The only differences are input count (4 vs. 8 channels), supply voltage range (4.75–5.25V vs. 2.7–3.6V), and internal reference voltage (4.096V vs. 2.5V). This enables direct substitution in existing layouts when supply and channel requirements align.