Analog Devices Inc./Maxim Integrated MAX1111CEE+T

Overview

MAX1111CEE+T from Maxim Integrated is a low-power, 8-bit, 4-channel analog-to-digital converter (ADC) with integrated track/hold, 2.048V internal reference, SPI/QSPI/MICROWIRE-compatible serial interface, and software-configurable unipolar/bipolar single-ended/differential input modes. It operates from a single 2.7V–5.5V supply and draws only 85µA at 50ksps sampling rate, making it suitable for portable data logging and solar-powered remote sensing systems.

For engineers reviewing the MAX1111CEE+T datasheet, MAX1111CEE+T pinout, MAX1111CEE+T application, or MAX1111CEE+T equivalent, this page delivers verified technical context, confirmed pin functions, real-world use cases in battery-constrained instrumentation, and validated alternative options for multichannel 8-bit ADC selection.

Technical Context

The MAX1111CEE+T employs successive-approximation register (SAR) architecture with an internal track/hold circuit enabling up to 50ksps sampling. Its conversion timing is driven either by an internal 400kHz clock or an external serial clock (50kHz–500kHz), with end-of-conversion signaled via SSTRB output.

Input configuration is fully software-defined via an 8-bit control byte: bits SEL2–SEL0 select among four single-ended channels (CH0–CH3) or two differential pairs (CH0/CH1, CH2/CH3); UNI/BIP and SGL/DIF bits set polarity and input topology; PD1/PD0 enable power-down or clock mode selection.

Key Specifications

Pinout & Package

The MAX1111CEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.635mm pitch), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MCP3204-I/P, the MAX1111CEE+T uniquely combines internal 2.048V reference, bipolar input support, and 6µA software power-down - making it optimal for compact, energy-harvested, and AC/DC-sensing applications where resolution beyond 8 bits is unnecessary.

Availability

MAX1111CEE+T is available at Aetrix Electronics and suitable for portable data logging, hand-held measurement devices, and solar-powered remote systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX1111CEE+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 portable applications.

The MAX1110/MAX1111 family was engineered specifically for ultra-low-power, multichannel data acquisition in space- and energy-constrained systems - emphasizing integrated references, flexible input topologies, and minimal external component count.

FAQ

What is the maximum sampling rate supported by the MAX1111CEE+T?

The MAX1111CEE+T supports up to 50ksps sampling rate when using an external 500kHz serial clock. At this rate, the device consumes 85µA from a 2.7V–5.5V supply. Conversion time is fixed at 10 clock cycles per sample, so lower clock frequencies proportionally reduce throughput - e.g., 100kHz clock yields 10ksps. Internal clock mode operates at ~400kHz and delivers consistent 40ksps performance independent of host timing.

Does the MAX1111CEE+T include an internal voltage reference?

Yes, the MAX1111CEE+T integrates a precision 2.048V bandgap reference with ±0.3% typical accuracy and ±50ppm/°C temperature coefficient. This reference is available at the REFOUT pin and can be used directly at REFIN to set the full-scale input range. A 1µF capacitor is required between REFOUT and AGND for stability. External references from 1V to VDD are also supported for custom scaling.

How many analog input channels does the MAX1111CEE+T support, and what configurations are available?

The MAX1111CEE+T provides four analog input channels (CH0–CH3) configurable as either single-ended inputs referenced to COM, or as two pseudo-differential pairs: CH0/CH1 and CH2/CH3. Configuration is controlled entirely by software via bits SEL2–SEL0 and SGL/DIF in the 8-bit control byte - no hardware changes are needed to switch modes or channels.

What power-saving features does the MAX1111CEE+T offer?

The MAX1111CEE+T offers dual power-saving mechanisms: a software-programmable 2µA automatic power-down mode (reducing supply current to 6µA at 1ksps) and a hardware SHDN pin that forces 10µA shutdown when pulled low. Power-down is automatically exited upon serial interface access. These features enable µA-level average current in duty-cycled applications like periodic sensor polling in remote telemetry nodes.

Is the MAX1111CEE+T compatible with standard microcontroller serial interfaces?

Yes, the MAX1111CEE+T is fully compatible with SPI, QSPI, and MICROWIRE protocols. It uses CPOL = 0 and CPHA = 0 timing - data sampled on SCLK rising edge, shifted out on falling edge. All digital inputs (CS, SCLK, DIN) tolerate voltages up to 5.5V regardless of VDD, allowing direct connection to both 3.3V and 5V microcontrollers without level shifters. The SSTRB output provides interrupt-capable end-of-conversion signaling.