Analog Devices Inc./Maxim Integrated MAX1111EEE/V+T

Overview

MAX1111EEE/V+T from Maxim Integrated is a low-power, 4-channel single-ended or 2-channel differential 8-bit successive-approximation ADC with internal track/hold, 2.048V reference, SPI/QSPI/MICROWIRE-compatible serial interface, and software-configurable unipolar/bipolar operation. It operates from 2.7V to 5.5V, consumes 85µA at 50ksps, and targets portable data loggers and hand-held measurement devices.

For engineers reviewing the MAX1111EEE/V+T datasheet, MAX1111EEE/V+T pinout, MAX1111EEE/V+T application, or MAX1111EEE/V+T equivalent, key selection criteria include its 16-pin QSOP package, 50ksps sampling rate with ±1 LSB total unadjusted error, internal reference stability, and SHDN-controlled power-down mode reducing supply current to 6µA at 1ksps.

Technical Context

The MAX1111EEE/V+T uses a capacitive DAC-based successive-approximation architecture with integrated track/hold circuitry, supporting both internal (2.048V) and external reference inputs (1V to VDD). Its analog input multiplexer enables software-selectable single-ended (CH0–CH3) or pseudo-differential (CH0/CH1, CH2/CH3) configurations via an 8-bit control byte.

Conversion timing is governed by either an internal clock (~400kHz) or external serial clock (50kHz–2MHz), with SSTRB providing end-of-conversion strobe signaling. The device features 1µs track/hold acquisition time, 1.5MHz small-signal bandwidth, and ±0.5 LSB offset error over temperature (–40°C to +85°C).

Key Specifications

Pinout & Package

The MAX1111EEE/V+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for space-constrained portable instrumentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MCP3004-I/P, the MAX1111EEE/V+T offers optimal trade-off of ultra-low power (85µA), integrated 2.048V reference, and software-configurable input modes in a compact 16-pin QSOP-making it uniquely suited for long-life, space-constrained, battery-operated measurement systems.

Availability

MAX1111EEE/V+T is available at Aetrix Electronics and suitable for portable data logging, hand-held instrumentation, and solar-powered remote sensing requiring stable component supply and guaranteed long-term availability.

Supply support for MAX1111EEE/V+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 MAX1111EEE/V+T belongs to Maxim's low-power serial ADC product line, engineered specifically for battery-operated measurement systems requiring high integration, minimal external components, and guaranteed performance across –40°C to +85°C.

FAQ

What is the operating temperature range for the MAX1111EEE/V+T?

The MAX1111EEE/V+T is rated for operation from –40°C to +85°C. This extended industrial temperature range is validated per Maxim's datasheet specifications and ensures reliable performance in outdoor telemetry units, medical handhelds, and factory-floor diagnostics equipment where ambient conditions vary widely. All key parameters-including total unadjusted error, offset drift, and reference stability-are guaranteed across this full range.

Does the MAX1111EEE/V+T require an external reference voltage?

No, the MAX1111EEE/V+T does not require an external reference voltage because it integrates a precise 2.048V internal reference (REFOUT), specified at ±0.3% typical accuracy. REFOUT is accessible on Pin 7 and must be bypassed with a 1µF capacitor to AGND. An external reference (1V to VDD) may be applied to REFIN (Pin 6) for custom full-scale ranges, but it is optional-not required-for standard operation.

How many analog input channels does the MAX1111EEE/V+T support?

The MAX1111EEE/V+T supports four single-ended analog inputs (CH0–CH3) or two pseudo-differential input pairs (CH0/CH1 and CH2/CH3), as configured via the SGL/DIF bit in the 8-bit control byte. Unlike the MAX1110 (8-channel), the MAX1111EEE/V+T is specifically designed for compact 4-input applications-confirmed by its 16-pin QSOP footprint and functional diagrams in the official datasheet.

What serial interface standards is the MAX1111EEE/V+T compatible with?

The MAX1111EEE/V+T supports SPI, QSPI, and MICROWIRE serial interface standards through its 4-wire synchronous protocol (CS, SCLK, DIN, DOUT). It requires CPOL = 0 and CPHA = 0 for SPI compatibility and transmits/receives data MSB-first. All digital inputs (CS, SCLK, DIN) tolerate voltages up to 5.5V independent of VDD, enabling seamless interfacing with both 3V and 5V microcontrollers without level shifters.

Can the MAX1111EEE/V+T operate in power-down mode, and how is it controlled?

Yes, the MAX1111EEE/V+T supports two power-down methods: software-controlled (via PD1/PD0 bits in the control byte) and hardware-controlled (via the SHDN pin). In software power-down at 1ksps, supply current drops to 6µA; SHDN pulled low reduces current to ≤10µA. Both modes retain register state and allow wake-up in <20µs (external clock) or <12ms (internal reference settling), ensuring rapid resumption of measurement tasks.