Analog Devices Inc./Maxim Integrated MAX1149BCUP+

Overview

The MAX1149BCUP+ from Maxim Integrated is a low-power, 14-bit, 8-channel single-ended or 4-channel differential analog-to-digital converter (ADC) with integrated track/hold, internal +2.500V reference, and SPI/QSPI/MICROWIRE-compatible serial interface. It operates from a single +2.7V to +3.6V supply, achieves 116ksps throughput, and supports software-configurable unipolar/bipolar and single-ended/differential input modes - ideal for battery-powered medical instruments and portable data loggers.

For engineers reviewing the MAX1149BCUP+ datasheet, MAX1149BCUP+ pinout, MAX1149BCUP+ application, or MAX1149BCUP+ equivalent, key selection criteria include its true-differential input architecture, ±2 LSB INL over 0°C to +70°C, 77dB SINAD at 1kHz, 3.0MHz small-signal bandwidth, and 20-pin TSSOP package with hardware shutdown and dual software power-down modes.

Technical Context

The MAX1149BCUP+ uses successive-approximation (SAR) architecture with an internal track/hold circuit and flexible analog input multiplexer supporting eight single-ended or four differential channel pairs (e.g., CH0/CH1). Its conversion timing is synchronized either by an internal 2.1MHz clock or an external serial clock up to 2.1MHz, requiring 18 SCLK cycles per conversion in external mode.

It features true-differential analog inputs with COM pin defining common-mode voltage, enabling both unipolar (0 to VREF) and bipolar (±VREF/2) operation. The internal +2.500V reference exhibits ±50ppm/°C tempco over the 0°C to +70°C range and supports external reference input from 1.5V to VDD for precision system-level calibration.

Key Specifications

Pinout & Package

MAX1149BCUP+ is housed in a 20-pin thin shrink small-outline package (TSSOP), thermally enhanced for compact PCB layouts and compatible with standard surface-mount reflow processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel, low-power, 14-bit ADC applications.

Compared with the MAX1149BCUP+, the ADS8684IPWR offers higher resolution and speed but lacks true-differential input flexibility and consumes more power in low-rate operation, while the AD7928BRUZ trades resolution and integration for raw speed and simpler timing - making the MAX1149BCUP+ optimal for battery-constrained, precision multichannel sensing where 14-bit fidelity and configurability outweigh peak throughput needs.

Availability

MAX1149BCUP+ is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered data loggers, and industrial process monitoring systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX1149BCUP+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX1146–MAX1149 product line was designed specifically for portable, low-power, multichannel data acquisition systems requiring integrated signal conditioning, flexible input configuration, and minimal external components.

FAQ

What is the operating temperature range for the MAX1149BCUP+?

The MAX1149BCUP+ is specified for operation from 0°C to +70°C, as indicated by the "BC" suffix in its ordering code. This commercial-grade temperature range makes it suitable for indoor portable instruments and non-automotive industrial environments where ambient thermal stress is moderate. The device maintains ±2 LSB INL and 77dB SINAD across this full range when powered from +2.7V to +3.6V.

Does the MAX1149BCUP+ require external passive components for stable operation?

Yes - the MAX1149BCUP+ requires three external capacitors: a 0.1µF ceramic capacitor from VDD to AGND, a 2.2µF tantalum or ceramic capacitor from REF to AGND, and a 0.01µF capacitor from REFADJ to AGND. These are mandatory for internal reference stability, power supply decoupling, and bandgap reference filtering. Omitting any compromises INL, reference accuracy, and startup reliability.

How does the MAX1149BCUP+ handle differential input configurations?

The MAX1149BCUP+ supports true-differential inputs via its analog MUX and dual T/H circuitry: selecting CH0/CH1 as a pair configures IN+ = CH0 and IN− = CH1, measuring their voltage difference directly. The COM pin remains unused in differential mode. This architecture achieves −85dB channel-to-channel crosstalk and preserves common-mode rejection without external instrumentation amplifiers.

Can the internal reference of the MAX1149BCUP+ be disabled in favor of an external reference?

Yes - the internal +2.500V reference can be disabled by connecting REFADJ to VDD, which disables the internal bandgap reference and reference buffer amplifier. In this mode, an external reference voltage between 1.5V and VDD must be applied to the REF pin. The device retains full performance specifications including ±2 LSB INL when used with a stable, low-noise external reference.

What power-down modes does the MAX1149BCUP+ support, and how do they affect wake-up time?

The MAX1149BCUP+ supports two software-controlled power-down modes via the PD1/PD0 bits in the control byte: fast power-down (120µA, ~1µs wake-up) and full power-down (300nA, ~2.5µs wake-up). Both modes retain register state and automatically exit on CS assertion or serial interface access - enabling rapid sampling bursts without reinitialization overhead in energy-constrained systems.