Analog Devices Inc./Maxim Integrated MAX1149BEUP+

Overview

MAX1149BEUP+ from Maxim Integrated is a low-power, 14-bit, 8-channel single-ended or 4-channel differential analog-to-digital converter with internal track/hold, +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 input modes - used in portable medical instruments and battery-powered data loggers.

For engineers reviewing the MAX1149BEUP+ datasheet, MAX1149BEUP+ pinout, MAX1149BEUP+ application, or MAX1149BEUP+ equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in precision low-voltage sensing, and confirmed alternative parts for supply continuity and design flexibility.

Technical Context

The MAX1149BEUP+ implements successive-approximation (SAR) architecture with true-differential analog input circuitry, including an integrated multiplexer, dual T/H capacitors, and switched-capacitor DACs. Its internal clock runs at 2.1MHz, enabling 6–8µs conversion time, while external clock mode supports up to 2.1MHz SCLK with 18-cycle timing per conversion.

It features hardware shutdown and two software power-down modes - fast power-down (120µA) and full power-down (300nA) - with automatic wake-up via serial interface access. The device maintains ±2 LSB INL over –40°C to +85°C and supports flexible reference configuration: internal +2.500V or external 1.5V to VDD.

Key Specifications

Pinout & Package

MAX1149BEUP+ is housed in a 20-pin TSSOP package (package code U20-3), with exposed pad for thermal performance. Pin functions are validated per Maxim's official pin description table and functional diagram (Rev 2, Jan 2007).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8684IPWR and AD7928BRUZ, the MAX1149BEUP+ uniquely balances 14-bit accuracy, ultra-low power (300nA shutdown), integrated +2.500V reference, and true-differential input - making it optimal for portable, battery-constrained, high-fidelity sensing where layout area and BOM count are critical.

Availability

MAX1149BEUP+ is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered data loggers, and industrial process controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1149BEUP+ 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 and mixed-signal ICs for demanding industrial, medical, and communications applications - emphasizing integration, low power, and robust performance.

The MAX1146–MAX1149 family was engineered for portable, low-voltage, high-accuracy data acquisition - delivering integrated T/H, reference, and serial interface in compact TSSOP packages to reduce system-level component count and PCB area.

FAQ

What is the maximum sampling rate of the MAX1149BEUP+?

The MAX1149BEUP+ achieves a maximum throughput rate of 116 ksps in external clock mode with an 2.1 MHz SCLK and 18-clock conversion cycle. In internal clock mode, it operates at 116 ksps with identical timing but uses its onboard 2.1 MHz oscillator - eliminating external clock source requirements while maintaining full 14-bit accuracy.

Does the MAX1149BEUP+ support differential input configurations?

Yes, the MAX1149BEUP+ supports true-differential input operation across four channel pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7) with software-selectable mode via the SGL/DIF bit in the control byte. Its differential architecture provides 85 dB channel-to-channel crosstalk rejection and inherent common-mode noise immunity - critical for precision sensor interfaces.

What reference voltage options does the MAX1149BEUP+ provide?

The MAX1149BEUP+ includes a factory-trimmed +2.500 V internal reference with ±40 ppm/°C tempco over –40°C to +85°C. It also accepts external references from 1.5 V to VDD at the REF pin. The REFADJ pin allows disabling the internal bandgap by pulling it high, enabling use of precision external references without additional buffering.

How does the power-down functionality work on the MAX1149BEUP+?

The MAX1149BEUP+ offers three power states: full power-down (300 nA), fast power-down (120 µA), and normal operation (1.1 mA at 116 ksps). Power-down is controlled via PD1/PD0 bits in the control byte. Exiting power-down occurs automatically on the next CS assertion - no wake-up delay or initialization sequence required - enabling rapid, deterministic sampling bursts.

Is the MAX1149BEUP+ pin-compatible with other devices in the MAX1146–MAX1149 family?

Yes, all MAX1146–MAX1149 variants share identical 20-pin TSSOP packaging and pinout, including MAX1149BEUP+. This allows direct substitution between voltage-range variants (e.g., MAX1147BEUP+ for +2.7V–+3.6V) and channel-count variants (e.g., MAX1146BEUP+ for 4-channel) without PCB redesign - provided reference and supply constraints are met.