Analog Devices Inc./Maxim Integrated MAX1280BEUP+T

Overview

MAX1280BEUP+T from Maxim Integrated is a 12-bit, 400ksps serial analog-to-digital converter with integrated 8-channel multiplexer, track/hold, and internal +2.5V reference. It operates from a single +4.5V to +5.5V supply, supports software-configurable unipolar/bipolar and single-ended/pseudo-differential inputs, and targets portable data acquisition systems requiring low power and high channel density.

For engineers reviewing the MAX1280BEUP+T datasheet, MAX1280BEUP+T pinout, MAX1280BEUP+T application, or MAX1280BEUP+T equivalent, this page delivers verified electrical specs, real-world timing behavior, thermal performance across -40°C to +85°C, and precise interface compatibility with SPI/QSPI/MICROWIRE controllers and TMS320 DSPs.

Technical Context

The MAX1280BEUP+T uses successive-approximation (SAR) architecture with an on-chip track/hold that acquires input signals in ≤468ns and completes conversion in 2.5µs at 400ksps. Its pseudo-differential input structure samples only the IN+ node while holding IN– stable to ±0.5LSB, enabling 4-channel differential or 8-channel single-ended operation without external signal conditioning.

It features four software-selectable power modes-normal (2.5mA), reduced-power (1.3mA), fast power-down (0.9mA), and full power-down (2µA)-with automatic wake-up via serial interface access. The internal reference buffer provides ±1.5% adjustment range and ±15ppm/°C TC, and supports external reference input from 1V to VDD1.

Key Specifications

Pinout & Package

MAX1280BEUP+T is housed in a 20-pin TSSOP package (4.4mm × 6.5mm, 0.65mm pitch), optimized for compact PCB layouts and automated assembly. Pin functions are electrically validated per Maxim's official datasheet Rev 2 (10/10).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7822U and AD7490BRUZ, the MAX1280BEUP+T uniquely balances integrated functionality (mux + T/H + ref), industrial temperature range, and ultra-low shutdown current (2µA) in a compact 20-TSSOP - making it optimal for space-constrained, battery-aware industrial data loggers.

Availability

MAX1280BEUP+T is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and industrial process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1280BEUP+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX1280/MAX1281 family was designed specifically for low-power, multi-channel data acquisition in portable and battery-operated systems - emphasizing integration, precision, and ease of microcontroller interfacing.

FAQ

What is the maximum sampling rate supported by the MAX1280BEUP+T?

The MAX1280BEUP+T supports a maximum sampling rate of 400ksps under standard operating conditions (VDD = +5V, fSCLK = 6.4MHz). This rate is achieved with 16 clock cycles per conversion and corresponds to a conversion time of 2.5µs. Performance remains stable across the full -40°C to +85°C temperature range, with guaranteed no missing codes and ±1 LSB INL.

Does the MAX1280BEUP+T require an external reference voltage?

No, the MAX1280BEUP+T includes an internal +2.500V reference with ±0.8% initial accuracy and ±15ppm/°C temperature coefficient. It can operate fully autonomously using this reference. An external reference (1V to VDD1) may be applied to the REF pin only when the internal buffer is disabled by pulling REFADJ to VDD1 - a configuration explicitly supported in the MAX1280BEUP+T datasheet.

How does the pseudo-differential input mode work on the MAX1280BEUP+T?

In pseudo-differential mode, the MAX1280BEUP+T samples only the IN+ node (e.g., CH0), while the IN– node (e.g., CH1) is held stable at COM or a fixed reference. The device computes the difference (IN+ − IN−), but IN− must remain within ±0.5LSB of its nominal value during conversion. Valid pairs are CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7 - all defined in the MAX1280BEUP+T control-byte mapping.

What power-saving modes are available on the MAX1280BEUP+T?

The MAX1280BEUP+T offers four distinct power modes controlled by PD1/PD0 bits: normal operation (2.5mA), reduced-power mode (1.3mA), fast power-down (0.9mA), and full power-down (2µA). Power mode selection is software-configurable via the control byte, and the device automatically wakes up upon any serial interface activity - enabling efficient duty-cycled operation in battery-powered systems.

Is the MAX1280BEUP+T compatible with SPI microcontrollers?

Yes, the MAX1280BEUP+T is fully compatible with SPI, QSPI, and MICROWIRE interfaces. It uses CPOL = 0 and CPHA = 0 timing - data sampled on SCLK rising edge, with CS active-low. The 4-wire interface (DIN, DOUT, SCLK, CS) requires no external logic, and the SSTRB output provides precise strobing for TMS320-family DSP synchronization - all confirmed in the MAX1280BEUP+T functional timing diagrams.