Analog Devices Inc./Maxim Integrated MAX1090BEEI+T

Overview

MAX1090BEEI+T from Maxim Integrated is a 10-bit successive-approximation ADC with 8-channel single-ended / 4-channel pseudo-differential analog input, +2.5V internal reference, and byte-wide parallel (8+2) interface. It operates from a single +5V analog supply and supports digital logic levels from +2.7V to +5.5V via VLOGIC. Designed for battery-powered data-acquisition systems requiring low power and compact size, it delivers 400ksps sampling at 2.5mA.

For engineers reviewing the MAX1090BEEI+T datasheet, MAX1090BEEI+T pinout, MAX1090BEEI+T application, or MAX1090BEEI+T equivalent, key selection criteria include its ±1 LSB INL over –40°C to +85°C, software-configurable unipolar/bipolar mode, fast 2µs wake-up from shutdown, and QSOP-28 package compatibility with industrial control and patient monitoring signal chains.

Technical Context

The MAX1090BEEI+T implements a charge-redistribution SAR architecture with integrated track-and-hold, supporting both internal and external clock modes. Its analog front-end allows dynamic reconfiguration between single-ended and pseudo-differential input modes via software-controlled control byte (SGL/DIF, UNI/BIP bits), with COM referenced zero-code alignment.

Conversion timing is tightly coupled to acquisition mode: internal acquisition uses three clock cycles (~1µs at 7.6MHz) before conversion begins, while external acquisition enables precise aperture control via two WR pulses. The device tri-states INT on CS high and supports high-byte/low-byte multiplexing via HBEN for 10-bit data readout on an 8-bit bus.

Key Specifications

Pinout & Package

MAX1090BEEI+T is housed in a 28-pin QSOP (Quad Small Outline Package) with 0.15mm lead pitch and 9.9mm × 3.9mm body size, optimized for high-density PCB layouts in space-constrained industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit parallel ADC applications.

Compared with MAX1090ACEI+, the MAX1090BEEI+T trades ±0.5 LSB linearity for –40°C to +85°C operation and lower cost; versus ADS7822U, it provides 2-bit higher resolution, parallel interface speed, and integrated reference - at the expense of SPI simplicity and smaller package.

Availability

MAX1090BEEI+T is available at Aetrix Electronics and suitable for industrial control systems, portable data-acquisition equipment, and energy-monitoring devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1090BEEI+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 precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.

The MAX1090 series belongs to Maxim's precision data-converter product line, designed specifically for low-power, high-accuracy digitization in space- and energy-constrained embedded systems with demanding environmental requirements.

FAQ

What is the operating temperature range of the MAX1090BEEI+T?

The MAX1090BEEI+T is rated for –40°C to +85°C operation, making it suitable for industrial and automotive-adjacent environments where extended thermal stability is required. This range is confirmed in the Ordering Information table and validated across all DC and dynamic specifications in the datasheet, including ±1 LSB INL and 400ksps performance.

Does the MAX1090BEEI+T require an external clock source?

No - the MAX1090BEEI+T supports both internal and external clock modes. When configured for internal clock (D7=1, D6=0), it generates its own 7.6MHz clock, eliminating external timing components. External clock mode (D7=D6=1) accepts 100kHz–7.6MHz TTL/CMOS inputs with 30%–70% duty cycle, offering flexibility for synchronized multi-ADC systems.

How does the MAX1090BEEI+T handle 10-bit data output on an 8-bit bus?

The MAX1090BEEI+T uses the HBEN pin to multiplex its 10-bit result across D0–D7. When HBEN=0, D0–D7 carry the 8 LSBs; when HBEN=1, they carry D8 and D9 (MSBs) alongside D0–D7. This allows full 10-bit resolution without expanding bus width - a key design feature for microprocessor interfaces with fixed 8-bit data paths.

Can the MAX1090BEEI+T operate with a 3.3V digital supply?

Yes - the VLOGIC pin accepts +2.7V to +5.5V, enabling direct interfacing with 3.3V microprocessors without level shifters. Digital outputs (D0–D7, INT) are referenced to VLOGIC, and input thresholds scale accordingly (VIH = 0.7×VLOGIC, VIL = 0.3×VLOGIC), ensuring reliable communication at 3.3V logic levels.

What analog input configurations does the MAX1090BEEI+T support?

The MAX1090BEEI+T supports four software-selectable configurations via its control byte: unipolar single-ended (0 to +2.5V), bipolar single-ended (–1.25V to +1.25V), unipolar pseudo-differential (e.g., CH0–CH1), and bipolar pseudo-differential. Channel selection (CH0–CH7) and mode are set dynamically per conversion, enabling flexible sensor interfacing without hardware rework.