Analog Devices Inc./Maxim Integrated MAX1290BEEI+

Overview

MAX1290BEEI+ from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (ADC) with integrated +2.5V reference, byte-wide parallel (8+4) interface, 400ksps max sampling rate, and software-configurable 8-channel single-ended or 4-channel pseudo-differential input. It operates from a single +5V analog supply and supports digital logic levels from +2.7V to +5.5V via VLOGIC, enabling direct interfacing with mixed-voltage microcontrollers in portable data-acquisition systems.

For engineers reviewing the MAX1290BEEI+ datasheet, MAX1290BEEI+ pinout, MAX1290BEEI+ application, or MAX1290BEEI+ equivalent, this page delivers verified electrical specifications, thermal range (-40°C to +85°C), QSOP-28 package mapping, real-world timing behavior (e.g., 3.2µs conversion time, 2µs wake-up), and validated alternative parts for industrial sensor interfaces and battery-powered instrumentation.

Technical Context

The MAX1290BEEI+ implements a capacitive charge-redistribution SAR architecture with an internal track-and-hold stage offering 6MHz full-power bandwidth and 350kHz full-linear bandwidth. Its control logic accepts an 8-bit configuration byte defining acquisition mode (internal/external), unipolar/bipolar range, single-ended/pseudo-differential topology, and channel selection (CH0–CH7).

It features dual power-down modes: standby (≤10µA) and full shutdown (≤2µA), activated via PD0/PD1 bits in the control byte. The on-chip +2.5V bandgap reference exhibits ±2ppm/°C drift and maintains ±0.5 LSB INL over temperature when bypassed with a 4.7µF capacitor at REF.

Key Specifications

Pinout & Package

MAX1290BEEI+ is housed in a 28-pin QSOP (Quad Small Outline Package) with 0.15mm lead pitch and 9.9mm × 3.9mm footprint, compatible with standard surface-mount reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1290ACEI+, the MAX1290BEEI+ guarantees ±0.5 LSB INL over -40°C to +85°C and supports wider VLOGIC range (2.7V–5.5V); versus ADS7822U, it delivers 4× resolution, parallel throughput, and integrated reference - critical for precision industrial and medical designs.

Availability

MAX1290BEEI+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, energy metering subsystems, and touchscreen controller interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1290BEEI+ 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, medical, and communications applications.

The MAX1290 series was designed specifically for low-power, high-accuracy data acquisition in space-constrained and battery-operated systems - emphasizing integrated functionality (reference, T/H, parallel interface) and wide supply flexibility.

FAQ

What is the guaranteed integral nonlinearity (INL) specification for MAX1290BEEI+ over its full operating temperature range?

The MAX1290BEEI+ guarantees ±1 LSB integral nonlinearity over its full -40°C to +85°C operating range, as confirmed in the Electrical Characteristics table under "DC ACCURACY" with ordering grade E suffix. This is distinct from the ±0.5 LSB typical value measured at +25°C, which applies only to the MAX1290ACEI+ variant.

Does MAX1290BEEI+ require an external clock source, or does it include an internal oscillator?

The MAX1290BEEI+ supports both internal and external clock modes. When configured for internal clock mode (D7=1, D6=0 in control byte), it generates its own 7.6MHz clock - eliminating the need for external timing components. The CLK pin must be tied to VDD or GND to prevent floating in this mode.

How does the HBEN pin function during data readout from MAX1290BEEI+?

The HBEN (High Byte Enable) pin on MAX1290BEEI+ controls multiplexing of the 12-bit conversion result onto the 8-bit data bus: when HBEN = 1, D0–D3 output D8–D11 (MSB nibble); when HBEN = 0, D0–D7 output D0–D7 (LSB byte). This allows full 12-bit reads using standard 8-bit µP interfaces without additional latches.

Can MAX1290BEEI+ operate with a 3.3V digital supply while maintaining full 12-bit performance?

Yes - MAX1290BEEI+ supports VLOGIC from +2.7V to +5.5V, including 3.3V. All digital timing parameters (tDS, tDH, tCWH, etc.) and output drive strength (VOH/VOL) are fully specified at VLOGIC = 3.3V, ensuring reliable interface with 3.3V microcontrollers without level shifters.

What is the minimum acquisition time required before initiating conversion on MAX1290BEEI+?

The MAX1290BEEI+ specifies a minimum acquisition time (tACQ) of 3.2µs in internal acquisition mode. This is derived from its 13-clock-cycle conversion time at 7.6MHz internal clock frequency and is independent of external signal source impedance when driven from ≤3kΩ sources.