Analog Devices Inc./Maxim Integrated MAX1290ACEI

Overview

MAX1290ACEI from Maxim Integrated is a 12-bit successive-approximation ADC with 8-channel single-ended / 4-channel pseudo-differential analog input, +2.5V internal reference, byte-wide parallel (8+4) interface, and 400ksps max sampling rate. 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 microprocessors in portable data-acquisition systems.

For engineers reviewing the MAX1290ACEI datasheet, MAX1290ACEI pinout, MAX1290ACEI application, or MAX1290ACEI equivalent, this device is selected for low-power, space-constrained designs requiring precise 12-bit conversion with software-configurable unipolar/bipolar inputs, fast wake-up (2µs), and automatic power-down (<10µA shutdown current).

Technical Context

The MAX1290ACEI implements a capacitive charge-redistribution SAR architecture with integrated track-and-hold, supporting both internal and external clock modes (up to 7.6MHz) and internal/external acquisition control. Its analog front-end allows dynamic reconfiguration between single-ended and pseudo-differential input modes via software-controlled control byte.

It features an on-chip +2.5V bandgap reference with ±2ppm/°C temperature coefficient and 2.49V–2.51V output tolerance, alongside programmable power-down states that reduce supply current to 2µA in shutdown mode while maintaining full functionality upon wake-up.

Key Specifications

Pinout & Package

MAX1290ACEI is housed in a 28-pin QSOP package (5.3mm × 10.2mm footprint) with exposed pad for thermal performance. Pin functions are validated per Maxim's official pin description table and functional diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1290BCEI, the MAX1290ACEI offers tighter DC accuracy for precision measurement; compared with ADS7822U, it provides faster throughput, integrated reference, and parallel interface simplicity-reducing firmware overhead and external component count.

Availability

MAX1290ACEI is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, energy meter data logging, and touchscreen controller interface applications requiring stable component supply across extended production lifecycles.

Supply support for MAX1290ACEI 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, with emphasis on integration, low power, and reliability.

The MAX1290ACEI belongs to Maxim's high-performance data-acquisition ADC family, engineered specifically for battery-powered and space-constrained systems needing 12-bit resolution, software-configurable inputs, and minimal external components.

FAQ

What is the operating temperature range of the MAX1290ACEI?

The MAX1290ACEI is specified for operation from 0°C to +70°C, as indicated by the 'C' grade suffix in its ordering code. This commercial temperature range suits indoor industrial controls, portable instrumentation, and consumer medical devices where ambient conditions remain within standard office or lab environments. The device maintains full DC accuracy (±0.5 LSB INL) and dynamic performance (67dB SINAD) across this range.

Does the MAX1290ACEI require an external clock source?

No - the MAX1290ACEI supports both internal and external clock modes. When configured for internal clock operation (D7=1, D6=0 in control byte), it generates its own 6MHz conversion clock, eliminating the need for external timing components. The CLK pin must be tied to VDD or GND in this mode to prevent floating. External clock mode (D7=D6=1) accepts 100kHz–7.6MHz TTL/CMOS signals for precise timing control.

How does the HBEN pin function in the MAX1290ACEI parallel interface?

The HBEN (High-Byte Enable) pin controls multiplexing of the 12-bit conversion result onto the 8-bit data bus. When HBEN = 0, D0–D7 output the eight LSBs; when HBEN = 1, D0–D3 output the four MSBs (D8–D11). This allows full 12-bit reads using standard 8-bit µP buses without requiring additional address/data demultiplexing logic or wider bus traces.

Can the MAX1290ACEI operate with a 3.3V digital supply?

Yes - the MAX1290ACEI's VLOGIC pin accepts +2.7V to +5.5V, making it fully compatible with 3.3V digital systems. When VLOGIC = 3.3V, the digital outputs (D0–D7, INT) swing between 0V and 3.3V, matching standard LVCMOS logic levels. The analog section remains powered by +5V (VDD), ensuring full 12-bit ENOB performance independent of digital rail voltage.

What is the purpose of the COM pin on the MAX1290ACEI?

The COM (Common) pin serves as the ground reference for analog inputs in single-ended mode and as the negative input reference in pseudo-differential mode. In single-ended operation, it sets the zero-code voltage and must remain stable to ±0.5 LSB during conversion - typically achieved with a low-impedance connection to system AGND and local 0.1µF bypassing. Its stability directly impacts offset error and noise performance.