Analog Devices Inc./Maxim Integrated MAX1090ACEI

Overview

MAX1090ACEI from Maxim Integrated is a 10-bit successive-approximation ADC with integrated +2.5V reference, 8-channel single-ended/4-channel pseudo-differential analog input multiplexer, and byte-wide (8+2) parallel interface. It operates from a single +5V analog supply and supports digital logic levels from +2.7V to +5.5V via VLOGIC. Its 400ksps max sampling rate, 2.5mA active current, and 2µs wake-up make it suitable for portable data-acquisition systems requiring low-power, high-channel-count digitization.

For engineers reviewing the MAX1090ACEI datasheet, MAX1090ACEI pinout, MAX1090ACEI application, or MAX1090ACEI equivalent, key selection criteria include its software-configurable unipolar/bipolar input mode, internal track-and-hold with 6MHz full-power bandwidth, ±0.5 LSB INL, QSOP-28 package compatibility, and support for both internal and external clock acquisition modes.

Technical Context

The MAX1090ACEI implements a charge-redistribution SAR architecture with an integrated 12pF capacitive DAC and on-chip track-and-hold stage. Its analog front-end supports single-ended operation referenced to COM or pseudo-differential mode using channel pairs (e.g., CH0/CH1), with input stability requirements of ±0.5 LSB on the negative input during conversion.

Control is executed via an 8-bit configuration byte that sets acquisition mode (internal/external), unipolar/bipolar range, single-ended/differential topology, channel address (A2–A0), and power-down state (PD1/PD0). The device uses HBEN to multiplex 10-bit output across D7–D0 and D1/D9, D0/D8 pins, enabling microprocessor interfacing without external glue logic.

Key Specifications

Pinout & Package

MAX1090ACEI is housed in a 28-pin QSOP (Quarter-Size Outline Package) with 0.15mm lead pitch and standard JEDEC MO-137AC footprint. The package supports reflow soldering and provides thermal performance suitable for board-level integration in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX1166BCAP, MAX1090ACEI uniquely combines 10-bit accuracy, 400ksps parallel throughput, integrated +2.5V reference, and logic-level flexibility in a single 28-pin QSOP - making it optimal for µP-based data loggers requiring minimal external components and deterministic timing.

Availability

MAX1090ACEI 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 and long-term production continuity.

Supply support for MAX1090ACEI 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 MAX1090ACEI belongs to Maxim's precision data-acquisition ADC product line, designed specifically for low-power, multi-channel, µP-compatible digitization in space- and power-constrained embedded systems.

FAQ

What is the operating temperature range for MAX1090ACEI?

The MAX1090ACEI is rated for operation from 0°C to +70°C. This commercial-grade temperature specification is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet. The device maintains ±0.5 LSB INL and full 10-bit performance across this range when used with proper decoupling and layout practices. It is not rated for extended industrial (-40°C to +85°C) operation - that capability applies to the MAX1090AEEI variant.

Does MAX1090ACEI require an external clock to operate?

No, MAX1090ACEI does not require an external clock. It supports both internal and external clock modes. When bits D7=1 and D6=0 in the control byte, the internal 6MHz clock is enabled and the CLK pin must be tied to VDD or GND to prevent floating. External clock mode (D7=D6=1) accepts 100kHz–7.6MHz TTL/CMOS signals. Internal clock simplifies system design by offloading timing generation from the host µP.

How many analog input channels does MAX1090ACEI support?

MAX1090ACEI supports eight single-ended analog input channels (CH0–CH7) or four pseudo-differential channel pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7), as defined by the SGL/DIF bit in the control byte. This 8-/4-channel capability is specific to the MAX1090 family; the pin-compatible MAX1092 offers only four single-ended inputs. Channel selection is performed via A2–A0 address bits in the configuration byte.

Can MAX1090ACEI interface directly with a 3.3V microprocessor?

Yes, MAX1090ACEI can interface directly with a 3.3V microprocessor using the VLOGIC pin. By supplying +3.3V to VLOGIC (within the +2.7V to +5.5V range), the device configures its digital I/Os (D7–D0, INT, RD, WR, CS, HBEN) to operate at 3.3V logic levels - eliminating external level shifters. VDD remains at +5V for analog circuitry, ensuring full dynamic range and SNR performance.

What is the purpose of the HBEN pin on MAX1090ACEI?

The HBEN (High-Byte Enable) pin on MAX1090ACEI controls multiplexing of the 10-bit conversion result across the 8-bit data bus. When HBEN = 0, D7–D0 output the 8 LSBs; when HBEN = 1, D7–D0 output the 2 MSBs (D8/D9), with D1 and D0 repurposed as D9 and D8 respectively. This allows full 10-bit reads in two consecutive cycles without external latches or wider bus traces, optimizing µP interface efficiency in resource-constrained designs.