Analog Devices Inc./Maxim Integrated MAX1090AEEI

Overview

MAX1090AEEI from Maxim Integrated is a 10-bit successive-approximation ADC with internal +2.5V reference, 400ksps max sampling rate, and software-configurable 8-channel single-ended or 4-channel pseudo-differential analog inputs. It operates from a single +5V analog supply and supports digital interface voltages from +2.7V to +5.5V via VLOGIC, enabling direct connection to mixed-voltage microcontrollers in portable data-acquisition systems.

For engineers reviewing the MAX1090AEEI datasheet, MAX1090AEEI pinout, MAX1090AEEI application, or MAX1090AEEI equivalent, this device is selected for low-power, space-constrained designs requiring stable internal reference, fast wake-up (2µs), byte-wide parallel interface (D0–D9), and operation across –40°C to +85°C industrial temperature range.

Technical Context

The MAX1090AEEI implements a charge-redistribution SAR architecture with integrated track-and-hold (T/H), delivering 6MHz full-power bandwidth and 350kHz full-linear bandwidth. Its T/H stage acquires input signals in ≤3.6µs (typical) and supports both internal and external clock modes - internal clock yields fixed 3.6µs conversion time, while external clock allows user-defined timing with 100kHz–7.6MHz frequency range.

Conversion control uses an 8-bit configuration byte defining channel address (A2–A0), unipolar/bipolar mode (UNI/BIP), single-ended/pseudo-differential mode (SGL/DIF), acquisition mode (ACQMOD), and power-down state (PD0/PD1). The device tri-states INT on CS high and provides HBEN for 10-bit result multiplexing across D0–D9 pins.

Key Specifications

Pinout & Package

MAX1090AEEI is housed in a 28-pin QSOP package (5.3mm × 10.2mm body, 0.65mm pitch), compatible with standard surface-mount assembly processes and offering thermal performance suitable for industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1090ACEI, the MAX1090AEEI adds extended temperature qualification (–40°C to +85°C) without changing pinout or firmware; versus ADS7822U, it trades resolution and package size for integrated reference, parallel speed, and multi-channel flexibility - making it optimal for industrial µP-based DAQ where layout area and component count are constrained.

Availability

MAX1090AEEI is available at Aetrix Electronics and suitable for industrial control systems, portable data loggers, energy metering front-ends, and medical patient monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1090AEEI 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, communications, and consumer applications.

The MAX1090AEEI belongs to Maxim's precision data-acquisition ADC family, designed specifically for low-power, multi-channel, embedded measurement systems where integration of reference, interface, and temperature robustness reduces system-level design complexity.

FAQ

What is the operating temperature range of the MAX1090AEEI?

The MAX1090AEEI is specified for continuous operation from –40°C to +85°C. This extended industrial temperature range is confirmed in the Ordering Information table and Electrical Characteristics section of the datasheet, where all min/typ/max parameters are guaranteed across this full range - unlike the MAX1090ACEI variant, which is limited to 0°C to +70°C. The MAX1090AEEI maintains ±0.5 LSB INL and 2.5mA supply current at +85°C.

Does the MAX1090AEEI require an external clock to operate?

No, the MAX1090AEEI does not require an external clock. It supports both internal and external clock modes. In internal clock mode (configured by setting D7=1, D6=0 in the control byte), the device generates its own 6MHz clock internally, resulting in a fixed 3.6µs conversion time. 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 many analog input channels does the MAX1090AEEI support in single-ended mode?

The MAX1090AEEI supports eight analog input channels (CH0 through CH7) in single-ended mode. This is explicitly stated in the General Description and Pin Configurations sections, and confirmed by the 3-bit address field (A2–A0) in the control byte, which provides eight unique channel selections. In pseudo-differential mode, it supports four input pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7), matching the MAX1090AEEI's 28-pin QSOP package and functional specification.

Can the MAX1090AEEI interface directly with a 3.3V microcontroller?

Yes, the MAX1090AEEI can interface directly with a 3.3V microcontroller using its VLOGIC pin. The device allows independent digital supply voltage from +2.7V to +5.5V, so applying 3.3V to VLOGIC configures D0–D9 and INT outputs to swing between 0V and 3.3V, matching 3.3V µP logic levels. VDD remains at +5V for analog circuitry, and no level-shifting circuitry is required - a key advantage over non-VLOGIC ADCs.

What is the purpose of the HBEN pin on the MAX1090AEEI?

The HBEN (High-Byte Enable) pin on the MAX1090AEEI controls multiplexing of the 10-bit conversion result across the 8-bit data bus. When HBEN = 0, D0–D7 present the 8 LSBs of the result; when HBEN = 1, D1 and D0 present D9 and D8 respectively, allowing full 10-bit readout in two consecutive cycles. This eliminates the need for a 10-bit-wide bus and enables compatibility with standard 8-bit microprocessor data paths while retaining full resolution.