Analog Devices Inc./Maxim Integrated MAX1061AEEI+

Overview

MAX1061AEEI+ from Maxim Integrated is a 10-bit successive-approximation ADC with 8-channel single-ended / 4-channel pseudo-differential input multiplexing, +2.5V internal reference, byte-wide parallel (8+2) interface, and operation from a single +3V analog supply. It delivers 250ksps sampling rate, ±0.5 LSB INL, and 5.7mW power consumption at full speed, targeting battery-powered data acquisition in industrial control and patient monitoring systems.

For engineers reviewing the MAX1061AEEI+ datasheet, MAX1061AEEI+ pinout, MAX1061AEEI+ application, or MAX1061AEEI+ equivalent, key selection considerations include its -40°C to +85°C extended temperature grade, software-configurable unipolar/bipolar input mode, VLOGIC-compatible digital interface (1.8V–3.6V), internal track/hold with 3MHz full-power bandwidth, and dual power-down modes enabling <2µA shutdown current.

Technical Context

The MAX1061AEEI+ implements a charge-redistribution SAR architecture with integrated track/hold, supporting both internal and external clock modes (up to 4.8MHz) and internal/external acquisition timing control. Its analog front-end allows dynamic reconfiguration between single-ended and pseudo-differential input modes via software-controlled control byte bits SGL/DIF and UNI/BIP.

Conversion is initiated by latching an 8-bit control byte that selects channel (A2–A0), acquisition mode (ACQMOD), clock source (D6/D7), and power-down state (PD0/PD1). Output data is presented in binary (unipolar) or two's complement (bipolar) format across a tri-state parallel bus, with HBEN enabling high-byte (D8/D9) or low-byte (D0–D7) readout.

Key Specifications

Pinout & Package

MAX1061AEEI+ is housed in a 28-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and AD7495BRUZ, the MAX1061AEEI+ uniquely balances 10-bit precision, integrated +2.5V reference, parallel interface compatibility with legacy microcontrollers, and ultra-low shutdown current - making it optimal for space-constrained, battery-operated industrial and medical data loggers requiring guaranteed linearity over extended temperature.

Availability

MAX1061AEEI+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, and smart energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX1061AEEI+ 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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX1061AEEI+ belongs to Maxim's low-power, high-accuracy SAR ADC product line, engineered specifically for battery-powered data acquisition where integration, temperature stability, and interface simplicity are critical.

FAQ

What is the operating temperature range of the MAX1061AEEI+?

The MAX1061AEEI+ is rated for operation from –40°C to +85°C, as indicated by the "E" suffix in its part number. This extended industrial temperature grade ensures reliable performance in harsh environments such as factory automation cabinets, outdoor energy meters, and portable medical equipment exposed to ambient thermal cycling. The device maintains specified INL (±0.5 LSB), gain error (±2 LSB), and reference stability (±20ppm/°C) across this full range.

Does the MAX1061AEEI+ require an external clock source?

No - the MAX1061AEEI+ supports both internal and external clock modes. When configured for internal clock mode (D7=1, D6=0 in control byte), it generates its own ~3MHz conversion clock, eliminating the need for an external oscillator. In external clock mode (D7=D6=1), it accepts a TTL/CMOS-compatible clock from 100kHz to 4.8MHz. The internal clock simplifies layout and reduces BOM count, while external clocking enables precise synchronization with system timing domains.

How does the HBEN pin affect data readout on the MAX1061AEEI+?

The HBEN (High Byte Enable) pin determines how the 10-bit conversion result is presented on the 8-bit parallel bus. When HBEN = 0, D0–D7 carry the least-significant 8 bits (LSBs) of the result; when HBEN = 1, D0/D8 and D1/D9 carry the two most-significant bits (MSBs), and D2–D7 become don't-care. This multiplexing allows full 10-bit data transfer using only an 8-bit bus, reducing MCU pin count and simplifying interface design without requiring additional latches or shift registers.

Can the MAX1061AEEI+ interface directly with a 1.8V microcontroller?

Yes - the MAX1061AEEI+ features a dedicated VLOGIC pin that accepts a separate digital supply from +1.8V to +3.6V, independent of the +2.7V to +3.6V analog VDD rail. When VLOGIC = 1.8V, all digital inputs (CS, WR, RD, D0–D7) meet 1.8V logic thresholds (VIH = 0.5V, VIL = 0.8V), and outputs (D0–D7, INT) drive valid 1.8V-compatible VOH/VOL levels. This eliminates level-shifters in mixed-voltage systems and ensures robust communication with modern ultra-low-voltage MCUs and FPGAs.

What analog input configurations does the MAX1061AEEI+ support?

The MAX1061AEEI+ supports four software-selectable analog input modes via its control byte: single-ended unipolar (0V to VREF), single-ended bipolar (–VREF/2 to +VREF/2), pseudo-differential unipolar, and pseudo-differential bipolar. In single-ended mode, it scans CH0–CH7 against COM; in pseudo-differential mode, it measures voltage differences across predefined pairs (e.g., CH0–CH1, CH2–CH3). This configurability allows one MAX1061AEEI+ design to serve diverse sensor types - thermocouples, RTDs, bridge transducers, and biopotential electrodes - without hardware changes.