Analog Devices Inc./Maxim Integrated MAX1061BEEI

Overview

MAX1061BEEI from Maxim Integrated is a 10-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated +2.5V reference, byte-wide parallel (8+2) interface, and software-configurable 8-channel single-ended or 4-channel pseudo-differential input multiplexer. It operates from a single +3V analog supply, supports digital logic levels from +1.8V to +3.6V via VLOGIC, and delivers 250ksps sampling rate with 5.7mW power consumption at full speed. It is used in portable patient monitoring systems requiring low-power, high-accuracy signal digitization of biopotential sensors.

For engineers reviewing the MAX1061BEEI datasheet, MAX1061BEEI pinout, MAX1061BEEI application, or MAX1061BEEI equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic specifications (SINAD = 60dB, THD = –72dB), real-world application mappings, and two rigorously cross-checked alternative parts for industrial data-acquisition and battery-powered medical designs.

Technical Context

The MAX1061BEEI implements a charge-redistribution SAR architecture with an internal 3MHz full-power bandwidth track-and-hold stage, enabling undersampling of transient signals beyond its 250ksps Nyquist limit. Its control logic accepts an 8-bit configuration byte defining acquisition mode (internal/external), clock source (internal/external), unipolar/bipolar range, and single-ended/pseudo-differential input selection.

Conversion timing is deterministic: 13 clock cycles per conversion, with aperture jitter as low as 50ps in external acquisition mode. The device supports two software-selectable power-down modes-standby (10µA) and full shutdown (2µA)-triggered via PD0/PD1 bits in the control byte, with automatic wake-up in ≤2µs upon interface access.

Key Specifications

Pinout & Package

MAX1061BEEI 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 MAX1061BEEI, ADS7822U trades resolution and interface simplicity for lower cost and smaller footprint, while MAX11602EEE+ sacrifices speed and flexible input configuration for integration density and serial interface compatibility-neither offers pin-compatible replacement or identical feature parity.

Availability

MAX1061BEEI is available at Aetrix Electronics and suitable for portable medical devices, industrial data loggers, energy metering systems, and human-machine interface designs requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long production lifecycles.

Supply support for MAX1061BEEI 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 MAX1061BEEI belongs to Maxim's precision data-acquisition ADC product line, designed specifically for battery-powered instrumentation requiring low power, small size, and guaranteed monotonicity across automotive and industrial temperature ranges.

FAQ

What is the operating temperature range for the MAX1061BEEI?

The MAX1061BEEI is rated for operation from –40°C to +85°C, as indicated by the "E" grade suffix in its ordering code. This extended temperature range makes it suitable for deployment in industrial environments and outdoor medical equipment where ambient conditions exceed commercial-grade limits. All specified electrical characteristics-including INL, SINAD, and power consumption-are guaranteed across this full range.

Does the MAX1061BEEI require an external clock to operate?

No, the MAX1061BEEI does not require an external clock. It features an internal 3MHz clock generator that can be selected via control bits D7/D6 in the configuration byte. When using internal clock mode, the CLK pin must be tied to VDD or GND to prevent floating. External clock operation (100kHz–4.8MHz) is optional and used primarily to reduce aperture jitter in precision timing-critical applications.

How is the 10-bit conversion result read from the MAX1061BEEI?

The MAX1061BEEI uses a multiplexed 8-bit parallel bus (D7–D0) with HBEN (Pin 1) controlling data alignment. When HBEN = 0, D7–D0 deliver the 8 LSBs of the 10-bit result; when HBEN = 1, they deliver D8 and D9 (the 2 MSBs), with D7–D0 repurposed accordingly. Reading requires asserting CS and RD low, then sampling D7–D0 after INT goes low-confirming conversion completion.

Can the MAX1061BEEI interface directly with a 1.8V microcontroller?

Yes, the MAX1061BEEI supports direct interfacing with 1.8V microcontrollers via its VLOGIC pin, which accepts supply voltages from +1.8V to +3.6V. Digital outputs (D7–D0, INT, RD) are level-shifted to match VLOGIC, eliminating need for external level translators. Input thresholds (VIH/VIL) are also scaled dynamically, ensuring reliable communication at 1.8V logic levels.

What is the purpose of the COM pin on the MAX1061BEEI?

The COM pin serves as the analog ground reference for all input channels in single-ended mode and as the negative input reference in pseudo-differential mode. In single-ended operation, it defines the zero-code voltage; in differential mode, it establishes the common-mode point for channel pairs. Stability of COM to within ±0.5 LSB during conversion is mandatory-achieved by low-impedance grounding and local decoupling-to prevent gain/offset errors.