Analog Devices Inc./Maxim Integrated MAX1086ETA+T

Overview

MAX1086ETA+T from Maxim Integrated is a 10-bit, 2-channel single-ended analog-to-digital converter (ADC) in an 8-pin TDFN-EP package, operating from a +5V supply. It delivers 150ksps sampling rate, ±1.0 LSB INL, 61dB SINAD, and consumes only 320µA at full speed. Designed for low-power portable data acquisition, it integrates a successive-approximation (SAR) core, internal conversion clock, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface.

For engineers reviewing the MAX1086ETA+T datasheet, MAX1086ETA+T pinout, MAX1086ETA+T application, or MAX1086ETA+T equivalent, key selection criteria include its 2-channel single-ended input architecture, AutoShutdown™ current of 0.2µA, 1.4µs acquisition time, and compatibility with microcontrollers requiring minimal board space and battery-efficient signal digitization.

Technical Context

The MAX1086ETA+T implements a SAR ADC architecture with an integrated track-and-hold (T/H) circuit that enters tracking mode on the rising edge of CNVST and holds on the falling edge. Its input structure supports unipolar 0 to VREF operation with channel selection via CNVST timing - AIN1 selected by a single high pulse, AIN2 by a high–low–high sequence.

It uses an internal 4MHz oscillator (±10% tolerance), eliminating external clock dependency, and features a 3-wire serial interface where DOUT transitions on the falling edge of SCLK and outputs 12 bits (10 data + 2 sub-bits) MSB-first. The device requires an external reference (4.096V typical) and mandates 0.1µF bypassing at both REF and VDD pins for specified performance.

Key Specifications

Pinout & Package

MAX1086ETA+T is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.75mm height) package with exposed pad (EP) for thermal enhancement. The EP must be connected to GND for optimal thermal performance and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11100ETE+, the MAX1086ETA+T offers optimal balance of ultra-low shutdown current (0.2µA), compact TDFN packaging, and seamless CNVST-driven dual-channel control - making it uniquely suited for space- and energy-constrained portable instrumentation where 10-bit fidelity suffices.

Availability

MAX1086ETA+T is available at Aetrix Electronics and suitable for portable temperature monitors, flowmeters, and touch screens requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MAX1086ETA+T 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 portable applications.

The MAX1086–MAX1089 family was engineered specifically for ultra-low-power, space-constrained data acquisition systems - delivering high-speed 10-bit conversion in sub-3mm² packages without sacrificing DC accuracy or dynamic performance.

FAQ

What is the maximum sampling rate of the MAX1086ETA+T?

The MAX1086ETA+T achieves a maximum sampling rate of 150ksps under specified conditions (VDD = +4.75V to +5.25V, fSCLK ≤ 8MHz). This rate is sustained with full 10-bit accuracy, 61dB SINAD, and ±1.0 LSB INL across the -40°C to +85°C temperature range. At lower rates (e.g., 10ksps), supply current drops to 15µA, enabling extended battery life in intermittent-sampling applications.

Does the MAX1086ETA+T require an external reference voltage?

Yes, the MAX1086ETA+T requires an external reference voltage applied to the REF pin. It accepts 1.0V to VDD+50mV; for +5V operation, a 4.096V reference is typical to yield 3.91mV/LSB step size. A 0.1µF ceramic capacitor must be placed directly between REF and GND to ensure stability and minimize noise-induced errors in the conversion result.

How does channel selection work on the MAX1086ETA+T?

Channel selection on the MAX1086ETA+T is controlled solely by the CNVST pin timing. To sample AIN1, assert CNVST high for ≥1.4µs (acquisition), then drive it low to initiate conversion. To sample AIN2, apply a high–low–high pulse sequence on CNVST (each edge ≥30ns wide), then hold high for ≥1.4µs before falling. No register writes or configuration bits are needed - the logic is fully hardware-timed.

What is the purpose of the exposed pad (EP) on the MAX1086ETA+T package?

The exposed pad (EP) on the MAX1086ETA+T's 8-pin TDFN package serves as a thermal and electrical ground connection. It must be soldered to a PCB copper pour tied to GND to dissipate heat and reduce thermal resistance (derating improves from 9.70mW/°C to 18.2mW/°C). Leaving it unconnected degrades thermal performance and may increase noise susceptibility in precision analog measurements.

Can the MAX1086ETA+T interface directly with an SPI master microcontroller?

Yes, the MAX1086ETA+T interfaces directly with standard SPI masters (e.g., STM32, ESP32) using CPOL = 0 and CPHA = 0 mode. DOUT transitions on the falling edge of SCLK and is sampled on the rising edge. The 12-bit output (10 data + 2 sub-bits) requires two 8-bit reads - the first contains bits B9–B2, the second contains B1–B0 plus sub-bits S1/S0 - with DOUT entering high-Z state after completion.