Analog Devices Inc./Maxim Integrated MAX117EAI+T

Overview

MAX117EAI+T from Maxim Integrated is an 8-bit, 8-channel analog-to-digital converter (ADC) with half-flash architecture, 400ksps sampling rate, 1.8µs conversion time, ±1LSB total unadjusted error, and 1µA power-down current. It operates from a single +3.0V to +3.6V supply and integrates an internal track/hold for digitizing fast analog signals in portable battery-powered data acquisition systems.

For engineers reviewing the MAX117EAI+T datasheet, MAX117EAI+T pinout, MAX117EAI+T application, or MAX117EAI+T equivalent, this page delivers verified electrical specs, validated 28-pin SSOP package mapping, confirmed microprocessor-compatible parallel interface behavior, and real-world timing constraints for burst-mode system-health monitoring designs.

Technical Context

The MAX117EAI+T uses a two-stage half-flash architecture: a 4-bit flash ADC generates the MSBs and drives an internal DAC to produce a residue voltage, which a second 4-bit flash ADC converts into the LSBs-achieving full 8-bit resolution with only 15 comparators. Its internal analog multiplexer selects among eight input channels under A0–A2 address control, with IN8 hardwired to REF+ for reference monitoring.

Digital interface operation depends on the MODE pin: in read mode (MODE = GND), RD initiates conversion and WR/RDY functions as a ready-status open-collector output; in write-read mode (MODE = VDD), WR starts conversion and INT signals completion, enabling pipelined operation when WR and RD are tied together. Acquisition time is 450ns minimum, and power-up from PWRDN takes <900ns.

Key Specifications

Pinout & Package

The MAX117EAI+T is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, JEDEC MO-153 compliant, body size 10.2mm × 5.3mm, and exposed pad not present. Pin 1 marked by notch or dot; recommended reflow profile per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, multi-channel ADC applications.

Compared with the MAX117EAI+T, the ADS7822U offers serial simplicity but sacrifices channel count and autonomous power management, while the MAX11100ETL+ delivers higher resolution at the cost of µP interface compatibility and 2.5× higher active current-making the MAX117EAI+T optimal for low-power parallel-bus systems requiring 8-channel consolidation and sub-µA sleep.

Availability

MAX117EAI+T is available at Aetrix Electronics and suitable for battery-powered data loggers, portable medical sensors, and industrial system-health monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX117EAI+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications.

The MAX113/MAX117 family was designed specifically for low-power, microprocessor-centric data acquisition in space- and energy-constrained portable systems-emphasizing single-supply operation, integrated track/hold, and seamless parallel bus interfacing.

FAQ

What is the guaranteed operating temperature range for the MAX117EAI+T?

The MAX117EAI+T is specified for operation from -40°C to +85°C, as indicated by the 'E' grade in the part number. This industrial temperature range is validated across all key parameters including total unadjusted error (±1LSB), conversion time (1.8µs), and power-down current (1µA typical), ensuring reliability in demanding embedded environments without derating.

Does the MAX117EAI+T require an external clock source?

No, the MAX117EAI+T does not require an external clock. Its half-flash architecture and internal timing control generate all necessary sequencing signals autonomously. Conversion timing is governed solely by the µP's RD or WR strobes and internal delays (e.g., tACQ = 450ns, tCWR = 1.8µs), eliminating clock distribution complexity and jitter sensitivity in the system design.

How does the IN8 channel function in the MAX117EAI+T?

In the MAX117EAI+T, IN8 is an internally hardwired analog input that always monitors the REF+ voltage-no external connection is needed. When selected via A2–A0 = 111, the ADC returns a digital code proportional to REF+, enabling real-time verification of reference stability and ratiometric integrity without consuming a physical input pin or external routing.

Can the MAX117EAI+T interface directly with an 8-bit microprocessor data bus?

Yes, the MAX117EAI+T features latched, three-state D0–D7 outputs that connect directly to an 8-bit parallel µP data bus without external interface logic. In read mode, it behaves as a memory-mapped I/O port; in write-read mode, it supports standard µP bus timing with WR, RD, CS, and INT handshaking-fully satisfying common microprocessor bus protocols.

What is the purpose of the MODE pin on the MAX117EAI+T?

The MODE pin on the MAX117EAI+T selects between two distinct digital interface protocols: MODE = GND configures read mode (RD-initiated conversion with WR/RDY as RDY output), while MODE = VDD enables write-read mode (WR-initiated conversion with INT handshake and pipelined capability). This dual-mode flexibility allows optimization for either simplicity (read mode) or speed (write-read mode) in different system architectures.