Analog Devices Inc./Maxim Integrated MAX113EAG+

Overview

MAX113EAG+ from Maxim Integrated is a +3V, 4-channel, 8-bit analog-to-digital converter (ADC) using half-flash architecture to achieve 1.8µs conversion time (400ksps), 1µA power-down current, and ratiometric operation via internal track/hold and REF+/REF− inputs. It interfaces directly to 8-bit parallel microprocessor buses without external logic and targets battery-powered data acquisition systems.

For engineers reviewing the MAX113EAG+ datasheet, MAX113EAG+ pinout, MAX113EAG+ application, or MAX113EAG+ equivalent, key selection considerations include its 24-pin SSOP package, -40°C to +85°C industrial temperature range, single-supply +3.0V to +3.6V operation, and support for burst-mode sampling with sub-900ns wake-up from power-down.

Technical Context

The MAX113EAG+ implements a two-stage half-flash ADC architecture: a 4-bit flash section generates the MSBs and drives an internal DAC to produce a residue voltage, which is then quantized by a second 4-bit flash section to yield the full 8-bit result. This structure enables high speed with low power and only 15 comparators.

It features dual digital interface modes-read mode (MODE = 0) and write-read mode (MODE = 1)-with configurable channel selection via A0–A2, latched three-state outputs (D0–D7), and asynchronous interrupt (INT) signaling. The PWRDN pin controls full device shutdown, reducing VDD current to 1µA while preserving state for <900ns recovery into track mode.

Key Specifications

Pinout & Package

MAX113EAG+ is housed in a 24-pin shrink small-outline package (SSOP), 0.154" wide, with 0.025" pitch and exposed pad not electrically connected. Pin 1 is marked by a dot; pin numbering follows standard SSOP convention (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel, 8-bit, low-power ADC applications.

Compared with MAX113CAG+, the MAX113EAG+ offers wider temperature operation essential for industrial deployment; compared with ADS7822U, it provides native 8-bit parallel interface and true ratiometric reference architecture-critical for precision bridge-based sensing without added signal conditioning.

Availability

MAX113EAG+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial health-monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX113EAG+ 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.

The MAX113EAG+ belongs to Maxim's legacy precision data-acquisition product line, designed specifically for low-power, microprocessor-centric systems needing fast, accurate, and easy-to-interface ADCs in compact packages.

FAQ

What is the operating temperature range of the MAX113EAG+?

The MAX113EAG+ is specified for operation from -40°C to +85°C, making it suitable for industrial and extended-environment applications. This rating is confirmed in the Ordering Information table, where "E" grade denotes the -40°C to +85°C range, and "AG" suffix indicates the 24-pin SSOP package. The device maintains full electrical performance-including 1.8µs conversion time and ≤±1 LSB total unadjusted error-across this entire range.

Does the MAX113EAG+ require an external clock source?

No, the MAX113EAG+ does not require an external clock. Its half-flash conversion architecture uses internally generated timing, allowing autonomous operation once triggered by RD or WR. This eliminates clock routing complexity and jitter concerns. The device achieves consistent 1.8µs conversion time across its +3.0V to +3.6V supply range without external timing components.

How does the ratiometric reference configuration work on the MAX113EAG+?

The MAX113EAG+ implements ratiometric operation through dedicated REF+ and REF− pins: the full-scale code corresponds to (REF+ − REF−), and zero-scale corresponds to REF−. When both REF+ and REF− are derived from the same source (e.g., a resistive sensor bridge excited by VDD), supply variations cancel out. This configuration is explicitly supported in the Electrical Characteristics table and Functional Diagram, and requires no external components beyond decoupling capacitors.

Can the MAX113EAG+ interface directly to an 8-bit microprocessor data bus?

Yes, the MAX113EAG+ features latched, three-state D0–D7 outputs that connect directly to an 8-bit parallel microprocessor data bus without external buffers or logic. In read mode (MODE = 0), RD and CS control data access and RDY status; in write-read mode (MODE = 1), WR initiates conversion and RD reads results. This capability is documented in the Digital Interface section and confirmed by the pin descriptions for D0–D7, RD, WR/RDY, CS, and MODE.

What is the minimum acquisition time (tACQ) required before starting a conversion on the MAX113EAG+?

The minimum acquisition time tACQ for the MAX113EAG+ is 450 ns, as specified in the Timing Characteristics table under "Minimum Acquisition Time" for all grades at TA = TMIN to TMAX. This parameter defines the duration the track/hold circuit must sample the selected analog input before conversion begins. Exceeding this time ensures full settling; shorter intervals risk incomplete acquisition and increased error, especially with higher source impedances.