Analog Devices Inc./Maxim Integrated MAX399CSE+

Overview

The MAX399CSE+ from Maxim Integrated is a dual 4-channel precision CMOS analog multiplexer designed for bidirectional signal routing in low-voltage, high-accuracy systems. It delivers <100Ω on-resistance (typ. 60Ω), <6Ω channel-to-channel R_ON matching, <5pC charge injection, rail-to-rail analog signal handling (±4.5V with ±5V supplies), and operates from +3V to +15V single or ±3V to ±8V dual supplies - enabling use in battery-powered test equipment and military comms front-ends.

For engineers reviewing the MAX399CSE+ datasheet, MAX399CSE+ pinout, MAX399CSE+ application, or MAX399CSE+ equivalent, key selection criteria include guaranteed on-resistance flatness (<11Ω), sub-250ns transition time, NO/COM off-leakage <2.5nA at +85°C, TTL/CMOS logic compatibility, and pin compatibility with DG409/DG509A for drop-in upgrades in legacy ATE and guidance systems.

Technical Context

The MAX399CSE+ implements a dual independent 4:1 analog multiplexer architecture with separate COMA/COMB outputs and shared address/control lines (A0, A1, EN). Its silicon-gate CMOS process ensures low charge injection (<5pC) and ESD robustness (>2000V), critical for sample-and-hold integrity and system reliability in ungrounded or floating-signal environments.

It supports both single-supply (+3V to +15V, V− tied to GND) and bipolar-supply (±3V to ±8V) operation without performance degradation. Logic inputs are fully compatible with TTL and CMOS thresholds (V_IL ≤ 0.8V, V_IH ≥ 2.4V), and enable-controlled break-before-make switching prevents signal shorting during channel transitions.

Key Specifications

Pinout & Package

The MAX399CSE+ is housed in a 16-pin narrow-body SOIC (SOIC-N) package (package code S16-1), 0.150" wide, with standard lead pitch (1.27mm) and exposed pad not present (QFN variant has EP; SOIC-N does not).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Compared with MAX399EEE+, the MAX399CSE+ offers identical electrical performance at lower cost and reduced thermal qualification overhead for commercial-grade systems; compared with DG409DN+, it provides superior precision, lower distortion, and guaranteed parametric limits essential for metrology and defense applications.

Availability

MAX399CSE+ is available at Aetrix Electronics and suitable for automatic test equipment, military communications systems, heads-up displays, and low-voltage data-acquisition systems requiring stable component supply and long-term sourcing continuity.

Supply support for MAX399CSE+ 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX399 belongs to Maxim's precision analog multiplexer product line, engineered for low-distortion, low-leakage signal routing in test, measurement, and ruggedized embedded systems where accuracy and reliability are non-negotiable.

FAQ

What is the maximum analog signal range supported by the MAX399CSE+?

The MAX399CSE+ supports an analog signal range of ±4.5V when operated with ±5V supplies, and rail-to-rail operation from V− to V+. With +5V single supply (V− = GND), the range is 0V to +4.5V. This is confirmed in the Electrical Characteristics table under "Analog Signal Range" for dual-supply conditions, and enables direct interfacing with most op-amps and ADCs without level-shifting circuitry. The MAX399CSE+ maintains low on-resistance and flatness across this full range.

Is the MAX399CSE+ pin-compatible with the DG409?

Yes, the MAX399CSE+ is explicitly pin-compatible with the DG409 and DG509A, as stated in the Features section and Pin Configurations diagram. Both devices use the same 16-pin SOIC layout with identical pin functions: A0/A1 address inputs, EN enable, V+/V− supplies, GND, COMA/COMB, and N01A–N04A/N01B–N04B analog I/O. This allows direct replacement in existing designs without PCB modification - a key advantage highlighted in the datasheet's "Pin Compatible" feature bullet.

What is the typical on-resistance matching between channels for the MAX399CSE+?

The MAX399CSE+ guarantees ΔR_ON (channel-to-channel on-resistance matching) of less than 6Ω, as specified in the Electrical Characteristics table under "ΔRON" for dual-supply conditions. This tight matching ensures consistent gain and minimal crosstalk-induced errors when routing multiple sensor or calibration signals through different channels - critical for precision instrumentation and automated test systems where ratio-metric accuracy matters.

Does the MAX399CSE+ support single-supply operation?

Yes, the MAX399CSE+ supports single-supply operation from +3V to +15V. In this mode, V− must be connected to GND. The datasheet provides dedicated Electrical Characteristics tables for +5V and +3V single-supply operation, confirming parameters including R_ON, leakage, and switching times. Single-supply use simplifies power design in battery-operated systems like portable radios and handheld test gear, while retaining rail-to-rail signal handling capability.

What is the charge injection specification for the MAX399CSE+ and why does it matter?

The MAX399CSE+ guarantees charge injection of less than 5pC (typical 2pC), as verified in the Electrical Characteristics table and Typical Operating Characteristics plot (toc07). This low charge injection minimizes voltage glitches on sampling capacitors in sample-and-hold circuits and switched-capacitor filters - for example, inducing <2mV error on a 1nF hold capacitor. It is a key enabler for high-resolution data acquisition where signal integrity during switching is critical to maintaining DC accuracy and settling performance.