Analog Devices Inc./Maxim Integrated MAX4718EUB

Overview

The MAX4718EUB from Maxim Integrated is a dual SPDT analog switch featuring one 4.5Ω (max) low-R_ON channel and one 20Ω (max) high-R_ON channel, operating from a single +1.8V to +5.5V supply with rail-to-rail signal handling, <80ns turn-on time, and 300MHz bandwidth-designed for USB 1.1 signal routing and headphone switching in portable audio systems.

For engineers reviewing the MAX4718EUB datasheet, MAX4718EUB pinout, MAX4718EUB application, or MAX4718EUB equivalent, key selection criteria include R_ON mismatch (<0.4Ω), break-before-make timing (1ns), on-capacitance (15pF), off-isolation (-55dB @10MHz), and +1.8V logic compatibility-critical for low-voltage, high-fidelity analog signal path integrity in space-constrained designs.

Technical Context

The MAX4718EUB integrates two independent SPDT switches on a single BiCMOS die: Switch 1 delivers low distortion (0.03% THD) and tight R_ON matching (0.3Ω max at +3V) for precision signal paths, while Switch 2 provides higher R_ON (20Ω max) with guaranteed flatness (1.2Ω) and matching (0.4Ω) optimized for auxiliary routing where insertion loss tolerance is relaxed.

Its break-before-make architecture prevents signal shorting during state transitions, supported by fast t_ON/t_OFF (80ns/40ns max at +2.7V) and ultra-low differential skew (2ns max), enabling reliable USB 1.1 data switching (12Mbps) without packet corruption or timing jitter accumulation.

Key Specifications

Pinout & Package

The MAX4718EUB is housed in a 10-pin µMAX package (3mm × 3mm), with exposed pad grounded for thermal stability and EMI reduction. Pin numbering follows standard µMAX layout with IN1/IN2 controlling respective SPDTs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4717EUB and MAX4617EUB, the MAX4718EUB uniquely combines asymmetric R_ON channels (4.5Ω + 20Ω) and 300MHz bandwidth, enabling simultaneous high-fidelity routing and auxiliary switching in compact portable designs without requiring two separate ICs.

Availability

MAX4718EUB is available at Aetrix Electronics and suitable for USB 1.1 interface design, portable audio system development, and low-voltage data-acquisition multiplexing requiring stable component supply across industrial temperature ranges (-40°C to +85°C).

Supply support for MAX4718EUB 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 and mixed-signal ICs for power, interface, sensing, and timing applications in demanding environments.

The MAX4717/MAX4718 product line targets low-voltage, high-bandwidth analog signal routing in portable consumer electronics-specifically engineered to replace mechanical relays and discrete MOSFET arrays in USB and audio subsystems.

FAQ

What is the maximum supply voltage rating for the MAX4718EUB?

The MAX4718EUB has an absolute maximum supply voltage (V+) of +6.0V, but its specified operational range is +1.8V to +5.5V. Operating beyond +5.5V risks permanent damage per Absolute Maximum Ratings. The MAX4718EUB maintains guaranteed R_ON, timing, and isolation performance only within the +1.8V to +5.5V range, with typical characterization at +3.0V and +5.0V.

Does the MAX4718EUB support rail-to-rail analog signal switching?

Yes, the MAX4718EUB supports rail-to-rail analog signal handling: its analog terminals (COM_, NO_, NC_) operate from 0V to V+, enabling full-swing signal transmission without clipping. This is confirmed in the Electrical Characteristics table under "Analog Signal Range" and leveraged in USB 1.1 and audio applications where preserving signal headroom is critical. The MAX4718EUB achieves this via BiCMOS process optimization and internal level-shifting circuitry.

How does the MAX4718EUB's dual R_ON architecture benefit system design?

The MAX4718EUB's dual R_ON architecture-featuring one 4.5Ω (max) SPDT and one 20Ω (max) SPDT-enables optimized signal routing: the low-R_ON channel preserves signal integrity in high-speed paths (e.g., USB D+/D-), while the higher-R_ON channel provides superior off-isolation (-55dB) and lower charge injection for auxiliary functions (e.g., microphone switching). This eliminates the need for two separate switches, reducing PCB area and BOM count. The MAX4718EUB thus delivers functional integration without compromising either performance domain.

What is the logic voltage compatibility of the MAX4718EUB's digital inputs?

The MAX4718EUB's IN1 and IN2 inputs are +1.8V CMOS logic compatible, with VIH = +1.4V (min) and VIL = +0.5V (max) at +3.0V supply, and VIH = +2.0V (min)/VIL = +0.8V (max) at +5.0V supply. Critically, the inputs tolerate voltages up to +5.5V regardless of V+, allowing direct interfacing with 5V microcontrollers even when the MAX4718EUB operates from a 1.8V or 3.3V rail. This simplifies level-shifting requirements in mixed-voltage systems.

Can the MAX4718EUB be used in audio applications requiring low THD?

Yes, the MAX4718EUB delivers 0.03% total harmonic distortion (THD) at 2V_P-P into 600Ω, verified at +25°C with +3.0V supply. This performance stems from its low R_ON flatness (1.2Ω max), tight R_ON matching (0.4Ω max), and symmetrical switch architecture-key for minimizing harmonic generation in line-level and headphone driver paths. The MAX4718EUB's THD specification is explicitly measured and guaranteed, making it suitable for high-fidelity portable audio routing where distortion must remain below audible thresholds.