Analog Devices Inc./Maxim Integrated MAX4992ELB+T

Overview

The MAX4992ELB+T from Maxim Integrated is a dual single-pole/double-throw (SPDT) analog switch optimized for high-fidelity audio routing in portable devices. It operates from a single +1.8V to +5.5V supply, delivers 0.3Ω typical on-resistance, 0.004% THD+N, and 1.2µA typical supply current, enabling low-distortion speaker/headset source switching in battery-constrained applications.

For engineers reviewing the MAX4992ELB+T datasheet, MAX4992ELB+T pinout, MAX4992ELB+T application, or MAX4992ELB+T equivalent, key selection criteria include its absence of slow turn-on (unlike MAX4991), lack of enable input (unlike MAX4993/MAX4994), dual SPDT topology, UTQFN-10 package, and suitability for DC-bias audio amplifier interfaces requiring minimal click-and-pop mitigation overhead.

Technical Context

The MAX4992ELB+T implements break-before-make switching with bidirectional signal paths across two independent SPDT channels. Each channel features NC1/NO1/COM1 and NC2/NO2/COM2 terminals, controlled by separate digital inputs CB1 and CB2, with no shared enable line.

It lacks the slow turn-on circuitry of MAX4991/MAX4993 and the active-low EN input of MAX4993/MAX4994, resulting in fast 20µs typical turn-on time and rail-to-rail logic compatibility. Its R_ON flatness of 1mΩ and PSRR of 80dB ensure stable audio performance across V_COM from 0V to V_CC.

Key Specifications

Pinout & Package

Package: 10-pin UTQFN (1.4mm × 1.8mm × 0.55mm), RoHS-compliant, exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4991ELB+T, the MAX4992ELB+T trades click-and-pop suppression for 10,000× faster switching, making it ideal for dynamic source selection; versus TMUX1574RSVR, it delivers superior audio performance with lower R_ON, flatter response, and proven THD+N compliance in portable audio designs.

Availability

MAX4992ELB+T is available at Aetrix Electronics and suitable for portable audio systems, cellular handsets, and wearable device designs requiring stable component supply, guaranteed long-term sourcing, and full traceability.

Supply support for MAX4992ELB+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, automotive, and consumer applications.

The MAX4991–MAX4994 family targets portable audio signal routing, delivering ultra-low R_ON, high PSRR, and THD+N performance in miniature UTQFN packages for space- and power-constrained devices.

FAQ

What is the primary function of the MAX4992ELB+T in an audio system?

The MAX4992ELB+T serves as a dual SPDT analog switch that routes high-fidelity audio signals between multiple sources and destinations-such as selecting between speaker and headset outputs-while maintaining low distortion (0.004% THD+N), minimal insertion loss (0.3Ω R_ON), and ultra-low power consumption (1.2µA typical). Its design ensures clean, glitch-free switching in portable devices powered from 1.8V to 5.5V rails.

Does the MAX4992ELB+T support slow turn-on for click-and-pop reduction?

No, the MAX4992ELB+T does not include slow turn-on circuitry. Unlike the MAX4991ELB+T, it features fast 20µs typical turn-on time and is intended for applications where rapid switching is required and external click-and-pop mitigation (e.g., software-controlled ramping or hardware RC networks) is implemented. The MAX4992ELB+T datasheet explicitly confirms absence of this feature in the Ordering Information table.

What are the logic voltage thresholds for CB1 and CB2 inputs on the MAX4992ELB+T?

The MAX4992ELB+T specifies VIH = 1.4V minimum and VIL = 0.5V maximum for both CB1 and CB2 digital control inputs. This allows reliable interfacing with 1.8V, 2.5V, 3.3V, and 5V logic families. Input leakage remains below ±1µA across temperature, ensuring minimal loading on driving GPIOs. These values are confirmed in the Electrical Characteristics table under "DIGITAL I/O" parameters.

Can the MAX4992ELB+T be used in bidirectional audio signal paths?

Yes, the MAX4992ELB+T supports fully bidirectional analog signal flow across all terminals (NO1/NC1/COM1 and NO2/NC2/COM2). Its CMOS-based architecture allows any pin to serve as input or output, provided voltage levels remain within 0V to V_CC. However, click-and-pop reduction functionality-though not present in MAX4992ELB+T-is only effective when COM_ is used as the output node, per the device's Detailed Description section.

What is the thermal performance of the MAX4992ELB+T in its UTQFN package?

The MAX4992ELB+T in the 10-pin UTQFN package has a junction-to-ambient thermal resistance (θ_JA) of 143.1°C/W and junction-to-case (θ_JC) of 20.1°C/W, measured per JEDEC JESD51-7 on a 4-layer board. At maximum continuous power dissipation of 559mW (at TA = +70°C), the junction temperature rise remains within safe limits for operation across -40°C to +85°C ambient, assuming standard PCB copper pour practices.