Analog Devices Inc./Maxim Integrated MAX4993EVB+T

Overview

The MAX4993EVB+T from Maxim Integrated is a double-pole/double-throw (DPDT) analog switch optimized for high-fidelity audio routing, featuring 0.3Ω typical on-resistance, 0.004% THD+N, and slow turn-on time to suppress click-and-pop in speaker/headset switching applications. It operates from a single +1.8V to +5.5V supply, includes an active-low enable input (EN), and is housed in a 10-pin UTQFN (1.4mm × 1.8mm) package rated for –40°C to +85°C.

For engineers reviewing the MAX4993EVB+T datasheet, MAX4993EVB+T pinout, MAX4993EVB+T application, or MAX4993EVB+T equivalent, this device is selected for low-distortion audio signal path control where DC-biased amplifiers, coupling capacitors, and speaker load management require controlled switching transients and minimal channel crosstalk.

Technical Context

The MAX4993EVB+T implements break-before-make DPDT switching with bidirectional analog signal paths across two independent poles. Its slow turn-on time (360ms typical at VCC = +2.7V) is engineered specifically to limit inrush current into speaker loads during power-up of DC-biased audio amplifiers, preventing audible transients without external RC networks.

It features an active-low EN input that places all channels in high-impedance state and reduces supply current to ≤1μA when asserted, while digital control is handled via a single CB input per pole. The device maintains 80dB PSRR and <1mΩ RON flatness over 0V–VCC analog swing, ensuring consistent signal integrity across voltage rails and temperature.

Key Specifications

Pinout & Package

MAX4993EVB+T is packaged in a 10-pin UTQFN (1.4mm × 1.8mm × 0.55mm) with wettable flanks, specified for –40°C to +85°C operation. Pin numbering follows standard JEDEC top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4994EVB+T and TSM1014IDT, the MAX4993EVB+T uniquely combines DPDT topology, integrated slow turn-on, active-low enable, and sub-0.3Ω RON in a 1.4mm × 1.8mm package-making it the only option for space-constrained, high-fidelity portable audio systems requiring autonomous click/pop suppression.

Availability

MAX4993EVB+T is available at Aetrix Electronics and suitable for cellular phone audio routing, portable MP3 player output selection, and wearables audio signal routing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX4993EVB+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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX4991–MAX4994 family was designed specifically for high-fidelity, low-voltage audio signal routing in portable electronics-emphasizing click/pop suppression, ultra-low distortion, and minimal board footprint without external passive components.

FAQ

What is the primary function of the EN pin on the MAX4993EVB+T?

The EN pin on the MAX4993EVB+T is an active-low enable input that places all analog switches in high-impedance state and reduces supply current to ≤1μA when driven high. This allows system-level power gating during standby or sleep modes. When EN is low, the MAX4993EVB+T operates normally under CB control. The pin accepts rail-to-rail logic levels and must be actively driven-not left floating-to ensure predictable behavior.

Does the MAX4993EVB+T support bidirectional analog signal flow?

Yes, the MAX4993EVB+T supports fully bidirectional analog signal flow on all NC_, NO_, and COM_ terminals. Its CMOS-based switch architecture allows any terminal to serve as input or output. However, click-and-pop reduction is only effective when COM1 or COM2 is used as the output node connected to the speaker load, as the slow turn-on timing is referenced to COM-terminal voltage slew rate.

How does the slow turn-on time of the MAX4993EVB+T reduce click-and-pop noise?

The MAX4993EVB+T achieves click-and-pop reduction by extending turn-on time to 360ms (typical at VCC = +2.7V), which limits the rate of current rise (dI/dt) into speaker coupling capacitors during amplifier power-up. This prevents large transient currents that cause mechanical diaphragm displacement and audible pop. The effect requires COM_ to be connected directly to the speaker load and is ineffective if NO_ or NC_ is used as the output node.

What is the maximum continuous current rating for the MAX4993EVB+T analog channels?

The MAX4993EVB+T supports ±350mA continuous current through each COM_, NC_, or NO_ terminal, with peak ratings of ±700mA (1ms, 50% duty cycle) and ±1.5A (1ms, 10% duty cycle). These ratings assume proper PCB thermal design and operation within the –40°C to +85°C temperature range. Exceeding these limits risks permanent damage due to junction overheating, especially in the 10-pin UTQFN package with θJA = 143.1°C/W.

Can the MAX4993EVB+T be used with a 1.8V supply, and what performance trade-offs occur?

Yes, the MAX4993EVB+T is fully specified for operation down to +1.8V supply. At 1.8V, on-resistance increases to ~0.5Ω (vs. 0.3Ω at 3V), THD+N remains ≤0.004%, and turn-on time extends beyond 360ms. PSRR degrades slightly but stays >75dB. All digital inputs (CB, EN) remain compatible with 1.8V logic. System designers should verify RON impact on insertion loss and ensure adequate headroom for worst-case audio signal swing.