CMOS Analog Multiplexer for Reliable Signal Routing: Introducing the ET74HC4852

Modern electronic systems often need to route several analog signals while keeping the circuit compact and maintaining signal integrity. Whether the application involves audio signals, data acquisition, portable electronics, or battery-powered equipment, designers need an efficient way to select between multiple signal paths.

A CMOS Analog Multiplexer provides a practical solution by allowing multiple analog inputs to share common signal paths under digital control. For designs that require two independent groups of four channels, ETEK’s ET74HC4852 combines flexible routing with low on-resistance, low crosstalk, and strong off-isolation.

What Does a CMOS Analog Multiplexer Do?

A CMOS Analog Multiplexer acts as an electronically controlled signal selector. Instead of using separate switching components for every signal path, a multiplexer allows the system controller to determine which input or output channel should be connected at a given time.

The ET74HC4852 integrates two 4-channel multiplexers into a single device. This dual-channel architecture makes it possible to manage two groups of signals while reducing the number of discrete components required in the design.

Operating from a 2.5V to 5.5V single power supply, the device is suitable for many low-voltage electronic systems. Its digital inputs also support 1.8V logic control, making interfacing with low-voltage processors and controllers easier.

Why Signal Integrity Matters in Analog Multiplexing

Selecting channels is only part of the job of a multiplexer. For applications involving audio, video, sensing, or measurement signals, engineers also need to consider what happens to the signal as it passes through the switch.

One important parameter is on-resistance (RON). Excessive resistance in the active signal path can contribute to unwanted losses or affect circuit behavior. The ET74HC4852 provides a typical on-resistance of 44Ω at VCC = 5V, together with low on-resistance flatness.

This helps the CMOS Analog Multiplexer provide predictable switching performance across the selected signal path.

Low Crosstalk Between Signal Channels

When several signals are routed through the same IC, unwanted coupling between channels can become a concern.

The ET74HC4852 achieves -90dB crosstalk at 1MHz. This means interference from one signal path into another is strongly suppressed, helping preserve separation between channels.

Such performance is particularly valuable when different signals must coexist in a compact circuit, including audio and video signal-routing applications.

High Off-Isolation for Cleaner Signal Routing

A channel that is switched off should have as little influence as possible on the active signal path. This is where off-isolation becomes important.

The ET74HC4852 offers -85dB off-isolation at 1MHz with a 50Ω load, reducing unwanted signal feedthrough from inactive channels. Combined with its low off-leakage current, this characteristic helps maintain clear separation between selected and unselected paths.

For designers, the combination of low crosstalk and high off-isolation provides an important advantage when signal integrity is a priority.

Designed for Audio and Other Analog Signals

Signal distortion is another consideration when choosing an analog multiplexer, particularly when the device is used in an audio path.

The ET74HC4852 specifies 0.7% distortion with a 600Ω load across 20Hz to 20kHz. Its electrical characteristics therefore make it suitable for applications where analog signals need to be switched between multiple sources or destinations.

Beyond audio and video routing, the ET74HC4852 is specified for applications including portable equipment, sample-and-hold circuits, data-acquisition systems, battery-powered systems, and automotive applications.

Flexible Integration Across Different Designs

The ET74HC4852 operates across an ambient temperature range of -40°C to +85°C, allowing it to support electronics used under varying operating conditions.

Designers can also select from several Green package options:

– QFN16 (3mm × 3mm)

– TSSOP16

– SOP16

This packaging flexibility allows engineers to balance PCB space, assembly requirements, and existing board layouts when incorporating the device into a new design.

ET74HC4852 for Multi-Channel Analog Signal Switching

Choosing a CMOS Analog Multiplexer requires more than simply matching the number of channels. Supply compatibility, logic levels, on-resistance, channel isolation, crosstalk, distortion, and package options can all influence the final system performance.

With its dual 4-channel architecture, 2.5V–5.5V supply range, 1.8V logic compatibility, 44Ω typical on-resistance, -90dB crosstalk, and -85dB off-isolation, the ET74HC4852 provides a balanced solution for multi-channel analog signal routing.

For engineers developing portable electronics, audio/video systems, data-acquisition equipment, or other signal-routing applications, ETEK offers the ET74HC4852 CMOS Analog Multiplexer as a compact option for reliable analog switching.

👉View the ET74HC4852 product page and technical information on ETEK

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