MAX4908ETD+TCFD

Analog Switches - Special Purpose Overview

The MAX4908ETD+TCFD is a dual 3:1 clickless audio multiplexer manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +1.8V to +5.5V supply with a typical supply current of 2µA at VCC = +5.5V and 4µA at VCC = +2.7V. The device features a low on-resistance of 0.38Ω (typ) and supports negative signal throughput down to VCC - 5.5V. It includes internal shunt resistors on all input terminals for click-and-pop suppression, offers -70dB crosstalk and -80dB off-isolation at 20kHz, and has a total harmonic distortion of 0.02%. The component is housed in a 14-pin TDFN-EP package and operates over an extended temperature range of -40°C to +85°C.

Analog Switches - Special Purpose Feature Summary

• Negative-signal capability allows signals as low as VCC - 5.5V to pass through without distortion
• Internal shunt resistors on all input terminals automatically discharge capacitance to reduce audible click-and-pop sounds
• Break-before-make switching prevents momentary connection of old and new signal paths
• Digital control inputs accept up to +5.5V independent of the supply voltage

Analog Switches - Special Purpose Applications

• Cell Phones
• PDAs and Handheld Devices
• Notebook Computers
• MP3 Players

Analog Switches - Special Purpose Procurement Notes

Verify the specific ordering suffix 'CFD' against official manufacturer documentation to confirm tape-and-reel packaging details and RoHS compliance status. Ensure the part number matches the exact pinout and functional specifications required for the design. Cross-reference the datasheet revision history to validate the manufacturing date code and any potential updates to electrical characteristics or package dimensions prior to final procurement.

Analog Switches - Special Purpose Selection Notes

Select this component when designing audio routing circuits that require low distortion and minimal switching noise. The integrated shunt resistors make it suitable for applications where audible artifacts during source switching are critical. Verify that the system logic levels are compatible with the digital control inputs, which tolerate voltages up to +5.5V regardless of the analog supply voltage. Consider the 14-pin TDFN-EP package constraints for thermal management and board space.

Analog Switches - Special Purpose Part Context

This component belongs to the MAX4908/MAX4909/MAX4930/MAX4932 family of dual 3:1 clickless audio multiplexers. The MAX4908 variant is distinguished by having shunt resistors on all input terminals, unlike the MAX4909 which lacks them on X0/Y0, or the MAX4930/MAX4932 which have limited or no shunt resistors. All variants share the same core architecture, including negative-signal handling and low on-resistance characteristics.

Analog Switches - Special Purpose Replacement Considerations

Direct substitutes within the same family include the MAX4909ETD+T, MAX4930ETD+T, and MAX4932ETD+T. Note that these alternatives differ in the presence and location of internal shunt resistors, which affects click-and-pop suppression performance. Ensure the replacement variant meets the specific audio switching requirements regarding predischarge capabilities.