MAX4908ETD+T

On-State Resistance (Max):	750 mOhm
Base Part Number:	MAX4908
Supplier Device Package:	14-TDFN-EP (3x3)
Package / Case:	14-WFDFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Features:	Break-Before-Make, Clickless
-3db Bandwidth:	--
Voltage - Supply, Dual (V±):	--
Voltage - Supply, Single (V+):	1.8 V ~ 5.5 V
Series:	--
Number of Channels:	2
Switch Circuit:	SP3T
Multiplexer/Demultiplexer Circuit:	3:1
Applications:	Audio
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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MAX4908ETD+T Interface Analog Switches: Special Purpose Application and Working PrincipleAnalog switches are devices that control signals in the analog domain. Special purpose analog switches, such as the MAX4908ETD+T, are used for applications where digital signals are not suitable for the task. This paper outlines the application field and workings of the MAX4908ETD+T interface analog switch and why it is classified as a special purpose analog switch.Application FieldThe MAX4908ETD+T is a low-voltage, low-power, low-dropout, high-isolation, and monolithic analog switch. This makes it suitable for a variety of applications ranging from small handheld devices, industrial control and automation, automotive, and medical systems, among others.For example, it can be used to switch power between two inputs or two outputs, or even both, in a bidirectional fashion, reducing complexity and eliminating additional dedicated gate-drive and control components. This makes the MAX4908ETD+T ideal for replacing mechanical relays and other analog switches, offering improved performance and reliability.Additionally, the MAX4908ETD+T enables the integration of safety functions in automotive and medical designs, providing reliable isolation between conflicting electrical circuits, such as between digital and analog, ground and power, and interfering and sensitive signals.Working PrincipleThe MAX4908ETD+T works in a two-stage structure. It consists of two separate PIN diodes and an internal transistor, each connected to the data line of the two ends of the switch, respectively. When the two PIN diodes are opened or closed, the current flowing through the internal transistor varies accordingly, which in turn opens or closes the switch.The main principle behind the MAX4908ETD+T is that both the data line of the switch and the internal transistor are connected to each other, so that the electric current running through one side can be modulated by the voltage on the other side. When the voltage of the data line belonging to one end is higher than the voltage of the data line belonging to the other end, the electric current runs through the switch from the high voltage side to the low voltage side. When their voltage is equal, the electric current is blocked.This operation ensures that the logic control signal is able to turn the switch on or off very quickly and accurately. It also ensures that the switching characteristics of the MAX4908ETD+T can be set precisely according to the needs of the application, by providing the user with complete control over the switching characteristics, such as the voltage threshold, current levels, and so on.ConclusionThe MAX4908ETD+T is a special purpose analog switch with a wide range of applications, from handheld to automotive and medical devices. Its two-stage structure and special design principles provide users with both accurate and reliable switching operations, making it an ideal choice for modern systems.

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