MAX4668CPE+

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Interface—Analog Switches, Multiplexers, Demultiplexers—have now become an integral part of modern electronics. A key component of these is MAX4668CPE+, which is a digital CMOS analog single-pole-double throw (SPDT) switch having extremely low RON of 0.4Ω. It is intended for use in portable telephone applications or any application requiring signals to be switched between multiple sources. This application note reviews the features, and application and operating principles of MAX4668CPE+.

The MAX4668CPE+ operates from a single 3V to 5.5V supply and requires just 6μA of quiescent current. This makes it ideal for battery-powered equipment. It has “break before make” switching action and offers high signal-handling performance with a low 0.4Ω RON, making it suitable for applications requiring high input impedance. The switch also offers 0.01pF of low capacitance and a low-noise architecture of 5nV√Hz.

The switch can handle signals over the frequency range of 0Hz to 50MHz, and supports both stereo and monaural applications. In a stereo application, it allows two inputs, A and B, to be selected. In monaural applications, a single input is selected. Its operation is based on the following:

When selecting A (or B) as the input, both A and B inputs are connected to the output. This is because the transistor connected to A (or B) is in the OFF state and is, therefore, disconnected from the output. The other transistor is in ON state and is connected to the output. When switching between A and B, the ON transistor is turned OFF and the OFF transistor is turned ON. This is done by driving the appropriate voltage to the appropriate control input. The output voltage at the selected input is then passed to the output.

The low-noise architecture of MAX4668CPE+ is designed to facilitate switching of signals without introducing additional noise. It also has very low input bias currents, allowing it to handle signals without distortions. The device has a common-mode input range of 390mV to the ground, which helps protect against minimal loss of dynamic range and signal-to-noise ratio when driving multiple sources with differential ECM signals.

The MAX4668CPE+ is available in 8-lead and 14-lead TDFN and PDIP packages, both of which are RoHS-compliant. It is also AEC-Q100 qualified, making it suitable for automotive applications. It can also be used in automotive audio systems, where it can be used to switch between various audio sources.

In conclusion, the MAX4668CPE+ is an ideal digital CMOS analog SPDT switch for use in portable telephones and for switching signals between multiple sources. Its low-noise architecture, low RON, and wide range of features make it suitable for a variety of applications.

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