MAX4051EPE

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A MAX4051EPE is a monolithic CMOS analog multiplexer/demultiplexer that switches single-ended signals. It can select one of four single-ended signals and directs it to a single output, or alternatively, it can direct a single input to any one of four outputs. The device has low on-capacitance of 0.3pF, making it compatible with high frequency, as well as low voltage signals such as RS232, RS485, and others.

The MAX4051EPE is available in the very tiny 3 x 3mm ThinSOT package. This device can operate over a wide temperature range of -40°C to +125°C and is specified for both commercial and automotive temperature range. It can switch up to 6Vp-p differential signals and can operate with input signals in the 0V to V dD range, which allows direct interface with logic.

Application fields of MAX4051EPE include: digital audio, robotics, communications, data acquisition, timing and control, instrumentation, medical and industrial control, and many others. It has excellent isolation and low leakage current, making it suitable for ultra-low power applications.

The working principle of MAX4051EPE is straightforward. Its enable pin (EN) is used to enable the multiplexer/demultiplexer. When EN is logic High, input data will be directed to the single output port based on the values of the "A" and "B" select pins. When EN is logic Low, the output pins will be disabled, and all outputs will be in a High impedance state. When used as a demultiplexer, EN is also used to select whether the single input is directed to the one of four single outputs or not.

The following is the electrical diagram of MAX4051EPE:

As can be seen, the quad switch consists of two CMOS digital signal lines, A and B. These two lines are used to select which one of the four combines signal lines, Z1-Z4, will be connected to the single output, Y. The selection process is as following: when A and B both logic High, Z1 is selected, when A is logic Low and B is logic High, Z2 is selected, when A is logic High and B is logic Low, Z3 is selected, when A and B both is logic Low, Z4 is selected.

The MAX4051EPE uses a single supply voltage, making it suitable for portable, battery-operated applications. It can be used in low-profile, space-limited applications, as it occupies only 3 x 3mm of board area. The device is also very power-efficient, as it consumes only 40µA of supply current and its low on-resistance of 40Ω ensures minimal erroneous switching.

In summary, the MAX4051EPE is a perfect analogy multiplexer/demultiplexer solution which offers superior performance, power efficiency and ultra-low power applications. It is ideal for any application which requires low on-capacitance, wide temperature operation, and single supply voltage.

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