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  • MUX50x Analog Multiplexers

  • Created: Jul 12, 2016

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Analog signals can be produced in any form. These signals can be in a form of audio, current, voltage, light, pressure and etc. Electronic circuits or equipment that used several analog input signals at same time uses a multiplexer or sometimes called “multiplexor” to incorporate several signals into one output signal. The reference design is an analog multiplexer that uses MUX509IPWR from Texas Instrument. The evaluation board is an existing board previously feature MUX36D04. This board is compatible with MUX509IPWR. The MUX509IPWR is modern, complementary metal-oxide semiconductor (CMOS), analog multiplexers (MUXs) which offer differential 4:1 (8:2) channels.

The reference design works in dual supplies (±5V to ±18V) or a single supply (10V to 36V). The MUX509IPWR contains a four-channel, differential, analog mux. Each channel is turned ON or turned OFF based on the state of the address lines and enable pin. The enable pin can be pulled high and low. When pulled high, one of the switches is closed based on the state of the address lines. Pulling down this pin will cause all the switches to an open state regardless of what address line. The MUX509IPWR accepts a valid signal, which ranges from VSS to VDD. The pins S1A-S4A and S1B-S4B are source pins that can be configured either input or output pin. The MUX50x have special charge-injection cancellation circuitry that reduces the source-to-drain charge injection to as low as 0.3pC at VS = 0V, and ±0.6pC in the full signal range. This multiplexer also has a very low on and off leakage currents, thus allowing it to switch from high impedance sources with minimal error.

The application of this multiplexer can be found in factory automation and industrial process control, PLC, battery monitoring, analog input modules.



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