SJM187BIC01

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Analog switches, multiplexers, and demultiplexers are essential components in the construction of electronic circuits for their ability to select, combine, or split multiple signal lines. Among these components, the SJM187BIC01, 1:8 CDs multiplexer/demultiplexer, is one of those common ones in use. The purpose of this article is to discuss the application field and working principle of the SJM187BIC01.

The SJM187BIC01 is designed to multiplex/demultiplex analog signals in 1:8 pairs and has two non-overlapping, complementary CMOS control inputs. Typical applications of the device include switching, video crosspoint, audio crosspoint, and AD/DA multiplexing and demultiplexing. Besides, together with other multiplexers, it is also used in amplifiers, microphones, and line drivers.

The SJM187BIC01 has two groups of input pins: A and B. To demultiplex the signal from group A to group B, control input "A" is set to "High" and control input "B" is set to "Low". To multiplex the signal from group B to group A, "A" is set to "Low" and "B" is set to "High". The switching and multiplexing functions are accomplished by using CMOS logic instead of traditional switches. The device can provide 8 paths in each direction, and the switching and multiplexing are done by setting the "A" and "B" input pins to either "High" or "Low" states.

The switching characteristic of the SJM187BIC01 can be described by several parameters, including on resistance (RON), off capacitance (COFF), switching time (tsw), switching voltage drop (VDROP), and logic to off (off1 & off2). The RON parameter describes the resistance of the switch in the "on" state, which determines the power dissipation of the device as well as the current flow through it. The COFF parameter describes the capacitance of the switch in the "off" state, which also affects the current flow through the device. The tsw value describes how fast the switch can switch from one state to another. The VDROP parameter describes how much voltage is dropped by the switch when it is in the "on" state. Finally, the off1 & off2 parameters describe how much logic is needed in order to switch the switch from "on" to "off" state.

In conclusion, the SJM187BIC01 is an excellent multiplexer/demultiplexer device, due to its wide range of applications in amplifiers, microphone systems, line drivers, and video crosspoints. The operation of the device is based on controlling the logic state of the control pins "A" and "B", and it is governed by a set of parameters like on resistance, off capacitance, switching time, switching voltage drop, and logic to off. This device is able to provide 8 paths in each direction, and it is ideal for switching and multiplexing signals.

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