SJM190BXA

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The SJM190BXA is an interface analog switch, multiplexer and demultiplexer all-in-one chip. It supports functional features such as voltage range from wide to narrow, low power inputs and outputs, adjustable current sources, high input impedance and the ability to handle up to 15 pins in a single device. In addition, the device offers efficient switching speed and excellent signal integrity for an extended range of applications.

Application Field

The SJM190BXA is ideal for applications that require high input impedance, including switching, multiplexing, and demultiplexing of analog signals. It is an important component in applications such as audio and communication systems (ADCs, DACs, and RF transceiver boards), automotive audio systems (anti-lock brakes and engine control modules) and LCD/LED displays, as well as industrial and medical monitoring devices. The device can also be used in larger systems such as automotive telematics, military and aerospace systems, test and measurement equipment, etc.

Working Principle

The SJM190BXA is composed of two bidirectional analog switches with internal signals switching, multiplexing and demultiplexing controls. The analog switches feature an input impedance of > 120KΩ, an adjustable current source of up to 15mA, and a voltage range from wide to narrow (Vh > Vl) with a linear on/off transition. The multiplexing function allows a single signal to drive multiple channels with different signals. The demultiplexing function allows multiple signals to drive a single channel via varying thresholds.

When multiple supply voltage is available, such as 3.3V and 5V, the SJM190BXA can make use of the different levels to achieve low power input and output levels. Additionally, the device has a low on-resistance channel isolation of less than 1/20th of the input/output source/sink current, and its switching speed is fast enough for most applications without causing signal integrity issues. As an extra benefit, the accuracy and linearity of the device’s control logic is excellent, resulting in predictable and consistent control.

Conclusion

The SJM190BXA is a versatile analog switch, multiplexer, and demultiplexer, capable of switching and routing analog signal of varying voltages, current sources and current amplitudes. Its low power inputs and outputs and adjustable current sources make it ideal for applications, such as audio and communication systems, automotive audio systems and LCD/LED displays, as well as industrial and medical monitoring devices. In addition, its excellent linearity, high input impedance and switching speed make it an ideal choice for an extended range of applications in automotive, military and aerospace, test and measurement equipment and so on.

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