ADG419TQ

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The ADG439TQ series are interface-analog switches, multiplexers and demultiplexers from Analog Devices. This device contains four independent single pole, single throw analog switches in a small 16-pin SSOP package, being suitable for both commercial and industrial temperature ranges.

The main application areas for these devices are in the industrial control and test and measurement fields, such as medical instrumentation, high speed A/D converters, and portable data acquisition. In addition, these devices can be used in the automotive, military, and professional audio field.

The ADG439TQ series are designed to operate from a single +5V power supply and draw no more than 30 μA of operating current. The maximum on resistance of the ADG439TQ is typically 110 Ω, and the switch can handle input voltages up to 5.5V, making it suitable for use in a wide range of applications. All paths are quickly disabled when the EN line is driven low. The turn-on/turn-off time is typically 8 and 12 μs with a 5V supply.

The ADG439TQ switches are unidirectional; they require manual latching and can be driven independently using the Enable (EN) control line. This control line can be used to turn on and off the individual switches of the device, as well as controlling the switching timing. In addition, the control line can be used to provide hysteresis and prevent false triggering. To use the ADG439TQ in a system, the EN line must be activated to turn on the device and then left at a logic-high level for the data signals to be passed through.

The working principle of the ADG439TQ is based on the concept of analog multiplexing and demultiplexing. The device contains four independent single pole single throw (SPST) analog switches. These are controlled by an enable (EN) control line that is used to turn the switches on or off. The device is designed to pass analog signals from a single device output to multiple device inputs (multiplexing) or from multiple device outputs to a single device input (demultiplexing). With the use of external resistors and capacitors, the device can be used as a multiplexer, demultiplexer, or as a combination of both.

The device is also equipped with internal protection circuitry to protect against false triggering and Electrostatic Discharge (ESD) damage. This is accomplished through the use of internal diodes, which protect the device from overvoltage. The device is also equipped with an ESD-protection diode across all terminals, which adds an extra layer of protection from ESD events.

In conclusion, the ADG439TQ series from Analog Devices is a highly versatile and reliable device for use in a wide range of applications. Its four independent SPST switches give the device the flexibility to be used for multiplexing, demultiplexing, or a combination of both. Its protective circuitry ensures that the device is protected against false triggering and ESD damage while its low power consumption makes it perfectly suitable for battery powered applications.

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