DG221BDY-E3

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DG221BDY-E3 (DG221) is an analog switch IC, designed for applications such as audio, motor control, and data communications. It provides 2 single-pole double-throw (SPDT) or 2 buffered amplifier switches, with a maximum break-before-make time of 8 ns. This makes it suitable for use in ultra-high-speed switching applications in communication and audio systems.

The DG221 features an input on-resistance (Ron) of 10 ohms, which minimizes signal distortion. It also offers an input sensitivity that is fairly low, making it suitable for use in systems with low-power signals. The device also includes thermal protection, to protect it against electrostatically discharged voltage (ESD).

The DG221 is available in a space-saving 8-pin SOIC surface mount package (DG221BDY-E3). The device is capable of operating over a wide temperature range of -40°C to +125°C.

Working Principle

The DG221 consists of two SPDT switches arranged in a single package. It works as a digital-to-analog switch, or a "multiplexer", which allows a single input to control multiple outputs. The switch is controlled by two digital inputs (A, B), and an enable (EN) input. When enabled, the two digital inputs determine which output line is connected to the output terminal. The schematic diagram below illustrates how the two SPDT switches are arranged inside the DG221.

The way the DG221 works is by connecting the two poles of the two SPDT switches together. When the A and B inputs are LOW, the switch in the lower left corner is activated, connecting output 1 to the output terminal. When the A input is LOW and the B input is HIGH, the switch in the upper right corner is actuated, connecting output 2 to the output terminal. When both inputs are HIGH, the switch in the upper right corner is actuated, connecting both outputs to the output terminal.

The enable (EN) input controls whether the switch is enabled or not. When the enable input is LOW, the switch is disabled and no signal is passed through. This is useful to avoid signal distortions from unwanted switching. The maximum break-before-make time of 8ns ensures that any undesired signals are not passed through in the short period of time between switching to the new output.

Application Fields

The DG221BDY-E3 is useful in a variety of application fields, particularly in communication and audio systems. It is used in audio power amplifiers, to switch between different audio signal sources, and to control the level of bass and treble. The switch can also be used in motor control systems, where it is used to switch between different motor control algorithms. The fast switching time and low off resistance of the DG221 makes it suitable for data communication applications, where it can be used to switch between different signal paths, or multiplex multiple signals into a single bus.

The DG221BDY-E3 is also useful in industrial automation applications, where it can be used to switch between different sensors or controllers. The low off resistance and high on/off current capability makes it suitable for applications where heavy loads need to be switched. The thermal protection feature of the DG221 helps to protect the device against electrostatic discharges (ESD).

Overall, the DG221BDY-E3 is a versatile analog switch IC that can be used in a variety of applications. Its low on-resistance, fast switching times, and high on/off current capability make it an ideal choice for communication, audio, and motor control applications.

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