DG187AP

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DG187AP is an active optocoupler IC that performs several analog functions, most notably as an analog switch, a multiplexer, and a demultiplexer. Its featured application field is to provide electrical isolation between two circuits, while at the same time allowing control signals such as low-level logic inputs to control the analog signal switching. Its working principle lies in the fact that the DG187AP utilizes an integrated photo-transistor device as the output controlling circuit, which can be used to transfer electrical signals and control current to specific paths by separating two circuits that are electrically isolated. Therefore, the device can be used in multiple circuit applications where a low level current can be used to control the analog signal switching.

The DG187AP was designed primarily as an analog switch and multiplexer, allowing for a single output signal to be chosen from a large number of inputs. The multiplexer function allows for analog multiplexing, or selection, of input signals to the output, depending on the voltage of a controlling pin. The analog switch works in similarly, as one of the pins is used to control the switching of the input signal to the output. In addition, the DG187AP can also serve as a demultiplexer, allowing for the selection of output signals from a single input. It functions using the same principal when controlling the routing of the input signal to diverse outputs.

When used as an analog switch and/or multiplexer, the DG187AP implements a lowside control (ground control) method of connecting/disconnecting the input signals. When the input of the control pin is low, the associated switch is opened and no signals are supported to the output; this results in the isolation of input and output signals. When the control pin input is in its high state, the associated switch is switched on and the signals are conducted to the output. This means that the DG187AP can effectively switch analog signals by controlling the flow of current in the input/output lines, allowing for the effective switching of analog signals.

When used as a demultiplexer, the DG187AP operates in a similar manner. The input signal is connected to the input of the chip and the control pin is used to enable/disable the associated switch between the output line and the input signal. This is done with the help of the integrated photo-transistor device inside the chip. The active optocoupler acts as an amplifier by providing an amplified signal over the total ground or common line connection and enables the output of the device to be connected directly to various input lines. The voltage on the control line determines whether the signal is routed to the output or not, allowing for the effective multiplexing of signal inputs.

In summary, the DG187AP can be used to provide electrical isolation between two circuits and is a key component in many analog switching, multiplexing and demultiplexing applications. It works by using an integrated photo-transistor device as the output controlling circuit to control the switching of input and output signals, thus effectively allowing for the analog signal switching or multiplexing of inputs. It is an efficient device that can be used to provide protection from noise interference, while at the same time providing the versatility of either analog switching or analog multiplexing.

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