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ADG752BRM Datasheet(PDF) 6 Page - Analog Devices |
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ADG752BRM Datasheet(HTML) 6 Page - Analog Devices |
6 / 8 page REV. 0 ADG752 –6– FREQUENCY – MHz 100 10 1 –8 –4 –2 0 –6 TA = +25 C Figure 7. On Response vs. Frequency GENERAL DESCRIPTION The ADG752 is an SPDT switch constructed using switches in a T configuration to obtain high “OFF” isolation while main- taining good frequency response in the “ON” condition. Figure 8 shows the T-switch configuration. While the switch is in the OFF state, the shunt switch is closed and the two series switches are open. The closed shunt switch provides a signal path to ground for any of the unwanted signals that find their way through the off capacitances of the series’ MOS devices. This results in more improved isolation between the input and output than with an ordinary series switch. When the switch is in the ON condition, the shunt switch is open and the signal path is through the two series switches which are now closed. D IN S SERIES SHUNT Figure 8. Basic T-Switch Configuration LAYOUT CONSIDERATIONS Where accurate high frequency operation is important, careful consideration should be given to the printed circuit board layout and to grounding. Wire wrap boards, prototype boards and sockets are not recommended because of their high parasitic inductance and capacitance. The part should be soldered di- rectly to a printed circuit board. A ground plane should cover all unused areas of the component side of the board to provide a low impedance path to ground. Removing the ground planes from the area around the part reduces stray capacitance. Good decoupling is important in achieving optimum perfor- mance. VDD should be decoupled with a 0.1 µF surface mount capacitor to ground mounted as close as possible to the device itself. VDD IN ADG752 D S1 S2 75 VOUT 75 CH1 CH2 A = 2 250 250 75 75 Figure 9. Multiplexing Between Two Video Signals |
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