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MAX4545EWP Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4545EWP Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches ______________________________________________________________________________________ 11 On the MAX4545, GND5 and GND6 should always be connected to the ground plane with solid copper to improve isolation and crosstalk. Signal Routing Keep all signal leads as short as possible. Separate all signal leads from each other and other traces with the ground plane on both sides of the board. Where possi- ble, use coaxial cable instead of printed circuit board traces. Board Layout IC sockets degrade high-frequency performance and should not be used if signal bandwidth exceeds 5MHz. Surface-mount parts, having shorter internal lead frames, provide the best high-frequency performance. Keep all bypass capacitors close to the device, and separate all signal leads with ground planes. Such grounds tend to be wedge-shaped as they get closer to the device. Use vias to connect the ground planes on each side of the board, and place the vias in the apex of the wedge-shaped grounds that separate signal leads. Logic-level signal lead placement is not critical. Impedance Matching The typical on-resistances of the switches in the MAX4545/MAX4546/MAX4547 are 14 Ω, but the off- state impedances are approximately equal to a 6pF capacitor. In coaxial systems, therefore, it is impossible to match any impedance for both the on and off state. If impedance matching is critical, the MAX4546 is best suited, since its two sections can be configured as a single on/off switch, as shown in Figure 2. This circuit “wastes” switches and has higher losses, but has bet- ter off isolation and maintains good impedance match- ing in both the on and off states. The resistance values shown in Figure 3 are optimized with ±5V supplies for both 50 Ω and 75Ω systems at room temperature. Multiplexer With its excellent off isolation, the MAX4545 is ideal for use in high-frequency video multiplexers. Figure 3 shows such an application for switching any one of four video inputs to a single output. The same circuit may be used as a demultiplexer by simply reversing the sig- nal direction. Stray capacitance of traces and the output capacitance of switches placed in parallel reduces bandwidth, so the outputs of no more than four individual switches should be placed in parallel if high bandwidth is to be main- tained. If more than four mux channels are needed, the 4-channel circuit should be duplicated and cascaded. COM1 GND1 GND1 NC4 NO1 GND4 COM4 NC3 NO2 COM2 GND2 IN2 GND3 COM3 IN1 1 3 4 6 7 8 14 15 16 12 13 11 10 9 5 V- V- 10nF 38 Ω (61 Ω) 38 Ω (61 Ω) 50 Ω OUT/IN 82 Ω (194 Ω) 50 Ω IN/OUT LOGIC IN 2 V+ V+ 10nF SWITCHES SHOWN FOR LOGIC “0” INPUT ( ) ARE FOR 75 SYSTEMS. SWITCH LOGIC 0 1 OFF ON MAX4546 Figure 2. Impedance Matching On/Off Switch |
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