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5962-91555201MEA Datasheet(PDF) 9 Page - Vishay Siliconix |
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5962-91555201MEA Datasheet(HTML) 9 Page - Vishay Siliconix |
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9 / 18 page  Document Number: 70055 S11-1429–Rev. H, 18-Jul-11 www.vishay.com 9 Vishay Siliconix DG540, DG541, DG542 This document is subject to change without notice. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 APPLICATIONS Power Supplies A useful feature of the DG54X family is its power supply flexibility. It can be operated from a single positive supply (V+) if required (V- connected to ground). Note that the analog signal must not exceed V- by more than - 0.3 V to prevent forward biasing the substrate p-n junction. The use of a V- supply has a number of advantages: 1. It allows flexibility in analog signal handling, i.e., with V- = - 5 V and V+ = 12 V; up to ± 5 V ac signals can be controlled. 2. The value of on capacitance [CS(on)] may be reduced. A property known as ‘the body-effect’ on the DMOS switch devices causes various parametric effects to occur. One of these effects is the reduction in CS(on) for an increasing V body-source. Note, however, that to increase V- normally requires V+ to be reduced (since V+ to V- = 21 V max.). Reduction in V+ causes an increase in RDS(on), hence a compromise has to be achieved. It is also useful to note that optimum video linearity performance (e.g., differential phase and gain) occurs when V- is around - 3 V. 3. V- eliminates the need to bias the analog signal using potential dividers and large coupling capacitors. Decoupling It is an established RF design practice to incorporate sufficient bypass capacitors in the circuit to decouple the power supplies to all active devices in the circuit. The dynamic performance of the DG54X is adversely affected by poor decoupling of power supply pins. Also, of even more significance, since the substrate of the device is connected to the negative supply, adequate decoupling of this pin is essential. Rules: 1. Decoupling capacitors should be incorporated on all power supply pins (V+, V-). (See Figure 7.) 2. They should be mounted as close as possible to the device pins. 3. Capacitors should have good high frequency characteristics - tantalum bead and/or monolithic ceramic types are adequate. Suitable decoupling capacitors are 1- to 10 µF tantalum bead, plus 10- to 100 nF ceramic. Board Layout PCB layout rules for good high frequency performance must be observed to achieve the performance boasted by the DG540. Some tips for minimizing stray effects are: 1. Use extensive ground planes on double sided PCB, separating adjacent signal paths. Multilayer PCB is even better. 2. Keep signal paths as short as practically possible, with all channel paths of near equal length. 3. Careful arrangement of ground connections is also very important. Star connected system grounds eliminate signal current flowing through ground path parasitic resistance from coupling between channels. Figure 7. Supply Decoupling + + - 3 V GNDs + 15 V DG540 V+ V- S1 S2 S3 S4 D1 D2 D3 D4 C1 C2 C1 C2 C1 = 10 μF Tantalum C2 = 0.1 μF Ceramic |
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