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AS1753V Datasheet(PDF) 9 Page - ams AG |
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AS1753V Datasheet(HTML) 9 Page - ams AG |
9 / 16 page www.austriamicrosystems.com Revision 1.41 9 - 16 AS1751/AS1752/AS1753 Data Sheet - Ap p lica tio n In fo r m a tio n 9 Application Information Power Supply Sequencing Proper power-supply sequencing is critical for proper switch operation. The power supplies should be started up in the following sequence: 1. V+ 2. NOx, NCx, COMx Note: Do not exceed the absolute maximum ratings (see page 2). Overvoltage Protection ON-resistance increases slightly at lower supply voltages. Figure 12. Overvoltage Protection using 2 External Blocking Diodes Adding diode D2 to the circuit shown in Figure 12 causes the logic threshold to be shifted relative to GND. Diodes D1 and D2 also protect against overvoltage conditions. For example, in the circuit shown in Figure 12, if the supply voltage goes below the absolute maximum rating, and if a fault voltage up to the absolute maximum rating is applied to an analog signal pin, no damage will result. Power Supply Bypass Power supply connections to the devices must maintain a low impedance to ground. This can be done using a bypass capacitor, which will also improve noise margin and prevent switching noise propagation from the V+ supply to other components. A 0.1µF bypass capacitor, connected from V+ to GND (see Figure 18 on page 11), is adequate for most applications. Logic Inputs Driving INx Rail-to-Rail will help minimize power consumption. Layout Considerations High-speed switches require proper layout and design procedures for optimum performance. ! Short, wide traces should be used to reduce stray inductance and capacitance. ! Bypass capacitors should be as close to the device as possible. ! Large ground planes should be used wherever possible. AS1751/AS1752/AS1753 GND VGEN COMx D2 D1 V+ V+ NOx |
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