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DG418DY-T1 Datasheet(PDF) 9 Page - Vishay Siliconix |
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DG418DY-T1 Datasheet(HTML) 9 Page - Vishay Siliconix |
9 / 11 page Document Number: 70051 S-71241–Rev. F, 25-Jun-07 www.vishay.com 9 Vishay Siliconix DG417/418/419 TEST CIRCUITS APPLICATIONS Switched Signal Powers Analog Switch The analog switch in Figure 10 derives power from its input signal, provided the input signal amplitude exceeds 4 V and its frequency exceeds 1 kHz. This circuit is useful when signals have to be routed to either of two remote loads. Only three conductors are required: one for the signal to be switched, one for the control signal and a common return. A positive input pulse turns on the clamping diode D1 and charges C1. The charge stored on C1 is used to power the chip; operation is satisfactory because the switch requires less than 1 µA of stand-by supply current. Loading of the signal source is imperceptible. The DG419’s on-resistance is a low 100 Ω for a 5 V input signal. Figure 9. Source/Drain Capacitances VL IN S V+ D f = 1 MHz - 15 V GND V- C 0 V, 2.4 V Meter HP4192A Impedance Analyzer or Equivalent + 5 V C + 15 V C D2 D1 S1 f = 1 MHz + 15 V IN S2 NC GND V+ C C 0 V, 2.4 V Meter HP4192A Impedance Analyzer or Equivalent DG417/418 DG419 VL IN S D f = 1 MHz GND C 0 V, 2.4 V CC D2 D1 S1 f = 1 MHz IN S2 NC - 15 V GND V+ V- C C 0 V, 2.4 V Meter HP4192A Impedance Analyzer or Equivalent Figure 10. Switched Signal Powers Remote SPDT Analog Switch Input Control GND DG419 V- C1 0.01 µF D1 S1 S2 VOUT RL1 10 k Ω RL2 10 k Ω VL D IN V+ |
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