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DG541DY-T1-E3 Datasheet(PDF) 8 Page - Vishay Siliconix |
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DG541DY-T1-E3 Datasheet(HTML) 8 Page - Vishay Siliconix |
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8 / 18 page  www.vishay.com 8 Document Number: 70055 S11-1429–Rev. H, 18-Jul-11 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 TEST CIRCUITS APPLICATIONS Device Description The DG540, DG541, DG542 family of wideband switches offers true bidirectional switching of high frequency analog or digital signals with minimum signal crosstalk, low insertion loss, and negligible non-linearity distortion and group delay. Built on the Siliconix D/CMOS process, these "T" switches provide excellent off-isolation with a bandwidth of around 500 MHz (350 MHz for DG541). Silicon-gate D/CMOS processing also yields fast switching speeds. An on-chip regulator circuit maintains TTL input compatibility over the whole operating supply voltage range, easing control logic interfacing. Circuit layout is facilitated by the interchangeability of source and drain terminals. Frequency Response A single switch on-channel exhibits both resistance (RDS(on)) and capacitance (CS(on)). This RC combination has an attenuation effect on the analog signal – which is frequency dependent (like an RC low-pass filter). The - 3-dB bandwidth of the DG540 is typically 500 MHz (into 50 ). This measured figure of 500 MHz illustrates that the switch channel can not be represented by a two stage RC combination. The on capacitance of the channel is distributed along the on- resistance, and hence becomes a more complex multi stage network of R’s and C’s making up the total RDS(on) and CS(on). See Application Note AN502 for more details. Off-Isolation and Crosstalk Off-isolation and crosstalk are affected by the load resistance and parasitic inter-electrode capacitances. Higher off-isolation is achieved with lower values of RL. However, low values of RL increase insertion loss requiring gain adjustments down the line. Stray capacitances, even a fraction of 1 pF, can cause a large crosstalk increase. Good layout and ground shielding techniques can considerably improve your ac circuit performance. Figure 6. All Hostile Crosstalk S2 S3 S4 X TA LK(AH) = 20 log 10 V OUT V IN VO 10 Ω RL 75 Ω INX S1 V+ V- + 15 V - 15 V C C GND 2.4 V D2 D3 D1 D4 RL RL RL |
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