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ISL54503IHZ-T Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL54503IHZ-T Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 13 page 9 FN6551.2 October 26, 2009 An OFF switch behaves like a capacitor and passes higher frequencies with less attenuation, resulting in signal feed-through from a switch’s input to output. Off-isolation is the resistance of this signal feed-through. Figure 18 details the high off-isolation provided by the ISL54503. At 1MHz, off-isolation is about 70dB in 50Ω systems, decreasing approximately 20dB per decade as frequency increases. Higher load impedances decrease off-isolation due to the voltage divider action of the switch OFF impedance and the load impedance. Leakage Considerations ESD protection diodes are internally connected between each analog-signal pin and both V+ and GND. One of these diodes conducts if any analog signal exceeds V+ or GND. Virtually all the analog leakage current comes from the ESD diodes to V+ or GND. Although the ESD diodes on a given signal pin are identical and therefore fairly well balanced, they are reverse biased differently. Each is biased by either V+ or GND and the analog signal. This means their leakages will vary as the signal varies. The difference in the two diode leakages to the V+ and GND pins constitutes the analog-signal-path leakage current. All analog leakage current flows between each pin and one of the supply terminals, not to the other switch terminal. This is why both sides of a given switch can show leakage currents of the same or opposite polarity. There is no connection between the analog signal paths and V+ or GND. ISL54503 |
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