ISL54503IHZ-T datasheet(9/13 Pages) INTERSIL

Part #	ISL54503IHZ-T

Description	1.8V to 5.5V, 2.5OHM, Single SPDT Analog Switch

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Manufacturer	INTERSIL [Intersil Corporation]

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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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ISL54503IHZ-T Datasheet(PDF) 9 Page - Intersil Corporation

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