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ISL8484

Ultra Low ON-Resistance, +1.65V to +4.5V, Single Supply, Dual SPDT Analog Switch

Renesas Electronics 

ISL8484

the resistance to this feedthrough, while crosstalk indicates the

amount of feedthrough from one switch to another. Figure 23

details the high off isolation and crosstalk rejection provided by

this part. At 100kHz, off isolation is about 62dB in 50

systems, decreasing approximately 20dB per decade as

frequency increases. Higher load impedances decrease off

isolation and crosstalk rejection due to the voltage divider

action of the switch OFF impedance and the load impedance.

Leakage Considerations

Reverse 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.

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.

Virtually all the analog leakage current comes from the ESD

diodes to V+ or GND. Although the ESD diodes on a given

Typical Performance Curves TA = +25°C, Unless Otherwise Specified.

0.30

0.35

ICOM = 100mA

0.34

0.29

0.33

0.28

0.32

V+ = 2.7V

ICOM = 100mA

0.27

V+ = 3.9V

0.26

V+ = 4.3V

0.25

V+ = 4.5V

0

1

2

3

4

5

VCOM (V)

FIGURE 10. ON-RESISTANCE vs SUPPLY VOLTAGE vs

SWITCH VOLTAGE

0.70

0.65

ICOM = 100mA

0.60

V+ = 1.65V

0.55

0.50

V+ = 1.8V

0.45

V+ = 2V

0.40

0.35

0.30

0

0.5

1.0

1.5

2.0

VCOM (V)

FIGURE 12. ON-RESISTANCE vs SUPPLY VOLTAGE vs

SWITCH VOLTAGE

0.31

0.3

V+ = 3V

0.29

V+ = 3.3V

0.28

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

VCOM (V)

FIGURE 11. ON-RESISTANCE vs SUPPLY VOLTAGE vs

SWITCH VOLTAGE

0.35

V+ = 4.3V

ICOM = 100mA

+85°C

0.30

+25°C

0.25

-40°C

0.20

0

1.0

2.0

3.0

4.0

5.0

VCOM (V)

FIGURE 13. ON-RESISTANCE vs SWITCH VOLTAGE

FN6128 Rev 5.00

May 12, 2008

Page 9 of 13

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