10

Detailed Description

The ISL43841 analog switch offers a precise switching

supply with low on-resistance (39

Ω) and high speed

It has an latch bar pin to lock in the last switch address.

The device is especially well suited for applications using

Leakage, Charge Injection, ect.) is best in class.

High frequency applications also benefit from the wide

bandwidth, and the very high off isolation and crosstalk

rejection.

Supply Sequencing And Overvoltage Protection

With any CMOS device, proper power supply sequencing is

required to protect the device from excessive input currents

which might permanently damage the IC. All I/O pins contain

ESD protection diodes from the pin to V+ and to V+(see

Figure 9). To prevent forward biasing these diodes, V+ and

V- must be applied before any input signals, and input signal

voltages must remain between V+ and V-. If these conditions

cannot be guaranteed, then one of the following two

protection methods should be employed.

Logic inputs can easily be protected by adding a 1k

Ω

resistor in series with the input (see Figure 9). The resistor

limits the input current below the threshold that produces

permanent damage, and the sub-microamp input current

produces an insignificant voltage drop during normal

operation.

FIGURE 5. OFF ISOLATION TEST CIRCUIT

FIGURE 7. CROSSTALK TEST CIRCUIT

FIGURE 8. CAPACITANCE TEST CIRCUIT

ANALYZER

SIGNAL

GENERATOR

0V or V+

NOX

COMX

ADDX

GND

V-

C

V+

C

LATCH

0V or V+

NOX

COMX

ADDX

GND

1mA

V-

C

V+

C

LATCH

0V or V+

ANALYZER

SIGNAL

GENERATOR

GND

ADDX

50

Ω

N.C.

V-

C

V+

C

LATCH

GND

NOX

COMX

ADDX

IMPEDANCE

ANALYZER

0V or V+

V-

C

V+

C

LATCH

ISL43841