ISL8499(2005) 查看數據表（PDF） - Intersil

零件编号

产品描述 (功能)

比赛名单

ISL8499
(Rev.:2005)

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

Intersil 

ISL8499

Test Circuits and Waveforms (Continued)

V+

C

SIGNAL

GENERATOR

NO or NC

IN 0V or V+

RON = V1/100mA

VNX

NO or NC

100mA

V1

V+

C

0V or V+

IN

ANALYZER

RL

COM

GND

COM

GND

FIGURE 4. OFF ISOLATION TEST CIRCUIT

FIGURE 5. RON TEST CIRCUIT

SIGNAL

GENERATOR

NO or NC

IN1

0V or V+

V+

C

COM

50Ω

ANALYZER

RL

COM

NC or NO

GND

N.C.

FIGURE 6. CROSSTALK TEST CIRCUIT

Detailed Description

The ISL8499 is a bidirectional, quad single pole/double

throw (SPDT) analog switch that offers precise switching

capability from a single 1.65V to 4.5V supply with low on-

resistance (0.24Ω) and high speed operation (tON = 15ns,

tOFF = 13ns). The device is especially well suited for

portable battery powered equipment due to its low operating

supply voltage (1.65V), low power consumption (2.7µW

max), low leakage currents (150nA max), and the tiny QFN

and TSSOP packages. The ultra low on-resistance and Ron

flatness provide very low insertion loss and distortion to

applications that require signal reproduction.

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 GND (see

7

IMPEDANCE

ANALYZER

NO or NC

V+

C

IN 0V or V+

COM

GND

FIGURE 7. CAPACITANCE TEST CIRCUIT

Figure 8). To prevent forward biasing these diodes, V+ must

be applied before any input signals, and the input signal

voltages must remain between V+ and GND. 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 1kΩ

resistor in series with the input (see Figure 8). 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.

This method is not acceptable for the signal path inputs.

Adding a series resistor to the switch input defeats the

purpose of using a low RON switch, so two small signal

diodes can be added in series with the supply pins to provide

overvoltage protection for all pins (see Figure 8). These

additional diodes limit the analog signal from 1V below V+ to

FN6111.0

January 27, 2005

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