ISL8484(2006) 查看數據表（PDF） - Intersil
零件编号
产品描述 (功能)
比赛名单
ISL8484
(Rev.:2006)
(Rev.:2006)
Intersil
ISL8484 Datasheet PDF : 13 Pages
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ISL8484
Test Circuits and Waveforms (Continued)
V+
C
SIGNAL
GENERATOR
NO OR NC
IN 0V OR V+
ANALYZER
RL
COM
GND
RON = V1/100mA
VNX
NO OR NC
100mA
V1
V+
C
0V OR V+
IN
COM
GND
Signal direction through switch is reversed, worst case values
are recorded. Repeat test for all switches.
FIGURE 4. OFF ISOLATION TEST CIRCUIT
Repeat test for all switches.
FIGURE 5. RON TEST CIRCUIT
SIGNAL
GENERATOR
V+
C
NO OR NC
COM
50Ω
IN1
0V or V+
ANALYZER
RL
COM
NC or NO
GND
N.C.
Signal direction through switch is reversed, worst case values
are recorded. Repeat test for all switches.
FIGURE 6. CROSSTALK TEST CIRCUIT
Detailed Description
The ISL8484 is a bidirectional, dual 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
(0.23Ω) and high speed operation (tON = 20ns, tOFF = 15ns).
The device is especially well suited for portable battery
powered equipment due to its low operating supply voltage
(1.65V), low power consumption (4.5µW max), low leakage
currents (110nA max), and the tiny DFN and MSOP
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
7
IMPEDANCE
ANALYZER
V+
C
NO OR NC
IN 0V OR V+
COM
GND
Repeat test for all switches.
FIGURE 7. CAPACITANCE TEST CIRCUIT
ESD protection diodes from the pin to V+ and to GND (see
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 1kW
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
FN6128.2
September 13, 2006
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