ISL8499 데이터 시트보기 (PDF) - Renesas Electronics
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ISL8499
Renesas Electronics
ISL8499 Datasheet PDF : 14 Pages
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ISL8499
Test Circuits and Waveforms (Continued)
V+
C
SIGNAL
GENERATOR
NO or NC
IN 0V or V+
ANALYZER
RL
COM
GND
FIGURE 4. OFF ISOLATION TEST CIRCUIT
rON = V1/100mA
VNX
NO or NC
100mA
V1
V+
C
IN 0V or V+
COM
GND
FIGURE 5. rON TEST CIRCUIT
SIGNAL
GENERATOR
NO or NC
IN1
0V or V+
V+
C
COM
50
ANALYZER
RL
COM
NC or NO
GND
N.C.
IMPEDANCE
ANALYZER
NO or NC
V+
C
IN 0V or V+
COM
GND
FIGURE 6. CROSSTALK TEST CIRCUIT
FIGURE 7. CAPACITANCE 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
(0.24) 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 TQFN, 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
FN6111 Rev 3.00
February 5, 2008
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 1k 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 1V above GND.
The low leakage current performance is unaffected by this
Page 7 of 14
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