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ISL43410IRZ Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL43410IRZ Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 13 page 8 FN6044.4 May 12, 2008 Detailed Descriptions The ISL43410 operates from a single 2V to 12V supply with low ON-resistance (115 Ω) and high speed operation (tON = 60ns, tOFF = 30ns). The ISL43410 is especially well suited to portable battery powered equipment thanks to the low operating supply voltage (2.0V), low power consumption (3µW), low leakage currents (5nA max), and the tiny MSOP and QFN packaging. High frequency applications also benefit from the wide bandwidth, and the very high OFF-isolation (75dB) and crosstalk rejection (-85dB). 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 GND (see Figure 8). To prevent forward biasing these diodes, V+ must be applied before any input signals, and 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 Ω 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 applicable 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 approach, but the switch resistance may increase, especially at low supply voltages. FIGURE 4. OFF-ISOLATION TEST CIRCUIT FIGURE 5. rON TEST CIRCUIT FIGURE 6. CROSSTALK TEST CIRCUIT FIGURE 7. CAPACITANCE TEST CIRCUIT Test Circuits and Waveforms (Continued) ANALYZER RL SIGNAL GENERATOR V+ C 0V OR V+ NO OR NC COM ADD GND INH 0V OR V+ V+ C 0V OR V+ NO OR NC COM ADD GND VNX V1 rON = V1/1mA 1mA INH 0V OR V+ ANALYZER V+ C NO1 OR NC1 SIGNAL GENERATOR RL GND ADD COM1 50 Ω NC COM2 NO2 OR NC2 INH V+ C GND NO OR NC COM ADD IMPEDANCE ANALYZER 0V OR V+ INH ISL43410 |
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