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ISL84780IV-T Datasheet(PDF) 6 Page - Intersil Corporation |
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ISL84780IV-T Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 11 page 6 FN6099.1 December 27, 2004 Detailed Description The ISL84780 is a bidirectional, quad single pole/double throw (SPDT) analog switch that offers precise switching capability from a single 1.6V to 3.6V supply with low on- resistance (0.36 Ω) and high speed operation (tON = 12ns, tOFF = 8ns). The device is especially well suited for portable battery-powered equipment due to its low operating supply voltage (1.6V), low power consumption (5.4 µW max), low leakage currents (30nA max), and the tiny TQFN 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 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 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 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 approach, but the switch signal range is reduced and the 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 IN GND V+ C 0V or V+ NO or NC COM IN GND VNX V1 RON = V1/1mA 1mA 0V or V+ ANALYZER V+ C NO or NC SIGNAL GENERATOR RL GND IN1 COM 50 Ω N.C. COM NC or NO V+ C GND NO or NC COM IN IMPEDANCE ANALYZER 0V or V+ ISL84780 |
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