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ISL43L840IRZ-T Scheda tecnica(PDF) 6 Page - Intersil Corporation |
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ISL43L840IRZ-T Scheda tecnica(HTML) 6 Page - Intersil Corporation |
6 / 11 page 6 FN6096.1 Detailed Description The ISL43L840 analog switches offer precise switching capability from a single 1.6V to 3.6V supply with low on- resistance (0.5 Ω) and high speed operation (tRANS = 19ns). The device is especially well-suited to portable battery powered equipment thanks to the low operating supply voltage (1.6V), low power consumption (0.2 µW), and low leakage currents (60nA max). High frequency applications also benefit from the wide bandwidth, and the very high off isolation and crosstalk rejection. 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 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 signal range is 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 0V or V+ NO or NC COM ADDX GND V+ C 0V or V+ NO or NC COM ADDX GND VNX V1 RON = V1/100mA 100mA V+ C 0V or V+ ANALYZER NOA or NCA SIGNAL GENERATOR RL GND ADDX 50 Ω N.C. COMB NOB or NCB V+ C COMA GND NO or NC COM ADDX IMPEDANCE ANALYZER 0V or V+ V+ C ISL43L840 |
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