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ISL43240IAZ 数据表(PDF) 8 Page - Intersil Corporation |
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ISL43240IAZ 数据表(HTML) 8 Page - Intersil Corporation |
8 / 14 page 8 Detailed Description The ISL43240 quad analog switches offer precise switching capability from a bipolar ±2V to ±6V or a single 2V to 12V supply with low on-resistance (18 Ω) and high speed operation (tON =52ns, tOFF = 40ns). The devices are especially well suited for portable battery powered equipment thanks to the low operating supply voltage (2V), low power consumption (5 µW), low leakage currents (5nA 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 V- (see Figure 8). To prevent forward biasing these diodes, V+ and V- must be applied before any input signals, and input signal voltages must remain between V+ and V-. 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. 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 V-. Repeat test for all switches. FIGURE 4. OFF ISOLATION TEST CIRCUIT Repeat test for all switches. 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 2.4V NO or NC COM IN GND C V- V+ C 0.8V or 2.4V NO or NC COM IN GND VNX V1 RON = V1/1mA 1mA C V- 0V or 2.4V ANALYZER V+ C NO1 or NC1 SIGNAL GENERATOR RL GND IN1 COM1 IN2 50 Ω 0V or 2.4V NO COM2 NO2 or NC2 C V- CONNECTION V+ GND NO or NC COM IN IMPEDANCE ANALYZER 0V or 2.4V V- ISL43240 |
类似零件编号 - ISL43240IAZ |
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类似说明 - ISL43240IAZ |
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