전자부품 데이터시트 검색엔진 |
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ISL43110IB-T 데이터시트(PDF) 7 Page - Intersil Corporation |
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ISL43110IB-T 데이터시트(HTML) 7 Page - Intersil Corporation |
7 / 12 page 7 FN6028.3 April 12, 2005 Detailed Description The ISL43110 and ISL43111 analog switches offer precise switching capability from a single 2.4V to 12V supply with low on-resistance and high speed operation. The devices are especially well suited to portable battery powered equipment thanks to the low operating supply voltage (2.4V), low power consumption (5 µW), low leakage currents (1nA max), and the tiny SOT-23 packaging. High frequency applications also benefit from the wide bandwidth, and the very high off isolation. Supply Sequencing And Overvoltage Protection As 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 6). 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 6). 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 6). 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. Power-Supply Considerations The ISL4311X construction is typical of most CMOS analog switches, except that there are only two supply pins: V+ and GND. Unlike switches with a 13V maximum supply voltage, the ISL4311X 15V maximum supply voltage provides plenty of room for the 10% tolerance of 12V supplies, as well as room for overshoot and noise spikes. The minimum recommended supply voltage is 2.4V. It is important to note that the input signal range, switching times, and on-resistance degrade at lower supply voltages. Refer to the electrical specification tables and Typical Performance Curves for details. V+ and GND power the internal CMOS switches and set their analog voltage limits. These supplies also power the internal logic and level shifters. The level shifters convert the input logic levels to switched V+ and GND signals to drive the analog switch gate terminals. FIGURE 5. CAPACITANCE TEST CIRCUIT Test Circuits and Waveforms (Continued) V+ GND NO or NC COM IN IMPEDANCE ANALYZER 0V or V+ FIGURE 6. OVERVOLTAGE PROTECTION GND VCOM VNO or NC OPTIONAL PROTECTION V+ IN DIODE OPTIONAL PROTECTION DIODE OPTIONAL PROTECTION RESISTOR ISL43110, ISL43111 |
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유사한 설명 - ISL43110IB-T |
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