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ISL43112IH-T Datasheet(PDF) 6 Page - Intersil Corporation |
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ISL43112IH-T Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 11 page 6 Detailed Description The ISL43112 and ISL43113 analog switches offer precise switching capability from ±1.5V to ±6V supplies with low on- resistance (15 Ω) and high speed operation (t ON = 40ns, tOFF = 25ns). The devices are especially well suited to portable battery powered equipment thanks to the low operating supply voltage ( ±1.5V), low power consumption (250 µW), low leakage currents (2nA 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 V- (see Figure 6). 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 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 V-. 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 V-. The power supplies need not be symmetrical for useful operation. As long as the total supply voltage (V+ to V-, including supply tolerances, overshoot, and noise spikes) is less than the 15V maximum supply rating, and the digital input switching point remains reasonable (see “Logic-Level Thresholds” section), the ISL43112/13 function well. The 15V maximum supply rating provides the designer of 12V systems much greater flexibility than switches with a 13V maximum supply voltage. The minimum recommended supply voltage is ±1.5V. It is important to note that the input signal range, switching times, and on-resistance degrade at lower supply voltages, and the digital input VIL becomes negative at VS ≤ ±2V. Refer to the “Typical Performance” curves for details. V+ and V- 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 V- signals to drive the analog switch gate terminals. This family of switches is not recommended for single supply applications. For single supply, similar performance, pin FIGURE 5. CAPACITANCE TEST CIRCUIT Test Circuits and Waveforms (Continued) V+ NO or NC COM IN IMPEDANCE ANALYZER V- or V+ V- FIGURE 6. OVERVOLTAGE PROTECTION V- VCOM VNO or NC OPTIONAL PROTECTION V+ IN DIODE OPTIONAL PROTECTION DIODE OPTIONAL PROTECTION RESISTOR ISL43112, ISL43113 |
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