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ISL54053 Fiches technique(PDF) 7 Page - Intersil Corporation |
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ISL54053 Fiches technique(HTML) 7 Page - Intersil Corporation |
7 / 11 page 7 FN6460.2 September 25, 2007 Detailed Description The ISL54053 is a bidirectional, single pole/double throw (SPDT) analog switch which offers precise switching capability from a single 1.8V to 5.5V supply with low ON-resistance (0.8 Ω) and high speed operation (tON = 24ns, tOFF = 10ns). The device is especially well suited for portable battery powered equipment due to its low operating supply voltage (1.8V), low power consumption (5.5 μW), low leakage currents (300nA max) and the small μTDFN package. The low on-resistance and rON flatness provide very low insertion loss and distortion to application 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 precautions must be implemented to prohibit the current and voltage at the logic pin and signal pins from exceeding the maximum ratings of the switch. The following two methods can be used to provided additional protection to limit the current in the event that the voltage at a signal pin or logic pin goes below ground or above the V+ rail. Logic inputs can be protected by adding a 1k Ω resistor in series with the logic 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. Connecting schottky diodes to the signal pins (as shown in Figure 8) will shunt the fault current to the supply or to ground thereby protecting the switch. These schottky diodes must be sized to handle the expected fault current. Power-Supply Considerations The ISL54053 construction is typical of most single supply CMOS analog switches, in that they have two supply pins: V+ and GND. V+ and GND drive the internal CMOS switches and set their analog voltage limits. Unlike switches with a 4.5V maximum supply voltage, the ISL54053 5.5V maximum supply voltage provides plenty of room for the 10% tolerance of 4.3V supplies, as well as room for overshoot and noise spikes. The minimum recommended supply voltage is 1.8V but the part will operate with a supply below 1.8V. It is important to note that the input signal range, switching times, and on-resistance degrade at lower supply voltages. Refer to the “Electrical Specifications” tables starting on page 3 and “Typical Performance Curves” on page 8 for details. FIGURE 6. CROSSTALK TEST CIRCUIT FIGURE 7. CAPACITANCE TEST CIRCUIT Test Circuits and Waveforms (Continued) 0V OR V+ ANALYZER V+ C NO OR NC SIGNAL GENERATOR RL GND IN1 COM NC OR NO 50 Ω V+ C GND NO or NC COM IN IMPEDANCE ANALYZER VINL OR VINH FIGURE 8. OVERVOLTAGE PROTECTION GND VCOM VNX V+ INX OPTIONAL PROTECTION RESISTOR OPTIONAL SCHOTTKY DIODE OPTIONAL SCHOTTKY DIODE ISL54053 |
Numéro de pièce similaire - ISL54053 |
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Description similaire - ISL54053 |
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