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MAX4507CWN Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4507CWN Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page Fault-Protected, High-Voltage Signal-Line Protectors 8 _______________________________________________________________________________________ Two clamp circuits limit the output voltage to within the supply voltages. When the power supplies are off, any input voltage applied at IN turns off both N1 and P1, and OUT is clamped to 0V. Normal Operation When power is applied, each protector acts as a resis- tor in series with the signal path. Any voltage source on the “input” side of the switch will be conducted through the protector to the output (Figure 2). When the output load is resistive, it draws current through the protector. The internal resistance is typically less than 100 Ω. High-impedance loads are relatively unaffected by the presence of the MAX4506/MAX4507. The protector’s path resistance is a function of the supply voltage and the signal voltage (see Typical Operating Characteristics). Fault Protection, Power Off When power is off (i.e., V+ = V- = 0), the protector is a virtual open circuit. With up to ±40V applied to the input pin, the output pin will be 0V. Fault Protection, Power On A fault condition exists when the voltage on the IN_ exceeds either supply rail. This definition is valid when power is on or off, as well as during all states while power ramps up or down. Applications Information Supplying Power Through External ICs The MAX4506/MAX4507 have low supply currents (<250µA), which allows the supply pins to be driven by other active circuitry instead of connected directly to the power sources. In this configuration, the parts can be used as driven fault-protected switches with V+ or V- used as the control pins. For example, with the V- pin grounded, the output of a CMOS gate can drive the V+ pin to turn the device on and off. This can effectively connect and disconnect three (MAX4506) or eight (MAX4507) separate signal lines at once. Ensure that the driving source(s) does not drive the V+ pin more negative than the V- pin. Figure 3 shows a simple turn-on delay that takes advantage of the MAX4506’s low power consumption. The two RC networks cause gradual application of power to the MAX4506, which in turn applies the input signals smoothly after the amplifier has stabilized. The two diodes discharge the two capacitors rapidly when the power turns off. Note that the IC used to supply power to the MAX4506/MAX4507 must be able to sup- ply enough current to maintain the load voltage at the supply rail in a fault condition. MAX4506 ROUT VIN IN1 V- V- V+ V+ 1 4 7 8 OUT1 Figure 2. Application Circuit MAX4506 IN3 V- -15V V+ +15V 3 4 5 10 µF 10 µF OUT3 IN2 26 OUT2 IN1 17 OUT1 8 100k 100k OP AMP Figure 3. Turn-On Delay |
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