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MAX4513CSE Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4513CSE Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 16 page Quad, Rail-to-Rail, Fault-Protected, SPST Analog Switches 8 _______________________________________________________________________________________ 0 0.5 1.5 1.0 2.5 2.0 3.0 010 15 5 20253035 LOGIC-LEVEL THRESHOLD vs. V+ V+ (V) Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) 0 -10 -20 -120 0.01 0.1 1 10 100 1000 FREQUENCY RESPONSE -90 -100 -110 MAX186-14A FREQUENCY (MHz) -70 -80 -50 -60 -30 -40 120 100 80 -120 -60 -80 -100 -20 -40 20 0 60 40 ON LOSS OFF LOSS ON PHASE NAME FUNCTION 1, 16, 9, 8 IN1–IN4 Logic Control Digital Inputs 2, 15, 10, 7 COM1– COM4 Analog Switch Common* Terminals PIN 3, 14, 11, 6 NO1–NO4 or NC1–NC4 Analog Switch Fault-Protected Normally Open* or Normally Closed* Terminals 4 V- Negative Analog Supply Voltage Input. Connect to GND for single-supply operation. 13 V+ Positive Analog and Digital Supply-Voltage Input. Internally connected to substrate. 12 N.C. No Connection—not internally connected 5 GND Ground. Connect to digital ground. (Analog signals have no ground reference.) Pin Description * As long as the voltage on NO_ or NC_ does not exceed V+ or V-, NO_ (or NC_) and COM_ pins are identical and interchange- able. Either may be considered as an input or output; signals pass equally well in either direction. Detailed Description Overview of Traditional Fault-Protected Switches The MAX4511/MAX4512/MAX4513 are fault-protected CMOS analog switches with unusual operation and construction. Traditional fault-protected switches are constructed by three series FETs. This produces good off characteristics, but fairly high on-resistance when the signals are within about 3V of each supply rail. As the voltage on one side of the switch approaches with- in about 3V of either supply rail (a fault condition), the switch impedance becomes higher, limiting the output signal range (on the protected side of the switch) to approximately 3V less than the appropriate polarity supply voltage. During a fault condition, the output current that flows from the protected side of the switch into its load comes from the fault source on the other side of the switch. If the switch is open or the load is extremely high impedance, the input current will be very low. If the switch is on and the load is low impedance, enough current will flow from the source to maintain the load voltage at 3V less than the supply. |
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