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MAX4505 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4505 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 8 page Fault-Protected, High-Voltage, Signal-Line Protector Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. tance is a function of the applied voltage, which is dramatically altered by the ohmmeter itself. Autoranging ohmmeters are particularly unreliable. Figure 5 shows a circuit that gives reliable results. This circuit uses a 100mV voltage source and a low-voltage- drop ammeter as the measuring circuit, and an adjustable supply to sweep the analog voltage across its entire range. The ammeter must have a voltage drop of less than 1mV (up to the maximum test current) for accurate results. A Keithley model 617 electrometer has a suitable ammeter circuit, appropriate ranges, and a built-in voltage source designed for this type of mea- surement. Find the path resistance by setting the ana- log voltage, measuring the current, and calculating the path resistance. Repeat the procedure at each analog and supply voltage. Note that it is important to use a voltage source of 100mV or less. As shown in Figure 5, this voltage and the VAIN voltage form the VAOUT voltage. Using higher voltages could cause AOUT to go into a fault condition prematurely. MAX4505 VAOUT VAIN AIN V- V+ V+ 100mV PATH RESISTANCE = 100mV/A ADJUSTABLE ANALOG VOLTAGE AOUT A Figure 5. Path-Resistance Measuring Circuit TRANSISTOR COUNT: 56 Pin Configurations (continued) N.C. N.C. V- 1 2 8 7 V+ N.C. N.C. AIN AOUT µMAX 3 4 6 5 MAX4505 TOP VIEW Chip Information |
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