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MAX366ESA Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX366ESA Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page Signal-Line Circuit Protectors _______________________________________________________________________________________ 9 Figure 6 shows a circuit that can give 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 whole range. The ammeter must have a voltage drop of less than one millivolt (at any current) for accu- rate 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.) Measurements are made by setting the analog voltage, measuring the current, and calculating the path resistance. The procedure is repeated at each analog voltage and supply voltage. It is important to use a voltage source of 100mV or less. As shown in Figure 4, this voltage is added to the VIN voltage to form the VOUT voltage. Using a higher volt- age could cause the OUT pin to go into a fault condi- tion prematurely. High-Frequency Performance In 50 Ω systems, signal response is reasonably flat up to several megahertz (see Typical Operating Characteristics). Above 5MHz, the response has sev- eral minor peaks, which are highly layout dependent. Because the path resistance is dependent on the sup- ply voltage and signal amplitude, the impedance is not controlled. Adjacent channel attenuation up to 5MHz is about 3dB above that of a bare IC socket, and is due entirely to capacitive coupling. Pulse response is reasonable, but because the imped- ance changes rapidly, fast rise times may induce ringing as the signal approaches the fault voltage. At very high amplitudes (such as noise spikes), the capacitive cou- pling across the signal pins will transfer considerable energy, despite the fact that the DC path is a virtual open circuit. MAX366 OUT_ VIN 4 IN_ VOUT V+ V- V+ V- PATH RESISTANCE = 100mV/A 100mV ADJUSTABLE ANALOG VOLTAGE 8 A Figure 6. Path-Resistance Measuring Circuit MAX366 OUT1 1 IN1 7 +5V -5V OUT2 2 IN2 6 OUT3 3 IN3 5 V+ 4 V- 8 P 100k SWITCHED +5V OP AMP Figure 5. Power-Supply Sequencing |
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