MAX366CSA Maxim Integrated Products, MAX366CSA Datasheet - Page 9

• Manufacturer Part Number: MAX366CSA
• Description: IC SIGNAL-LINE CIRC PROT 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX366CSA

• Voltage - Clamping: ±40V
• Technology: Mixed Technology
• Power (watts): 471mW
• Number Of Circuits: 3
• Applications: General Purpose
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Working: -

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 V
voltage to form the V
age could cause the OUT pin to go into a fault condi-
tion prematurely.
Figure 5. Power-Supply Sequencing
1
2
3
4
IN1
IN2
IN3
V-
MAX366
_______________________________________________________________________________________
OUT
OUT1
OUT2
OUT3
voltage. Using a higher volt-
V+
8
7
6
5
100k
OP AMP
-5V
P
SWITCHED +5V
Signal-Line Circuit Protectors
+5V
IN
In 50Ω 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.
Figure 6. Path-Resistance Measuring Circuit
ADJUSTABLE ANALOG VOLTAGE
100mV
V-
V
4
IN
High-Frequency Performance
PATH RESISTANCE = 100mV/A
IN_
V-
MAX366
OUT_
V+
8
V
OUT
A
V+
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