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DG409DVZ Datasheet(PDF) 8 Page - Intersil Corporation

Part # DG409DVZ
Description  Single 8-Channel/Differential 4-Channel, CMOS Analog Multiple
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

DG409DVZ Datasheet(HTML) 8 Page - Intersil Corporation

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FN3283.8
June 13, 2006
Typical Applications
Overvoltage Protection
A very convenient form of overvoltage protection consists of
adding two small signal diodes (1N4148, 1N914 type) in
series with the supply pins (see Figure 9). This arrangement
effectively blocks the flow of reverse currents. It also floats
the supply pin above or below the normal V+ or V- value. In
this case the overvoltage signal actually becomes the power
supply of the IC. From the point of view of the chip, nothing
has changed, as long as the difference V+ - (V-) doesn’t
exceed 44V. The addition of these diodes will reduce the
analog signal range to 1V below V+ and 1V above V-, but it
preserves the low channel resistance and low leakage
characteristics.
Typical application information is for Design Aid Only, not
guaranteed and not subject to production testing.
FIGURE 7. INSERTION LOSS
FIGURE 8. SOURCE/DRAIN CAPACITANCES
Test Circuits and Waveforms (Continued)
A2
GND
A1
EN
D
V
-
V+
VO
+15V
-15V
A0
SIGNAL
GENERATOR
VIN
5V
RL
ANALYZER
INSERTION LOSS
20 Log
VOUT
VIN
-----------------
=
S1
IMPEDANCE
ANALYZER
A2
GND
A1
EN
V
-
V+
+15V
-15V
A0
CHANNEL
SELECT
3V OR 0V
S8
S1
|
|
D
1N4148
1N4148
DG408
V
-
VG
SX
V+
D
FIGURE 9. OVERVOLTAGE PROTECTION USING BLOCKING
DIODES
DG408, DG409


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