參數(shù)資料
型號(hào): DG408
廠商: Intersil Corporation
英文描述: Single 8-Channel/Differential 4-Channel, CMOS Analog Multiplexers(單8通道、差分4通道COMS模擬多復(fù)用器)
中文描述: 改進(jìn)的8路/雙4路、CMOS模擬多路復(fù)用器
文件頁(yè)數(shù): 8/17頁(yè)
文件大?。?/td> 606K
代理商: DG408
8
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)
A
2
A
1
A
0
GND
EN
D
V
-
V+
V
O
+15V
-
15V
SIGNAL
GENERATOR
V
IN
5V
R
L
ANALYZER
INSERTION LOSS
20 Log
VIN
=
S
1
IMPEDANCE
ANALYZER
A
2
GND
A
1
EN
V
-
V+
+15V
-
15V
A
0
CHANNEL
SELECT
3V OR 0V
S
8
S
1
|
|
D
1N4148
1N4148
DG408
V
-
V
G
S
X
V+
D
FIGURE 9. OVERVOLTAGE PROTECTION USING BLOCKING
DIODES
DG408, DG409
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