參數(shù)資料
型號: 7705201FC
廠商: VISHAY SILICONIX
元件分類: 多路復(fù)用及模擬開關(guān)
英文描述: 8-CHANNEL, SGL ENDED MULTIPLEXER, CDFP16
封裝: FP-16
文件頁數(shù): 11/11頁
文件大?。?/td> 172K
代理商: 7705201FC
DG508A_MIL/509A_MIL
Vishay Siliconix
Document Number: 70067
S-00405—Rev. C, 21-Feb-00
www.vishay.com
S FaxBack 408-970-5600
5-9
TEST CIRCUITS
FIGURE 8. Insertion Loss
FIGURE 9. Source Drain Capacitance
RL
1 k
W
A2
VO
D
Rg = 50 W
Insertion Loss = 20 log
VOUT
A1
VIN
A0
VS
S1
V+
GND
V–
–15 V
+15 V
EN
f = 1 MHz
S1
D
EN
+15 V
–15 V
GND
V+
V–
Meter
HP4192A
Impedance
Analyzer
or Equivalent
S8
A1
A2
A0
Channel
Select
APPLICATIONSa
V+
Positive Supply
Voltage
(V)
V–
Negative Supply
Voltage
(V)
VIN
Logic Input Voltage
VINH(min)/VINL(max)
(V)
VS or VD
Analog Voltage
Range
(V)
15
10
12
8b
–15
–12
–10
–8
2.4/0.8
2.4/0.6
2.4/0.4
–15 to 15
–12 to 12
–10 to 10
–8 to 8
Notes:
a.
Application Hints are for DESIGN AID ONLY, not guaranteed and not subject to production testing.
b.
Operation below
"8 V is not recommended.
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 11). 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 between VS and the V– rail
doesn’t exceed +44 V. The addition of these diodes will reduce
the analog signal range to 1 V below V+ and 1 V above V–, but
it preserves the low channel resistance and low leakage
characteristics.
1N4148
DG508A_MIL
D
–15 V
1N4148
V+ v Vg v V–
SX
Vg
V+
V–
+15 V
FIGURE 10. Overvoltage Protection Using Blocking Diodes
Internal
Junction
Internal
Junction
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