DG508AMIL Datasheet, PDF (9/11 Pages) Vishay Siliconix – Single 8-Ch/Differential 4-Ch CMOS Analog Multiplexers

TEST CIRCUITS
DG508A_MIL/509A_MIL
Vishay Siliconix
+15 V
V_S
S₁
V+
R_g = 50 W
A₀
A₁
A₂
GND EN
D
V–
V_O
R_L
1 kW
–15 V
Insertion Loss = 20 log
V_OUT
V_IN
FIGURE 8. Insertion Loss
Channel
Select
+15 V
V+
A₂
A₁
A₀
GND EN
S₁
S₈
D
V–
–15 V
Meter
HP4192A
Impedance
Analyzer
or Equivalent
f = 1 MHz
FIGURE 9. Source Drain Capacitance
APPLICATIONS^a
V+
Positive Supply
Voltage
(V)
15
10
12
8^b
V–
Negative Supply
Voltage
(V)
–15
–12
–10
–8
V_IN
Logic Input Voltage
V_INH(min)/V_INL(max)
(V)
2.4/0.8
2.4/0.8
2.4/0.6
2.4/0.4
V_S or V_D
Analog Voltage
Range
(V)
–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 V_S 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.
V+ v V_g v V–
S_X
V_g
+15 V
1N4148
V+
DG508A_MIL
Internal
Junction
D
Internal
Junction
V–
1N4148
–15 V
FIGURE 10. Overvoltage Protection Using Blocking Diodes
Document Number: 70067
S-00405—Rev. C, 21-Feb-00
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