DG409AK-E3 Datasheet, PDF (12/16 Pages) Vishay Siliconix – 8-Ch/Dual 4-Ch High-Performance CMOS Analog Multiplexers

DG408MIL, DG409MIL
Vishay Siliconix
APPLICATION HINTS
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 10). 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 VS - (V-) does not
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+
1N4148
S_X
V_g
D
DG408
1N4148
V-
Fig. 10 - Overvoltage Protection Using Blocking Diodes
8-Channel Sequential Multiplexer/Demultiplexer
Differential 4-Channel Sequential Multiplexer/Demultiplexer
+ 15 V
- 15 V
+ 15 V
- 15 V
Analog
Inputs
(Outputs)
+ 15 V
V+ GND V-
S₁
S₂
S₃
S_{4 DG408 D}
S₅
S₆
S₇
S₈
A₀ A₁ A₂ EN
Analog
Output
(Input)
Differential
Analog
Inputs
(Outputs)
+ 15 V
V+ GND V-
S_1a
S_2a
S_3a
D_a
S_4a
DG409
S_1b
S_2b
S_3b
S_4b
A₀
D_b
A₁ EN
Differential
Analog
Outputs
(Inputs)
Clock
In
NC
DM7493 Q_B
B_IN
Q_C
A_IN
Q_D
Q_A
NC
r₀₁ r_{02 GND}
Clock
In
J
Q
1/2 MM74C73
CLK
K
Q
NC
J
Q
1/2 MM74C73
CLK
K
Q
NC
+ 15 V
CLEAR GND
CLEAR
6
Enable In
Reset Enable
(MUX On-Off Control)
Fig. 11
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Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and
reliability data, see www.vishay.com/ppg?70062.
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12
Document Number: 67952
S11-1003-Rev. A, 23-May-11
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000