DG408DY-T Intersil, DG408DY-T Datasheet - Page 8

• Manufacturer Part Number: DG408DY-T
• Description: IC MULTIPLEXER 8X1 16SOIC
• Manufacturer: Intersil

Specifications of DG408DY-T

• Function: Multiplexer
• Circuit: 1 x 8:1
• On-state Resistance: 100 Ohm
• Voltage Supply Source: Single, Dual Supply
• Voltage - Supply, Single/dual (±): 5 V ~ 34 V, ±5 V ~ 20 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Test Circuits and Waveforms
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.
GENERATOR
ANALYZER
SIGNAL
INSERTION LOSS
FIGURE 7. INSERTION LOSS
V
IN
A
A
A
S
1
2
1
0
GND
8
EN
=
5V
20 Log
+15V
-
15V
V+
V
-
V
-----------------
D
V
OUT
IN
(Continued)
R
L
V
DG408, DG409
O
CHANNEL
FIGURE 9. OVERVOLTAGE PROTECTION USING BLOCKING
SELECT
FIGURE 8. SOURCE/DRAIN CAPACITANCES
V
G
DIODES
3V OR 0V
A
A
A
2
1
0
EN
S
GND
X
+15V
-
15V
V+
V
-
S
S
V+
V
D
|
|
1
8
-
DG408
1N4148
1N4148
D
IMPEDANCE
ANALYZER
June 13, 2006
FN3283.8