Datasheet

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  
   
SCLS542B − SEPTEMBER 2003 − REVISED JANUARY 2004
8
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
APPLICATION INFORMATION
’HC4851
V
CC
Microcontroller
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
Common Out
5 V
A/D − Input
V
CC
(8× Identical
Circuitry)
Sensor
Figure 3. Solution by Applying the ’HC4851 Multiplexer
+
+
+
N − Substrate (on V
CC
potential)
Disabled Analog Multiplex Input
V
IN
> V
CC
+ 0.7 V
Gate = V
CC
(Disabled)
Common Analog Output
V
out
> V
CC
P+ P+
Figure 4. Diagram of Bipolar Coupling Mechanism
(Appears if V
IN
Exceeds V
CC
, Driving Injection Current Into the Substrate)