SN74HC4851
8 CHANNEL ANALOG MULTIPLEXER/DEMULTIPLEXER
WITH INJECTION CURRENT EFFECT CONTROL
SCLS542B − SEPTEMBER 2003 − REVISED JANUARY 2004
APPLICATION INFORMATION
VCC = 5 V
IIO
VIN2 < VSS or VCC < VIN2
Any Disabled Channel
VSS < VIN1 < VCC
Enabled Channel
Vout = VI1 V
±
V∆out
RS
Figure 1. Injection-Current Coupling Specification
6V
5V
VCC
Sensor
’HC4051
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
(8× Identical
Circuitry)
Channel 7
Channel 8
Common Out
A/D − Input
Microcontroller
VCC
5V
Figure 2. Alternate Solution Requires 32 Passive Components and One Extra 6-V Regulator
to Suppress Injection Current Into a Standard ’HC4051 Multiplexer
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
7
TI [ TEXAS INSTRUMENTS ]
