TS3A4741_15 Datasheet, PDF (15/26 Pages) Texas Instruments – TS3A474x 0.9-Ω Low-Voltage Single-Supply 2-Channel SPST Analog Switches

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9 Application and Implementation
TS3A4741, TS3A4742
SCDS228E – AUGUST 2006 – REVISED DECEMBER 2014
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
Analog signals that range over the entire supply voltage (V_CC to GND) of the TS3A4741 and TS3A4742 can be
passed with very little change in R_on (see Typical Characteristics). The switches are bidirectional, so the NO, NC,
and COM pins can be used as either inputs or outputs.
9.2 Typical Application
3.3V
3.3V
0.1 PF
System
Controller
Data
0.1 PF
VCC
SPST switch
IN1
NO1
IN2
COM1
COM2
NO2
GND
Device 1
Device 2
0.1 PF
3.3V
0.1 PF
Figure 19. Typical Application Schematic
9.2.1 Design Requirements
Ensure that all of the signals passing through the switch are within the specified ranges to ensure proper
performance.
9.2.2 Detailed Design Procedure
The TS3A474x can be properly operated without any external components. However, TI recommends that
unused pins should be connected to ground through a 50-Ω resistor to prevent signal reflections back into the
device. TI also recommends that the digital control pins (INx) be pulled up to V_CC or down to GND to avoid
undesired switch positions that could result from the floating pin.
Copyright © 2006–2014, Texas Instruments Incorporated
Product Folder Links: TS3A4741 TS3A4742
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