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LMS4684 Datasheet(PDF) 9 Page - Texas Instruments

Part # LMS4684
Description  0.5Ohm Low-Voltage, Dual SPDT Analog Switch
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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LMS4684 Datasheet(HTML) 9 Page - Texas Instruments

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RON
COM
NO or
NC
CS
SUPPLY VOLTAGE
ANALOG
INPUT
SIGNAL
COM
D1
NO
GND
0.047 PF
LMS4684
www.ti.com
SNOSAL0C – DECEMBER 2004 – REVISED APRIL 2013
It is also good practice to provide adequate supply bypassing to all analog circuits. We recommend a that
minimum bypass capacitor value of 0.047µF be provided for the LMS4684. An inadequate bypass capacitor can
lead to excessive supply current.
Figure 17. Input Over Voltage Protection Circuitry
OFF-ISOLATION
Analog switches are composed of FETs (field Effect Transistors). The channel resistance is low when the pass
transistors are "on" and that resistance is high when the pass transistors are "off". However, when the pass
transistors are "off", the source to drain capacitance of the pass transistors will pass some energy. This
capacitance is inversely proportional to the switch "on" resistance, so a switch with a low "on" resistance may not
be suitable for some high frequency applications.
Figure 18 shows the equivalent circuit of an analog switch. Unless the load impedance after the switch is
relatively low, the switch capacitance will couple excessive energy across the "open" switch at higher
frequencies, degrading off isolation performance. Off Isolation of the LMS4684 is specified with a 50
Ω load.
Higher load impedances will degrade off isolation performance compared with what is specified.
Figure 18. Equivalent Circuit of an Analog Switch
Off isolation may be improved by decreasing the LMS4684 load impedance below 50
Ω. When doing this, be sure
that the LMS4684 maximum current rating is not exceeded. Also, decreasing the load impedance too much can
result in excessive signal distortion because the channel resistance variation with input signal voltage would then
be a greater percentage of the load impedance.
If it is desired to extend the usable bandwidth of the LMS4684 while maintaining reasonable off-isolation is
through the use of the circuit of Figure 19.
Copyright © 2004–2013, Texas Instruments Incorporated
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