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LMS4684 Datasheet(PDF) 9 Page - Texas Instruments |
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LMS4684 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page 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 Submit Documentation Feedback 9 Product Folder Links: LMS4684 |
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Similar Description - LMS4684_15 |
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