Semiconductor introduced resistance analog switch suitable interfacing

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Semiconductor introduced resistance analog switch suitable interfacing

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AND8158/D NLAS4717 Analog Switch Permits Switching
Semiconductor introduced resistance analog switch suitable interfacing with (USB Full Speed). switch completely bi-lateral used carry either digital analog signals. NLAS4717 dual Single Pole Double Throw (SPDT) switch capable switching either independent signals differential signal pair with USB. specification, completed 2000, become mainstay peripheral connections. This specification fully encompasses older specification adds high speed rate. contains three speeds, Low, Full, High. Full Speed data rate specified 12.0 MBits/sec. Speed MBits/sec High Speed MBits/sec. balance this article will address Full Speed specification only. Full Speed rating more than adequate most handheld appliances. reader understand device like port needs signal switching all; normally expanded active port expanders (hub). value lies ability reduce number pins that outside world. example, digital camera almost assuredly needs interface ability deliver receive other signals well; video, audio, RS-232, charging, etc. ability reduce number pins going outside world, reduces connector size, saves cost improves reliability. almost cases, equipment manufacturer supplies required
cables. example, connector Series with subminiature Series connector other end. Another cable would used other purposes, example, charging, video, RS-232, audio etc. designer power available from cable supply switch. Using available supply saves precious battery charge whenever cable connected. data lines must capable being shorted power (5.0 hours, without harm equipment. This would present problem most analog switch designs, however Schottky diode prevents switch from shorting lower voltage battery. When used other than USB, assumed that device powered from battery from external power source, this case there mismatched voltage concerns. Full Speed differential signal that varies between driving balanced cable. series resistance approximately each section extremely well matched, introduce common mode component. small series resistance poses problems signal, f3dB well above MBits/sec requirements. threshold control signal NLAS4717 adjusted lower than normal, that when operating case USB) interface with almost controller.
Figure Series Connector
Figure Series Connector
Semiconductor Components Industries, LLC, 2004
May, 2004 Rev.
Publication Order Number: AND8158/D
AND8158/D
Other Considerations: signal pins should protected from with some form energy absorbing device. NUP2301 quad diode array provides protection, while only loading lines with additional capacitance. four diodes come single TSSOP-6 package offer excellent protection. Figure shows NLAS4717 used without being connected. Only wires connected, Ground, with other signaling, different cable assembly would used, ground would retained, other wires user used analog information such video/audio other digital signals. mode, power data lines accidentally shorted, from blocked from doing harm Schottky diode. analog switch will [4.3 nominally. designer must make sure anything connected switch able withstand this voltage.
BAT54 Xceiver
(B4) Type NUP2201 (A3) NLAS4717 Micro-10 (Bumped) CTRL (C2) (A2) (B1) (C3)
(C4)
(C1) (A1)
Other Switched Pair e.g. Video/Audio
Figure NLAS4717 Switch
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AND8158/D
Figure shows NLAS4717 with supply voltage from port supply voltage switch. Again Schottky diode necessary isolate from internal battery regulator. same cautions apply, circuit connected switch, needs able withstand +5.0 regardless battery voltage. should noted that NLAS4717 switched from state next with only +2.0 there should need translators from level MCU, even with being applied.
(B4) Cable Assembly (C2) (A2) (B1) NUP2201 (A3) NLAS4717 Micro-10 (Bumped) (C1) (A1) CTRL Switched Pair Other Switched Pair e.g. Video/Audio (C3) (C4) Xceiver
Figure NLAS4717 Switch with Supply Voltage
Summary NLAS4717 makes easy switch between other signals that stay within bounds supply voltage ground that designer needs switch. Switching enables less complex cables with fewer pins (cost saving) smaller size. designer flexibility manufacture purchase cable with only pins, i.e. including pin, then precautions taken
handle eliminated, e.g. Schottky diode. NLAS4717 handle 12.0 MBit/sec bandwidth Full Bandwidth with issues. NLAS4717 interface with standard analog digital signal, re-using pins with different cable assembly non-USB applications thereby reducing count, size cost, while increasing reliability.
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AND8158/D
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AND8158/D

Semiconductor introduced resistance analog switch suitable interfacing

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