EXECUTIVE SUMMARY NLAS2066 dual SPST (Single Pole Single Throw) switch

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EXECUTIVE SUMMARY NLAS2066 dual SPST (Single Pole Single Throw) switch

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AND8130/D Analog Switch Allows Switching Voltages
EXECUTIVE SUMMARY NLAS2066 dual SPST (Single Pole Single Throw) switch with over-voltage tolerance (OVT) it's input pins. feature permits device used purpose sharing pins size constrained applications. Shared pins permit designer have smaller connector, saving cost both male female portions. INTRODUCTION modern world filled with many devices that permit user communicate, take photos short videos, listen music whole host features market. port modern computer most convenient, easiest use, high performance connection point consumer deal with. Although there other useful ports, port offers simple hookup, watts power, speeds from Kbits/sec Mbits/sec. port wires, bidirectional data, power. port supply much Many devices simply plug into port with need external power supply. Most users already familiar with peripherals such printers, pointing devices, keyboard, digital still camera. Most peripherals just "plug play". Modern P.C.s take care interface with minimal effort, only requiring installation software drivers. addition, number ports increased adding hub. simply works very well simplest, most convenient port consumer deal with. 1.1/2.0 adds High Speed specification original specification. There three speeds 2.0. three speed ranges are: Speed: 10-100 Kbits/sec Full Speed 500K-10 Mbits/sec High Speed 25-400 Mbits/sec devices backward forward compatible with both older revisions. user device that recently purchased that rated High Speed, still with older that only supports Full Speed mode. With ease use, inclusion nearly Windows, Linux systems built since 1998, ideal interface enhanced feature cell phone. phone with card updated minutes, even Full Speed mode. Photos, music, address books updated just seconds. When attempting device like cell phone designer several issues. Adding additional connector adds cost takes space. Adding more pins existing connector adds cost both female portion phone various male connectors that need supplied, form "dongles". simplify whole system multiplex some pins. MULTIPLEXING PINS This article will only concern itself with multiplexing data pins. power pins provide capability re-charge phone, without need wall mounted power supply. With close proximity wires possibility potential fault from power line data line, specification assumes data lines handle voltage 5.25 data line1 hours. data sent differentially NRZI maximum MBits/sec. cell phone manufacturer must supply interface cables. standard Type approximately connector probably large cell phone. Normally dongle2 provided with non-standard plug side standard type plug other. Depending upon features cell phone, socket provide audio, video, RS-232, other interfaces.
Universal Serial Specification, Revision April 2000. flexible cable with appropriate connectors both ends.
Semiconductor Components Industries, LLC, 2003
August, 2003 Rev.
Publication Order Number: AND8130/D
AND8130/D
fewer pins brought cell phone size connector made smaller. order minimize number pins reduce size cost, behooves manufacturer employ some form multiplexing sharing pins connector. Pins must capable bilateral transmission either analog digital signals. nominal. While this would work, places cost component burden system. need product like cell phone rare today. otherwise, needed would place demand regulator additional voltage from dc/dc converter board. Camera enabled cell phones have very limited space, option very desirable. order save space component cost minimize number power supplies. analog switch would need operate from supply voltage approximately able accept 5.25 fault. designer could find switch that could accept 5.25 while operating from then power supply could disappear. Ordinary analog switches have diodes connected both supply ground pin, protect device against Electrostatic Discharge (ESD). switch were operated either data line 5.25 fault, input diode connected would destroyed. This could cause damage, could tolerated. device, NLAS2066 dual analog switch been introduced from Semiconductor, which permits operation while inputs permit subject much regardless operating voltage. This switch resistance enough permit with Full Speed specification.
Standard Analog Switch
Figure Type
Type
Figure Example Dongle
semiconductor industry been serving need bilateral switching years with standard analog switches. Available analog switches pass either digital analog signals directions. More recently, analog switches have been fabricated sub-micron silicon gate CMOS exhibit resistance 5-20 range, pass signals more. With values this low, analog switch could used provide switching. Also, frequency response switch should affect overall performance transceiver. Several standard switches available meet frequency requirements. additional requirement meet safety specifications, states that analog switch must capable voltage "fault" 5.25 Volts hours. solve this requirement simply operate switch
CTRL
Figure
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AND8130/D
NLAS2066
Filter Transceiver
Shared Pins
CTRL
Figure
side switch protected against high voltage. therefore possible this switch disconnect input from pins. Since Analog Switch provides high impedance state, necessary anything open input filter pins. application drawing shows implementation. shared pins hooked high impedance device. This device should also capable withstanding 5.25
CONCLUSION NLAS2066 tiny device occupying only board space that permits designer reduce number pins that outside world connector. diagram shows connect NLAS2066 permit shared pins. reducing number pins, designer save both space cost.
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AND8130/D
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AND8130/D

EXECUTIVE SUMMARY NLAS2066 dual SPST (Single Pole Single Throw) switch

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