INTRODUCTION CMOS Analog switches have been available from semiconduct

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INTRODUCTION CMOS Analog switches have been available from semiconduct

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AND8131/D Resistance Analog Switches Permit Speaker Switching Cell Phones
INTRODUCTION CMOS Analog switches have been available from semiconductor industry more than years. venerable MC14066 example still popular device "4000" family. MC14066 exhibits series resistance (RON).Switches this style still popular useful controlling high impedance audio similar signals. past years industry begun offer switches 10-20 range, 2003 switches with values became available. NLAS4684 NLAS4685 examples switches with capable switching audio output signal that directly connected speaker. cell phone marketplace, virtually mandatory include jack external microphone/speaker connections. Many places world permit operation cell phone when driving, except hands-free mode. very common people walking talking into lapel mounted microphone, with earpiece placed users ear. potentially dangerous have ring tones that generated high levels directed into earpiece. mechanical switch disable speaker direct signal earpiece therefore ruled out. This design gets further strained, when adds features consumers demanding. stereo audio playback FM-stereo radio such desirable features. commuter riding metro suburban train would want have have music playback, choice, radio news. With rechargeable battery, high power microprocessor board, that needed MP3/FM functionality external memory card software, possibly tuner chip. MP3/FM
user will likely demand stereo playback. Both commercial radio require stereo audio amplifier. designer switch routing between stereo earpiece internal speaker, there choices: stereo audio output amplifiers stereo amplifier electronic switch
first blush, might appear that amplifiers might desirable with advent some switching technology will show this case. designer were stereo amplifiers, needs steer signals level appropriate amplifier. also needs Enable/Disable appropriate amplifier, reduce standby current. Semiconductor supplies small stereo amplifier capable output, that used this purpose. NCP2809 delivered Micro-10 surface mount package that occupying board space. second amplifier would occupy additional space. signals need routed appropriate amplifier, pair NLAS4599 devices packages could used. addition, inverter needed permit Enable/Disable function done with line from micro-controller. Semiconductor offers impedance switches that exhibit less than RON. NLAS4684 dual analog switch with typical available flip-chip bumped device. this form occupies only board space. Circuitry: following diagram shows cell phone based stereo amplifiers switch switch versus stereo amplifier NLAS4684.
Semiconductor Components Industries, LLC, 2003
August, 2003 Rev.
Publication Order Number: AND8131/D
AND8131/D
NLAS4599 NCP2809
ON/OFF Stereo Signal NLAS4599
NCP2809
ON/OFF
JACK
NL17SZ04
Figure Stereo Amplifiers Switch Earphone/Speaker
Alternative: analog switch that exhibits series resistance used. This will insert less than loss system when using 8-16 speakers. circuitry Figure amazingly simple. almost have mechanical switch that electrically controlled. embodiment reduces number parts amplifier such NCP2809, NLAS4684 analog switch. Cost almost more importantly board space considerable reduced. circuit accomplishes same function with fewer parts board space, cost complexity.
table following shows that approach saves standard switches, stereo amplifier inverter, while only adding NLAS4684 switch. switch fabricated silicon gate CMOS, only only control line. hooks "transparently" audio output, inserting almost loss. This approach saves board space, while saving approximately cost, compared dual amplifier approach.
Stereo Signal JACK NLAS4684 NCP2809
CTRL
Figure Speaker-Earphone Switching
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AND8131/D
Comparison Figure Figure Total Area Quantity Figure Figure NLAS4599 NCP2809 NL17SZ04 SPDT-Sw Stereo Inverter 41.5 23.5 Device Type Function
sq-mm
Total
NLAS4684 NCP2809
D-SPDT Stereo
Total Savings
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AND8131/D
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AND8131/D

INTRODUCTION CMOS Analog switches have been available from semiconduct

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