BACKGROUND Analog switches have been available since 60's component sy

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BACKGROUND Analog switches have been available since 60's component sy

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AND8133/D Analog Switches Solve Many Problems within Cell Phone
BACKGROUND Analog switches have been available since 60's component systems designers. With advent ASICs ASSPs, many designers have experienced real value these devices. Today's designers familiar with venerable MC14066, workhorse that been around years more. device consists independent switches that provide bilateral capabilities when "On" nearly infinite impedance when "OFF". 4066 done metal gate CMOS. voltage rating when switched "ON" resistance [500 smallest package TSSOP with approximately board space occupied. today's designer aware strides made analog switches, many issues associated with metal gate part have been solved with today's sub-micron silicon gate CMOS tiny transistor-like packages. Enter single gate solution: Semiconductor offers voltage, single version 4066 gate package. MC74VHC1G66DFT2 single switch (SPST) occupying less than tiny SC70/SC88A package. device specified from 2.0-5.5 offers resistance when turned "ON" almost infinite impedance when turned off. Interestingly, device pass/stop either digital analog signal. Digital signals passed with <1.0 nsec delay, very nearly change signal. Analog signals passed with less than 0.1% distortion device -3.0 point >100 MHz. Because utility, Semiconductor elected several more devices portfolio including SPST, SPDT, dual SPST, DPDT, Mux, dual DPDT functions. These available tiny packages from following problems presented illustrate analog switches cell phone applications. Problem: design oscillator with frequencies. purpose this illustrate analog switch used switch different crystal have single input device. purpose might slow microprocessor down conserve power, still function. this application assumed that inputs crystal. NLAS4599 SPDT switch selects crystals electronically under control MCU/DSP. Only tiny SC70 type package needed. diagram doesn't show power ground part simplicity.
32.768 CTRL XSTAL1 XSTAL2 NLAS4599
Figure
Problem: power consumption system using PLL. operating more, often draw more than continuously. design such that frequency constant period time, say, several minutes time longer), possible sample hold output where charges capacitor, hold charge period time (e.g. back reclose loop. amount droop from nominal voltage will depend upon capacitor used time circuit held open loop.
Semiconductor Components Industries, LLC, 2003
September, 2003 Rev.
Publication Order Number: AND8133/D
AND8133/D
tester. will make assumption that designer cannot afford give pins. Analog switches then make perfect solution. They introduce nearly zero delay time, cause almost distortion signal, configuration switched external pin. NLAS4599 Single Pole Double Throw (SPDT) switch, that will allow normal configuration wired through. control grounded through resistor, when external plug presented, needs take (assumed) supply route control pin, then will have pins available use. result only board space used, with near zero delay degradation signal. When external connector plugged enable changes circuit over pins routed from their normal position within circuit, used external pins test.
Power Enable
NLAS4501
Figure
Problem: Improving lock time changing time constant, having fast "attack" long hold time constant. analog switch used change either resistor capacitor that makes time constant PLL. Changing time constant allows loop close lock very quickly then long time constant maximum noise rejection.
CTRL NLAS4501 NLAS4599
NLAS4599
CTRL
Figure
Connect wherever needs circuit
Design testability. Cell phones complete communication systems built into tiny housings. They comprised I/O, memory, firmware. With firmware becoming such large part design, crucial that designer able enable software debugging, create system that analyzed field problems. analog switch permits designer re-route some I/Os create path analysis. purposes illustration, will show I/Os that need re-routing tested external
Figure
Conclusion Semiconductor offers more than dozen analog switches tiny packages varying from SC70 TSOP-5 (Quad flat no-lead) device. complete list shown following. ideas shown here many more implemented more these devices.
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AND8133/D
Device NLAS4501 NLAS4599 NLAS3157 NLAS323 NLAS324 NLAS325 NLAS1053 NLAS4592 NLAS44599 Function 1-SPST 1-SPDT 1-SPDT 2-SPST, 2-SPST, 2-SPST, Pos, 1-2:1 2-Independent SPDT 2-Independent DPDT Package SC88A, TSOP-5 SC88, TSOP-6 SC88 Micro-10
SPST Single Pole Single Throw, SPDT Single Pole Double Throw, DPDT Double Pole Double Throw
SC88 lead package that footprint TSOP-5/5 lead package with footprint lead package with footprint Micro-10 lead package with footprint QFN-16 lead package with footprint
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AND8133/D
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AND8133/D

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