SA1140 hangzhou?silan?microelectronics?co.,ltd ???rev:1.0????2004.10.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?1?of?6 block?diagram fm?radio?ic?for?digital?tuning?system zip-16 description the?SA1140?is?an?if?system?ic?designed?for?fm?car?stereo receivers.?it features? versatile? muting? characteristics? which? can? be? varied? with external?parts. features *??muting?characteristics a)???muting?operation?is?performed?under?weak?signal?strength. b)? maximum? muting? attenuation? can? be? selected? to? be approximately?6?to?40?db. c)?input? signal? strength? level? which? actuates?the?muting circuit? can be?set?freely. *?high?limiting?sensitivity *?high?s/n?(78?db?typ.) *?good?amr *?signal?meter?drive?output?proportional?to?the?input?signal strength?in db?(suitable?to?control?multiplex?ic?sa3370). applications *?fm?car?stereo??receivers,?fm?home?radio ordering?information device package SA1140 zip-16
SA1140 hangzhou?silan?microelectronics?co.,ltd ???rev:1.0????2004.10.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?2?of?6 absolute?maximum?rating (t amb =25 c) characteristics symbol rating unit maximum?supply?voltage v cc ?max 16 v maximum?supply?current i cc ?max 40 ma 640 mw allowable?power?dissipation p d ?max 460 mw input?voltage v in 1 vp-p i2 0.2 ma i3 0.2 ma flow-in?current i6 2 ma i5 1 ma i13 2 ma i14 2 ma i15 1 ma flow-out?current i16 1 ma operating?temperature t opr -20?to?+70 c storage?temperature t stg -40?to?+125 c electrical?characteristics (t amb =25 c,?v cc =8v,?f=10.7mhz,?see?specified?test?circuit) characteristics symbol test?condition min. typ. max. unit recommended?supply?voltage v cc 8 v operating?supply?voltage?range v ccop 7.5 16 v quiescent?current i cco ?v in =0 15 21 27 ma current?drain i cc v in ?=?100?db 20 25 30 ma demodulation?output v o v in ?=?100?db,?400?hz?100% mod. 200 260 320 mvrms total?harmonic?distortion t hd v in ?=?100?db,?400?hz?100% mod. 0.05 0.2 % signal-to-noise?ratio s/n v in ?=?100?db,?400?hz?100% mod. 72 78 db input?limiting?voltage v in ?(lim) vo:?3?db?down,?400?hz?100% mod. 25 29 db muting?sensitivity v in ?(mute) v 14 ?=?2.0?v 22 26 32 db muting?attenuation?(1) m ute ?(acc) v 6 ?=?2.0?v?(22?k w ),?v in ?=?100 db,?400?hz?100%?mod. 10 15 20 db muting?attenuation?(2) m ute ?(acc) v 6 ?=?5.0?v?(22?k w ),?v in ?=?100 db,?400?hz?100%?mod. 24 28 32 db muting?bandwidth b w ?(mute) v in ?=?100?db,?v 14 ?=?2.0?v 140 210 370 khz (to?be?continued)
SA1140 hangzhou?silan?microelectronics?co.,ltd ???rev:1.0????2004.10.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?3?of?6 (continued) characteristics symbol test?condition min. typ. max. unit am?rejection?ratio a mr v in ?=?100?db,?f m ?400?hz. 100%?mod.,?am?1?khz?30% mod. 50 63 db muting?drive?output(1) v 14-0 ?v in =0 3.5 4.2 5.0 v muting?drive?output ? 2 ? v 14-100 ?v in ?=?100?db 0 0 0.3 v signal?meter?output?(1) v 15-0 ?v in =0 0 0.1 0.3 v signal?meter?output?(2) v 15-50 ?v in =?50?db 0.8 1.4 2.0 v signal?meter?output?(3) v 15-70 ?v in ?=?70?db 1.6 2.4 3.2 v signal?meter?output?(4) v 15-100 ?v in ?=?100?db 4.5 5.3 6.0 v agc?output?(1) v 16-0 ?v in =0 3.5 4.1 4.5 v agc?output?(2) v 16-100 ?v in ?=?100?db 0 0.02 0.3 v offset?voltage?(1) v 7-13 ?v in =0,?pin?7?to?13 ?0.25 0 +0.25 v offset?voltage?(2) v 8-13 ?v in =0,?pin?8?to?13 ?0.5 0 +0.5 v pin?configurations pin?descriptions pin?no. pin?name description 1 in+ positive?in 2 in- negative?in 3 preampout? out??of?if?preamp 4 gnd1 gnd1 5 attadj resister? ? connected? between? p5? and? gnd? determines? the? maximum muting?attenuation 6 mutein the? higher? the? current? flowing? into? p6,the? lower? the? gain? (the? higher? the attenuation?) 7 afc afc?clamp 8 out out?of?af (to?be?continued)
SA1140 hangzhou?silan?microelectronics?co.,ltd ???rev:1.0????2004.10.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?4?of?6 (continued) pin?no. pin?name description 9 ifout out?of?if 10 gnd2 gnd2 11 quadin in?of?quadrature?det 12 vcc vcc 13 vreg regulative?voltage 14 mutedrive connected?to?p6?through?resister 15 s-meter signal?meter 16 agc automatic?gain?control function?description 1 muting?characteristic the? muting? operation? is? performed? by? an? af? preamplifier,? the? gain? of? which? varies? continuously? with? control current,?and?a?muting?drive?output?circuit?which?supplies?the?control?current. the? gain? of? the? af? preamplifier? decreases? with? increasing? gain? control? current? applied? to? pin? 6.? however,? the gain?does?not?decrease?further?when?the?control?current?reaches?approximately?120?a?or?greater.?the?lower?limit of?the?gain?under?this?condition?depends?upon?a?resistor?connected?between?pin?5?and?gnd,?and?the?higher?the resistance?the?lower? the?gain?(the?higher? the?attenuation).? thus?the?maximum?muting?attenuation? will?be?set? by connecting?the?resistor?between?pin?5?and?gnd. 2 the?muting?drive?output?comes?in?three?types: 1)? hole?detector?output?which?develops?a?voltage?when?c/n?(carrier-to-noise?ratio)?lowers?under? weak?signal input?conditions. 2)?a?reversed?output?of?the?signal?strength?indicating?output?(output?at?pin?15) 3)? a? bandwidth? limited?muting? drive? output? which? develops?a? voltage? when? the? afc? output? becomes? higher than vbe?during?tuning-off?operation. all?these?outputs?are?led?to?an?or?circuit?and?the?processed?output?is?developed?at?pin?14. 3 the? general? method? to? adjust? the? muting? circuit? of? the? SA1140? is:? to? set? the? signal? input? level? required? to actuate?the?muting?circuit?with?the?r16-g,?to?adjust?the?slope?of?the?curve?for?the?muting?attenuation?vs.?antenna signal?input?with?the?r15-g,?and?to?adjust?the?maximum?muting?attenuation?(determined?by?setting?the?noise?level at?no?signal)?with?the?r5-g.?the?slope?of?the?curve?for?the?muting?attenuation?vs.?antenna?signal?input?level?can also? be? adjusted? by? the? resistor? connected? between? pins? 14? and? 6? in? addition? to? r15-g,? however,? selecting? a resistor? too? high?does? not? allow? the?muting? control? current? flowing? into? pin? 6?to? reach? 120?a? even? though? the maximum?muting?drive?output?(v14)?is?applied,?namely?the?muting?attenuation?does?not?reach?its?maximum?value. accordingly?a?recommended?value?of?the?resistor?between?pins?14?and?6?is?about?22?k w .
SA1140 hangzhou?silan?microelectronics?co.,ltd ???rev:1.0????2004.10.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?5?of?6 test?circuits typical?application?circuit
SA1140 hangzhou?silan?microelectronics?co.,ltd ???rev:1.0????2004.10.27 http:?www.silan.com.cn??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?6?of?6 package?outline zip-16 unit:?mm
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