SC1088

SilanSemiconductors FM RECEIVER CIRCUIT FOR BATTERYSUPPLYDESCRIPTIONThe SC1088 is a bipolar integrated circuit for use in monoportable and pocket radios. It is used when a minimum of perpheralcomponents (of small dimensions and low costs) is important. Thecircuit contains a frequency-locked-loop(FLL) system with anintermediate frequency(IF) of about 70kHz. Selectivity is achievedby active RC-filters. De-tuning related to the IF and too weak inputsignal is suppressed by the mute circuit.SC1088FEATURES* Equipped with all stages of a mono receiver from antenna toaudio output.* Mute Circuit* Search tuning with a single varicap diode* Mechanical tuning with integrating AFC* AM application supported* Power supply polarity protection* Power supply voltage down to 1.8VSOP-16APPLICATION1. Mechanical tuning: This is possible with or without integrated AFC circuit2. Electrical tuning: This is realized by one directional(band-up) search tuning facility, including RESET to thelower-band limit.PIN CONFIGURATIONSMUTE116 TUNEVOAF215CAPLOOP314GNDVPOSC45SC10881312CLIMVIRFIF FB611VIRFCLP1710CLP2VOIF89VIIFHANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD1

SilanSemiconductors BLOCK DIAGRAMSC1088180pF3.9nF3.3nF330pF 0.1µF6 7 8 9 10 1382pF11125V1MixerVCO2.2kΩ 2.2kΩ+1V2VP6kΩIF Limter414V216Searchingtuning&RS1V3AFMUTE15 35.4kΩAll passFilterDemodulator6kΩLoopFilter-1V2210kΩ5kΩV10168pF220pF70nH78nHSC1088+3V680pF10nF5.6kΩ68nFRESET0.1µFNote: V1,V2 and V3 are internal voltages.Fig.1 Block Dirgram and Application Circuit for Search Tuning.470pFRUN 22nFAFVoAF22kΩ1.8nFHANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD2

SilanSemiconductors SC1088ABSOLUTE MAXIMUM RATINGSCharacteristic Symbol Value UnitSupply Voltage Vp 5 VOperating Temperature Tamb -10 ~ +70 °CStorage Temperature Tstg -55 ~ +150 °CDC ELECTRICAL CHARACTERISTICS(Tamb=25°C,Vp=3V ,Unless otherwise specified)Parameter Symbol Test conditions Min Typ Max UnitSupply Voltage(pin 4) Vp 1.8 3.0 5.0 VSupply Current(Pin 4) Ip 4.2 5.2 6.6 mADC voltage of pin 1 V1 2.50 2.55 2.60 VDC voltage of pin 3 V3 2.64 2.69 2.74 VDC voltage of pin 6 and 7 V6,7 2.38 2.44 2.50 VDC voltage of pin 8 V8 1.60 1.67 1.74 VDC voltage of pin 9,10 and 13 V9,10,13 2.42 2.47 2.52 VDC voltage of pin 11 and 12 V11,12 0.91 0.94 0.98 VDC voltage of pin 15 V15 2.06 2.12 2.18 VAF output current on pin 2 I2 45 60 80 µAOscillator current on pin 5 I5 275 375 500 µAAC ELECTRICAL CHARACTERISTICSTamb=25°C,Vp=3V,Firf=96MHz modulated with ∆f=±22.5kHz and fm=1kHz deviation;EMF=0.3mV(e.m.f. at asourse impedance of 75Ω),and measurement taken in fig.3 Unless otherwise specifiedParameter Symbol Test conditions Min Typ Max UnitVoAF=-3dB;VoAF=0dB atRF Sensitivityinput voltage Vi(rms)Vi=1mV;see Fig. 2Mute OFF 3 6 µVMute ON 3 6 12 µV(S+N)/N=26dB 5 10 µVSignal handlingTHD

SilanSemiconductors SC1088PIN DESCRIPTIONSPin No. Symbol Description Pin No. Symbol Description1 MUTE Mute output 9 ViIF IF input to limiter amplifier2 VOAFAudio frequency outputLow-pass capacitor of IF10 CLP2signallimiter amplifier3 LOOP AF loop filter 11 VIRF Radio frequency input4 Vp Supply voltage 12 VIRF Radio frequency input5 OSC Oscillator resonat circuit 13 CLIMLimiter offset voltagecapacitor6 IF FB IF feedback 14 GND Ground7 CLP1Low-pass capacitor of 1dBAll-pass filter capacitor.input15 CAPamplifierfor search tuning8 VOIFIF output to external couplingcapacitor(high-pass)16 TUNE Electrical tuning/AFC output20VOAF(dB)0-20-402211S+NNoise-60-8010 -6 10 -5 10 -4 10 -3 10 -21: Mute ON2: Mute OFFEMF (V)Fig. 2 Input sensitivityHANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD4

SilanSemiconductors TEST AND APPLICATION CIRCUITRs=75ΩSC1088220pF10kΩViRFEMF70nH16 15 14 13 12 11 10 9TUNEMUTECAPVOAF470pFGNDLOOP0.1µFSC108868pFCLIM VIRF VIRFVPOSCIF FB1 2 3 4 5 6 7 882pFCLP2CLP1330pFVIIFVOIF3,9nFMUTEDisable0.1µF1.8nF22kΩ22nF1.2kΩ78nH3.3nF180pF+3V18pFVOAF10nF27pFC1Fig. 3 Test circuit and application for mechanical tuning220pF10kΩViRF16 15 14 13 12 11 10 9TUNEMUTECAPVOAF470pFGNDLOOP0.1µF70nHSC108868pFCLIM VIRF VIRFVPOSCIF FB1 2 3 4 5 6 7 882pFCLP2CLP1330pFVIIFVOIF3.9nF+3V0.1µF1.8nF22kΩ22nF1.2kΩ18pF78nH3.3nF180pFVOAF10nF27pFC268nFC1D1V101Fig. 4 Application circuit with AFC for mechanical tuningHANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD5

SilanSemiconductors SC1088OscillatorresonatcircuitFM33pFAMFMAM8 7 6 5 4 3 2 19 10 11 12 13 14 15 1612pF4.7nF4.7nF 180pF22nF 47nF10kΩ33pF33pF470pF1µF+3V22µF10nF27kΩ12Ω5.1Ω22kΩ4.7nF2.7kΩBAW6210nF100kΩ1µF0.1µF330pFAMantennaearphoneVolumeLowHigh3.9nFAFTransformerUTC7642AM IFVPVOIF CLP1 IF FB OSC VPLOOP VOAF MUTESC1088VIIFCLP2VIRFVIRFCLIMGNDCAPTUNEAFAFFig.5 AM application circuitOFFBatteryswitchONAFAmplifierHANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD6

SilanSemiconductors PACKAGE OUTLINESOP-16-225-1.27SC1088UNIT:mm0.416.003.955.721.2710.209.801.95HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD7